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Of all of the new “Magic” devices in Apple’s lineup, perhaps no device is more deserving of the moniker than the Magic Trackpad 2. It’s the only device, out of the three new peripherals that Apple recently launched, that truly brings new functionality to the table.

While the Magic Mouse 2 and the Magic Keyboard are legitimate upgrades over the products they replace, the Magic Trackpad 2 is the most justifiable upgrade from a pure features standpoint, and Apple’s pricing for it says as much.

At $129.00, this isn’t exactly a knee-jerk purchase to be made on a whim. And if you already own the old Magic Trackpad, an impulse buy is lessened even more.

I’ve been testing out the new Magic Trackpad 2 for several days now, and it’s taken me a while to put my thoughts down in writing. This device takes significantly more time to get to know than either the Magic Mouse 2 or the Magic Keyboard. That’s because the Magic Trackpad offers the most diverse functionality of the trio.

With all of that said, is the Magic Trackpad 2 worth upgrading to if you already own the previous Magic Trackpad? Watch our video review, and read my full analysis for the details.

As I’ve echoed in my other two Magic-device reviews, if you’re simply looking to get away from having to replace or swap out batteries, then the Magic Trackpad 2 is a no-brainer upgrade. Like the keyboard and the mouse, the Magic Trackpad 2 comes with a built in battery, and a Lightning cable for recharging said battery.

Design-wise, the Magic Trackpad 2 is significantly different than the original Magic Trackpad. It features a lower profile, 29% more surface area for multi-touch gestures, and a wider stance. It’s a much more sleek and unassuming design than the outgoing trackpad, and matches the design language of the new Magic Keyboard.

Use preferences to configure the Magic Trackpad 2 to your liking

And that brings me to this juncture of the review—is Force Touch a game changer? On the iPhone, the comparative 3D Touch seems more like a game changing feature that’s reason enough alone to consider buying the hardware. That’s mainly because the sense of touch is enhanced because you’re directly manipulating things on the screen. With the Magic Trackpad 2, Force Touch seems a bit disconnected, and rightfully so—you’re not actually touching an item on screen, you’re touching a trackpad.

I’ve also found that while the shortcuts that Force Touch makes possible are certainly nice, they won’t fundamentally change my workflow. The Mac has so many input options and customization options already, that it doesn’t feel like nearly as big of a shortcut as the comparative feature does on iOS. I don’t want to downplay the coolness of Force Touch, and the technology that makes it all possible, but I don’t feel that it’s reason enough alone to drop $130 on a trackpad, especially if you already own the original Magic Trackpad.

Collectively, however, it all adds up to an appealing package. When you consider that the device has way more surface area for gestures, features a much more appealing design, a rechargeable battery, and sports Force Touch, it becomes a tougher judgement call. For many, the most appealing thing about the upgrade is the inclusion of the rechargeable battery. As I’ve stated before, that alone is enough to make it worth strongly considering an upgrade.

If the Magic Trackpad 2 was the same price, or even $10-$30 more expensive than the device it replaces, I’d say upgrade without hesitation. But this device is almost double the price of the outgoing model, and that makes the decision a lot tougher. Just know that you’re in no way getting a revolutionary device if you decide to jump in. You’re getting a much-improved device, though, and for many of you, that may be all it takes to convince you to pull the trigger.

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Kindle Touch Review: Finally, A Touch E

Though the Kindle Touch brings Amazon up to speed with other e-readers, its hardware and software offer little in the way of imagination and useful innovation.

The Kindle Touch (Wi-Fi + 3G) is the flagship of Amazon’s Kindle e-reader line. The addition of touch navigation aligns Amazon’s Kindle with its competition, but a few debatable interface and physical design choices reduce my enthusiasm for this product. Still, if you want a connected-anywhere dedicated e-reader, the Kindle Touch (Wi-Fi + 3G) is the way to go; no other e-reader maker currently offers a 3G version.

Touch Design

The Kindle Touch’s touch design differs significantly from most that of most rival e-readers. The top inch-plus of the 6-inch display is reserved for accessing the menu and toolbar with a single tap. Below that, Amazon has divided the screen into regions: A 0.5-inch-wide strip running the length of the left-hand side is set aside for tapping to return to the previous page. The larger region to the right–effectively stretching from the center of the page to the right edge–is reserved for moving to the next page.

A more critical problem is the e-reader’s lackluster in-book navigation. You first tap Go To, and then select from cover, beginning, end, or page/location. There’s no visual slider, and you can’t see where you are at glance—two features that both Barnes & Noble’s Nook Simple Touch and Kobo’s eReader Touch Edition offer.

By contrast (and disappointingly), the sparse-looking home screen hasn’t changed much for several product generations now. You can sort by most recent, by title, by author, or by collection, but the e-reader presents those views entirely in text. The Kindle Touch isn’t set up to show your books visually, as Nook Simple Touch, the Kobo eReader Touch, and even the Sony Reader Wi-Fi PRS-T1 do. Also, Amazon continues to hide its Web browser under the ‘experimental’ section, along with the text-to-speech feature; the browser has been in place since the original Kindle launched in 2007, while the text-to-speech debuted on the Kindle 2.

The Kindle Touch lets you choose from eight font sizes, including one of the largest I’ve seen on any e-reader. You can adjust line spacing and words per line, too, but here Amazon gives you only three options. The same goes for the typeface—you can opt for the default font, or for condensed or sans serif type. In contrast, the Nook Simple Touch offers you six fonts choices, and both the Kobo Touch eReader and the Sony Reader Wi-Fi make seven fonts available. The screen doesn’t rotate, either, unlike the screen on the basic, nontouch Kindle.

Physical Design

The Kindle Touch’s 6-inch display has a 600-by-800-pixel resolution, at 167 pixels per inch. Text looked a bit fainter on this model than on the updated Nook Simple Touch, the Kobo eReader Touch, or the Sony Reader Wi-Fi. It comes with 4GB of memory, which Amazon says can accommodate up to 3000 books.

The new model’s silver gray bezel was easy to scratch and did nothing to help the contrast pop on the E Ink display. The Nook Simple Touch has a charcoal-black bezel, while the Kobo and Sony e-readers have a pitch-black bezel. Another design oddity: The ridged design of the home button on the front of the device seemed out of place on a stylish and simple e-reader.

Along the bottom edge are micro-USB and headphone ports, plus a power/sleep/wake button. The only way to wake the device is via the power button.

New with the Kindle Touch and its nontouch sibling is the ability to share books via the public library system.

Imo Monster 10″ Touch Usb Monitor Review

iMo Monster 10″ Touch USB Monitor Review

Nanovision’s MIMO range of USB companion displays are no strangers to the pages of SlashGear, and we’ve reviewed our fair share of them over the months. Standing proudly on the test bench today, though, is the company’s biggest to date, the 10-inch touchscreen iMo Mini-Monster. A titan among USB secondary displays (and a Tinkerbell among regular LCDs), the iMo Mini-Monster promises the same ease of connectivity as its smaller siblings but with the same resolution as a 10-inch netbook. Worth the $259.99, then, or has Nanovision overestimated exactly what consumers want from their companion LCDs? Check out the full SlashGear review after the cut.

Physically the iMo Mini-Monster looks a little like a basic tablet, with minimal screen bezel surrounding the 10-inch, 1024 x 600 touchscreen display. On the back there’s a hinged stand that flaps out to prop the screen up, while the ports are recessed at the side. Nanovision quote a 400:1 contrast ratio and 350cd/m2 brightness, and the whole thing measures 9.7 x 6.3 x 1 inches and weigh 1.77lbs.

As with the other MIMO displays we’ve tested, the iMo Mini-Monster relies on DisplayLink’s virtual graphics driver technology. Rather than plugging into a true video output – such as a VGA port or HDMI – the DisplayLink drivers create a virtual monitor connection and the Mini-Monster gets both power and signal over the same USB 2.0 connection. The plus side is that you don’t need another graphics card (or to use your spare video output on a sub-display); the negative is the CPU impact of doing the necessary graphics crunching.

On a desktop PC or a decent notebook, running a single MIMO display isn’t going to bring your system to a halt. However, because you can have several such displays going at the same time, each with their own virtual graphics driver, it’s possible to bring general performance noticeably down. If you’re on a low powered machine to start with, such as a netbook, the impact of the DisplayLink drivers will be even more considerable.

You’ll also need a USB port with sufficient power to drive the display. A double-headed USB cable (two full sized USB plugs on one end, a mini-USB plug on the other) is supplied just in case a single port isn’t enough. There are also two USB ports on the iMo Mini-Monster itself, to use it as a simple hub; Nanovision throw an AC adapter into the box to power these extra sockets. Otherwise the only feature of note is the pull-out stylus for more precise use of the touchscreen.

That touchscreen, meanwhile, is a resistive panel rather than a capacitive one, supporting a single point of contact rather than multitouch. Unlike some of Nanovision’s smaller MIMO displays, the OS X touchscreen driver (for Intel based Macs only) is freely available alongside its Windows counterpart; previous displays from the company used a proprietary OS X touchscreen driver that added a further $30 to the bill. Accuracy is reasonable but of course lacks pressure sensitivity; this isn’t the display for an artist, unless you’re content sketching out the most basic of lines.

The Mini-Monster is billed as suitable for both desktop or handheld tablet-style use, though since there’s no accelerometer or physical rotation button you’ll need to dig into the DisplayLink settings in order to flip the screen orientation around. As with other MIMO screens, it comes into its own with Photoshop toolbars, IM windows, Twitter apps and music playback controls: the things you’d like to have constant access to, but don’t want to pin on top of your regular work area. Unlike other models there’s no integrated webcam, speakers or microphone.

It all works as you’d expect, then, and while we’d prefer a more flexible stand (or, indeed, a VESA mount) it’s a relatively straightforward way to get extra display real-estate. Our concern, then, regards the price. At $259.99, you could certainly get a regular LCD display that’s considerably larger than the iMo Mini-Monster, or indeed a netbook with the same screen size and resolution. Now, neither of those would have the touchscreen layer, but you could easily use the netbook as a secondary display with an app like MaxiVista ($39.95).

If the touchscreen is a dealbreaker, though, and the compact dimensions of the iMo Mini-Monster a boon rather than a drawback – admittedly we’d rather not carry a full-sized LCD in our laptop bag, whereas the MIMO slots in nicely – then adding another 10-inches of screen has never been so easy. Most users will be satisfied with the regular 7-inch MIMOs – kicking off at $179.99 for a touchscreen model – but if you demand the biggest of the small screens then the MIMO iMo Mini-Monster fits the bill.

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Xiaomi Redmi Note 2 Review

Xiaomi’s Redmi range of phones really received a serious boost when the Xiaomi Redmi Note 2 was announced. This was a phone with which offered all the benefits of a Redmi phone, but with hardware on par with some flagships.

Xiaomi Redmi Note 2 Review – Design

After the rather bland and bulky design of the original Redmi Note, Xiaomi have really done a great job of the Redmi Note 2. The Note 2 offers the same size 5.5-inch display, but in a more compact and thinner body than before.

Being narrower in both the overall thickness and width of the original Redmi Note helps the Xiaomi Redmi Note 2 feel much more at home in your hand. With the addition of a soft to the touch rear, and much rounder edges the phone is a joy to hold.

Construction is sill based around a plastic covered main chassis with removable rear panel (available only in white at this time), but it remains solid and feels lightweight. A benefit of a plastic build over metal is also the cost. Plastic is cheaper meaning more exciting hardware features can be thrown in at a lower price, but also plastic has a higher yield rate at the factory meaning fewer quality issues and a faster turn around time, further reducing costs.

Xiaomi like to launch the white versions of their phones first. With a black front and white rear the Xiaomi Redmi Note 2 has a ‘Panda’ look to it. There is a splash of colour on the front of the device where the hardware navigation buttons get red icons and are backlit with a red LED too.

A standard USB port is located in the base next to a microphone. The entire left side of the phone is blank and the power button and volume rocker are found on the right (the same as every Xiaomi phone to date). Up top, Xiaomi have placed a 3.5mm headphone jack and even found room in the budget for an IR blaster. Personally I never use the IR control on any phone, so it is of little benefit to me, but some users find it a great benefit to have.

The rear of the Xiaomi Redmi Note 2 looks like the Mi2 from years back only larger. There is a large lens with 13 mega-pixel PDAF camera behind, single LED flash, Mi logo and large speaker area (similar in design to the Xiaomi Mi4i and Mi4c).

Like all Redmi phones the rear panel is removable so you can replace to backs with other colour options, but on a more useful note it also gives you access to the removable 3020mAh battery, dual SIM slots and Micro SD card tray.

Xiaomi Redmi Note 2 Review – Display

In addition to the new design, the Xiaomi Redmi Note 2 also sees a boost in screen resolution. The display is the same 5.5-inch across but it now has a 1920 x 1080 FHD resolution and PPI of 401. Compared to the original Redmi Note this is a great improvement. Text is clearer, and images are more crisp.

MIUI has the option to change the ‘temperature’ of the ROM to give you a cooler or warmer feel, but I was left wanting in the overall vibrancy of the screen. That’s not to say the screen on the Redmi Note 2 is bad, but just that I have seen more visually appealing screens on similar priced phones.

Touch response and accuracy are fine on my test unit, but I did notice that the lower portion of the display has a slight yellow tinge to it. I’d like to point out that I didn’t notice this myself and had to visually search for the issue after a reader told me other Redmi Note 2 owners had mentioned it. The yellowing isn’t on the same scale as it was on the OPO, and you would really have to take a good long look to notice. For me it’s a none issue.

Xiaomi Redmi Note 2 Review – Hardware

Xiaomi managed to find enough money in their budget to really give the Xiaomi Redmi Note 2 an impressive hardware overhaul, and really went to town under the hood. The big news is the inclusion of a 2.0Ghz Mediatek MT6795 Helio X10 Chipset (the Redmi Note 2 Prime as a 2.2Ghz chipset). This is a similar SoC to the Meizu MX5 and the LeTV Le1, and is a proven performer.

RAM on both versions of the Xiaomi Redmi Note 2 remains at 2GB, but internal storage leaps to 32GB on the prime from 16GB on the standard Redmi note 2. Personally if I was to use my own money to buy the Xiaomi Redmi Note 2 I would choose the standard 2.0Ghz model and buy a large SD card as I am not sure the extra 0.2Ghz of CPU is going to make a whole world of difference to the phone.

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The Helio X10 chip has support for LTE bands, but it’s not compatible with all networks. If you are in the U.S then the phone isn’t going to work with all providers, and you aren’t going to get LTE speed data. European buyers are going to have better luck with LTE. I recommend checking with your network provider to ensure the Redmi note 2 is compatible before buying (4G FDD-LTE 1800/2100/2600MHz, TDD-LTE 2600/1900/2300/2500MHz, 3G: WCDMA 850/900/1900/ 2100MHz, 2G: GSM 850/900/1900MHz)

Another area where Xiaomi have boosted the parameters of the Redmi note 2 is the cameras. The front camera is a 5 mega-pixel shooter with wide-angle lens and beautification features, while the rear is a Samsung 13 mega-pixel sensor with Phase Detection Auto Focus. On paper this sounds really impressive, but the results (see below) are about average for a phone of this price.

Xiaomi Redmi Note 2 Review – Performance

If you remember what hardware the original Redmi Note had then you should have some idea of how the new Xiaomi Redmi Note 2 performs. With either 2.0Ghz or 2.2Ghz of power plus 2GB RAM on tap the Redmi Note 2 runs everyday tasks without issue. Day to day performance is fantastic, even multi-tasking runs well with (just) 2GB RAM available.

Now and then the Redmi Note 2 can struggle during gaming. There will be a slight slow down or the odd jerk or jump. It’s not a regular occuring issue but then again I’m not a heavy gamer. What is more of a concern is the heat. Gaming, or anything else which requires putting the SoC under load generates a lot of heat.

Those odd jerks and jumps in gaming and the unacceptable heat are issues we hope the upcoming MIUI 7 ROM are going to address.

Xiaomi Redmi Note 2 Review – Battery

I like that Xiaomi retained the removable battery design on the Xiaomi Redmi Note 2. It means that you an carry a spare with you, and it also opens the possiblity of a longer service time. It’s also good to see a large 3020mAh battery included in the phone.

As with the gaming performance and heat, I am hoping that battery performance can be improved with MIUI 7. As it is, you can get the Xiaomi Redmi Note 2 to last a full day of average use, with a screen on time of around 4 hours.

Is this good? Well it depends what you were expecting and what you are currenlty use to. I was hoping for longer, but not being a heavy gamer I can make this battery life work. Still, I hope MIUI 7 can bring better optimisation and squeeze a longer screen on time out of the tank.

Xiaomi Redmi Note 2 Review – Camera

To hear the Xiaomi Redmi Note 2 came with an updated 13 mega-pixel PDAF rear camera was a real ‘wow’ moment for me and I was eager to give it a go. Perhaps my excitement and high expectations are the reason why I’m not all that impressed with the camera performance though.

With PDAF I was expecting a fast auto focus, and while it is faster than the original Redmi Note, it isn’t fast enough to notice a huge benefit. Actual image quality was average for a mid-range phone. I would say that Meizu have done a better job with camera optimisation, and the the LeTV Le1 is leagues ahead of the Redmi Note 2.

Below are a few Xiaomi Redmi Note 2 photo samples.

Xiaomi Redmi Note 2 Gallery Xiaomi Redmi Note 2 Specifications

Specification

Model: Redmi Note2

Sim Card:

Dual SIM Card Dual Standby

Color: Front White

Capacity RAM: 2GB RAM

ROM: 16GB ROM

Multi-Languages English, Simplified Chinese

Chipset Others: Quad-core 2.0 GHz Octa-core 64-bit, A53

System MIUI 7

Screen Display Size: 5.5 Inch

Type: IPS LCD, capacitive touch screen

Resolution: 1920 x 1080 pixels

Screen Color: 16000K Colors

Multitouch: Yes

Technology:312 ppi pixel density,OGS

Camera Rear Camera: 13 MP, 4208 x 3120 pixels, autofocus, LED flash

Front Camera: 5MP

Features: geo-tagging, touch focus, face and smile detection, HDR

Video Capture:1080p@30fps, 720p@30fps

Network and Wireless Connectivity 4G FDD-LTE B1B3/B7(1800/2100/2600MHz) ,

TDD-LTE B38/B39/B40/B41(2600/1900/2300/2500MHz)

3G: WCDMA 850/900/1900/ 2100MHz

2G: GSM 850/900/1900MHz

Data Technology: GPRS/EDGE/DC-HSPA+(42Mbps)

GPS: GPS + AGPS + GLONASS + BDS

Bluetooth: BT4.0LE

infrared

WiFi: 802.11 a/b/g/n/ac, Wi-Fi hotspot,Dual-And, Wi-Fi Direct

OTG:Yes

Battery capacity and life

3020mAh lithium-ion battery

Sensor Gyro, Light, Gravity, Proximity, Compass

Size Dimensions:152 x 76 x 8.25 mm

Net Weight: 160 g

Xiaomi Redmi Note 2 Review – Conclusion

It goes without saying that the Xiaomi Redmi Note 2 is a huge upgrade over the original Redmi Note. Xiaomi have managed to give the Redmi Note 2 a much more pleasing design, powerful Helio X10 processor, PDAF rear camera, higher resolution display and some neat features like dual SIM and an IR remote.

But a lot has changed in the Chinese smartphone world since the original Xiaomi Redmi Note launched and the Redmi Note 2 only addresses some of that change. The design and hardware are a huge improvement, but the user experience and performance (camera, gaming battery performance) are all below expectations. Just as the Mi4i looked killer on paper and failed to impress due to poor optimisation, the Redmi Note 2 also falls behind the competition.

There is still potential for the phone. With an update to Xiaomi’s latest MIUI 7 we could see better gaming performance, better image processing and longer battery life, but then again we might not.

Difference Between Gravitational Force And Electrostatic Force

Force is a physical quantity which is defined as a pull or push of a body having certain mass. Force is the factor that causes a change in the velocity of a body. Basically, a force is an external agent causes the change in the state of an object, i.e., it may move the object or may stop the movement of moving body.

Force is a vector quantity. Thus, it has both magnitude and direction. Force may be classified into two broad categories namely contact force and non-contact force.

Contact force is the one that acts on a body by making a direct contact with the body.

Non-contact force is the one that acts on the body through space without having direct contact with the body.

A generalized formula of force is given by the Newton’s second law of motion, which is,

$$F:=:ma$$

$$F:=:ma$$

Where, ‘F’ is force, ‘m’ is the mass of body, and ‘a’ is acceleration (change in velocity of body due to force). The SI unit of force is Newton (N).

This article is meant for explaining the differences between gravitational force and electrostatic force. Where, both gravitational and electrostatic forces are the types of noncontact forces. Before, going to discuss the differences, we learn the basics of gravitational force and electrostatic force so it becomes easy to understand the differences between them.

What is Gravitational Force?

The force of attraction exerted by an object on another objects due to their mass is called the gravitational force. If out of two, one body is the earth, then it is called gravity. The gravitational force can be only an attraction force, it can never be repulsive. Though, the gravitational force is a non-contact force. Therefore, for the existence of gravitational force between two bodies, the direct contact between the bodies is not required.

If there are two bodies having masses M1 and M2 respectively and are separated by a distance of R meters, then the gravitational force is given by

$$F:alpha:frac{M_1M_2}{R^2}$$ $$Rightarrow:F:=:Gfrac{M_1M_2}{R^2}$$

$$F:alpha:frac{M_1M_2}{R^2}$$ $$Rightarrow:F:=:Gfrac{M_1M_2}{R^2}$$

Where, G is the constant of proportionality, called gravitational constant. In SI units, the value of G is −

$$G:=:6.67:times:10^{-11}Nm^2kg^{-2}$$

Numerical Example 1

$$G:=:6.67:times:10^{-11}Nm^2kg^{-2}$$

Two bodies having masses 500 kg and 700 kg are separated by a distance of 200 meters. Calculate the force of attraction between the bodies.

Solution

Given data,

Mass of body 1, $M_1$ = 500 kg

Mass of body 2, $M_2$ = 700 kg

Distance between bodies,$R$= 200 m

Therefore, according to the Law of Gravitational Force, we get,

$$F:=:Gfrac{M_1M_2}{R^2}$$ $$Rightarrow :F:=:frac{(6.67:times:10^{-11})times:500times:700}{200^{2}}$$ $$F:=:5.84:times:10^{-10}N$$

$$F:=:Gfrac{M_1M_2}{R^2}$$ $$Rightarrow :F:=:frac{(6.67:times:10^{-11})times:500times:700}{200^{2}}$$ $$F:=:5.84:times:10^{-10}N$$

Thus, the force of attraction between the given bodies is of 5.84 × 10−10 N.

What is Electrostatic Force?

A force that acts between two bodies due to their electric charges is called electrostatic force. Therefore, the electrostatic force is the one that a charged body exerts on another charged body. Just like the gravitational force, the electrostatic force is also a non-contact and hence do not require direct contact between bodies for their existence.

Unlike the gravitational force, the electrostatic force may be an attractive force or a repulsive force. It is an attractive force, if the two charged bodies carry different charges, like one carries positive charge and another carries negative charge. On the other hand, if both charged bodies carry same charge, i.e. positive-positive or negative-negative, then the electrostatic force acting between them is of repulsive nature.

The electrostatic force is formulated by the Coulomb’s Law as,

$$F:=:kfrac{Q_1:Q_2}{r^2}$$

$$F:=:kfrac{Q_1:Q_2}{r^2}$$

Where, k is constant of proportionality, Q1 and Q2 are the charges on bodies, r is the distance between two charged bodies. The value of k is given by,

$$k:=:frac{1}{4piepsilon_0epsilon_r}$$

$$k:=:frac{1}{4piepsilon_0epsilon_r}$$

Where,$epsilon_0$ and $epsilon_r$are the permittivity of vacuum and relative permittivity of medium respectively.

$$epsilon_0:=:8.85:times:10^{-12}:Fm^{-1}$$

$$epsilon_0:=:8.85:times:10^{-12}:Fm^{-1}$$

The following example illustrates the process of determining the electrostatic force acting between two charged bodies.

Numerical Example 2

Two charged bodies carrying electric charge of +5 C and -10 C and are separated from each other by a distance of 10 meters in free space. Determine the electrostatic force acting between them.

Solution

Given data,

$Q_1$ = +5 C and $Q_2$ = −10 C

r = 10 m

Therefore, according to coulomb’s law of electrostatics, we get,

$$F:=:kfrac{Q_1:Q_2}{r^2}$$ $$Rightarrow :F:=:frac{(9:times:10^{9})times:5times:10}{10^{2}}$$ $$therefore:F:=:4.5:times:10^9:N$$

$$F:=:kfrac{Q_1:Q_2}{r^2}$$ $$Rightarrow :F:=:frac{(9:times:10^{9})times:5times:10}{10^{2}}$$ $$therefore:F:=:4.5:times:10^9:N$$

Hence, the electrostatic force between the two bodies is 4.5 × 109 N and it is an attractive force because the charges on the bodies are opposite

Difference between Gravitational Force and Electrostatic Force

Gravitational force and electrostatic force are both non-contact forces. However, there are several major differences between gravitational force and electrostatic force, the following table highlights all those differences:

Basis of Difference Gravitational Force Electrostatic Force

Definition A force of attraction that a body exerts on another body due to their mass is called gravitational force. A force of either attraction or repulsion that a body exerts on another body due to their charge is called electrostatic force.

Cause of existence Gravitational force is only due to mass of the body. Electrostatic force is exists due to charge on the body.

Nature of force Gravitational force is only an attractive force. Electrostatic force may be an attractive force or a repulsive force.

Effect of surrounding medium The gravitational force is not affected by the medium in which the two bodies are placed. Electrostatic force depends on the medium in which the bodies are placed.

Expression The gravitational force is given by, $$F:=:Gfrac{M_1:M_2}{R^2}$$ The electrostatic force is given by, $$F:=:kfrac{Q_1:Q_2}{r^2}$$

Constant of proportionality The gravitational constant (G) (which is the constant of proportionality) has a value that is constant at any point in this universe. It is, $$G:=:6.674:times:mathrm{10^{-11}Nm^2kg^{-2}}$$ In case of electrostatic force, the constant of proportionality is ‘k’ whose value depends on the medium.

The value of k in free space is, $$k:=mathrm{:8.85:times:10^{-12}Fm^{-1}}$$

Strength The gravitational force is comparatively a weak force. The electrostatic force is stronger than gravitational force.

Importance

The following are facts that show the importance of gravitational force −

It is responsible for rotation of the earth around the sun.

It is responsible for rotation of the moon around the earth.

It is responsible for formation of tides in the oceans, etc.

The electrostatic force is important because it enables us to find the electric force experienced by a charge due to another charge (or charges).

It also enables us to find the electric field intensity at a place.

Applications The gravitational force is used to calculate the time period of modern artificial satellites, prediction about lunar and solar eclipses, etc. Electrostatic force is used in laser and inkjet printers, Xerox machine, electrostatic air filter, etc.

Conclusion

From the above discussion, we can conclude that gravitational and electrostatic forces are different in many aspects, but both are types of non-contact forces, which means they do not need a direct contact between two bodies for their existence.

Cubot Cheetah 2 Review: New Mid

With this in mind let’s have a deep look at the Cubot Cheetah 2, whose slogan is “Running like the cheetah, Noble like the cheetah”, whatever that means!

Cubot Cheetah 2 Specifications

Processor MediaTek MT6753 Octacore

Display 5.5″ 1920 x 1080 px, IPS LCD

RAM 3GB

Storage 32GB

Operating System Android 6.0 Marshmallow

Cameras 13MP (16MP interpolated) Rear, 8MP (13MP interpolated) Front Camera

Battery 3000mAh

Physical Properties 193g, 153 x 75 x 8.5 mm

Cubot Cheetah 2 Packaging

Packaging is pretty straight forward like other Cubot phones; you find the phone accompanied by a thick silicon case which appears to be able to save your phone from almost any kind of fall. Luckily I haven’t had the honor of testing that yet. Inside the box you also find a 5V – 1A charger and a USB Type C cable.

There are no instruction manuals or any kind paper crap, which is probably better for the environment.

Cubot Cheetah 2 Review Design & Build

If I compare if to my current daily driver (which is a Xiaomi Redmi Note 3), it feels a bit more premium. Iit has narrower bezels and although it’s mostly made of plastic, still feels more solid than the Note 3, probably due to the thick metal frame.

On the negative side, as I mentioned earlier, the phone is really heavy. It weighs 195 grams (personally measured) and that’s on the brink of being too much. It also feels a bit like the center of gravity is slightly at the top of the phone, which makes it harder to handle. And I have big hands, can’t imagine how it’ll be for people with smaller ones.

The Cubot Cheetah also has a removable back cover so you can swap batteries. Oh wait, no you can’t! I’m not hating on it for that though, I still prefer to swap SIM or microSD card this way instead of looking for the SIM removal tool, which is a pain every time.

The rear camera protrudes a bit from the back, so it’s prone to scratches if you aren’t using a case. On the front of the phone we find two capacitive buttons (non backlit) and a physical home button with a fingerprint scanner. The home button is a bit hard to press but it doesn’t feel cheap, same goes for the volume rocker and power ON/OFF button.

Display

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The display on the Cubot Cheetah 2 is pretty amazing, it’s really bright and clear. Colors appear to be accurate and it’s perfectly visible under direct sun light as well, unlike other smartphones I own.

I’m not quite sure if it’s the display itself or the screen protector it comes with, but since that’s how you’ll get it in the box, then I must say this is one of the best screens I’ve seen on a smartphone, you sure won’t be disappointed.

Hardware & Performance

The Cubot Cheetah 2 comes with a MediaTek MT6753 CPU, 3GB of RAM and 32GB of internal storage, as any smartphone in that price-range should. The octa-core CPU itself is a bit disappointing as it falls behind the more powerful MediaTek Helio X10 (or Helio P10) which isn’t that much more expensive.

Does that interfere with the phone’s performance in any way though? Not really in daily use, in my opinion. I’m not a big smartphone gamer, I use my phone mostly for social media, Facebook, Twitter and other IM apps. I rarely ever play games and if I do it’s mostly light games, thus I don’t need a really powerful CPU/GPU for that kind of stuff.

Overall the user experience is really smooth, apps open quickly and without any stutters, with 3GB of RAM multitasking is also not a problem, I can leave apps open in the background and find them in the right place after a while. I’m very satisfied in this regard.

If you care about the bare numbers, the phone scored 37553 on AnTuTu and 607 on GeekBench for single-core, 2424 for multi-core.

4G connectivity is really good, it supports band 20, which is really important over here in Europe, so I get LTE almost anywhere. Also call quality is above average and that’s not always granted with these cheaper phones.

The GPS signal is rather strong, it gets a fix pretty fast and there’s a compass as well, which makes it work great with Google Maps and other navigational apps.

The Cheetah 2 can accomodate one Micro SIM, one Nano SIM and a microSD card (up to 128GB). I would have preferred it had two Micro SIM slots but that’s a “me problem”.

Battery life on the Cubot Cheetah 2 is “OK”, used to the 4000mAh on the Redmi Note 3, 3000mAh feel a bit tight but they’re still enough to get you through the day. What I think is a slightly bigger problem is the charging speed, it gets only up to 5V – 1A, which is relatively slow nowadays. Even if you use higher wattage chargers, the phone still limits it to 5V – 1A, probably good for safety, not that much for saving time.

The fingerprint scanner is accurate and I’d give it a ~95% success rate, I also like the fact that you don’t have to fully press the home button to unlock the phone, simply laying a finger on it will do the job.

Cubot Cheetah 2 Camera & Photos

The only real problem with the camera is lens flare, while that might look good on some kind of artistic photos, it’s not something you want when you’re shooting group photos or whatever else. Sadly this can’t be fixed in software so you’ll have to live with that.

Dynamic range is not amazing, but I wouldn’t expect it to be on a mid-range phone. The front facing camera is also alright and it’ll do the job.

Either way, here you can have a look for yourself at some photos I shot:

Cubot Cheetah 2 Gallery Cubot Cheetah 2 Review

Conclusion

Coming with 3GB of RAM, 32GB of internal storage and a $140+ price tag, the Cubot Cheetah 2 falls in the mid-range category which is now over-populated with dozens of fearless competitors. One of which is the Xiaomi Redmi 3, that packs a more powerful CPU, bigger battery and sells at around the same price.

So, why should you buy this phone you may ask? I honestly don’t have a definitive answer but it doesn’t mean this phone is worthless. I would consider getting this phone for the amazing display (the Redmi Note 3 is far behind), a relatively good camera (also compared to the Note 3) and the presence of USB Type C, not yet available on most phones.

There’s also the home fingerprint scanner “front vs rear” argument, but that’s up to personal choice. Although I must say it really comes in handy when you place your phone on a desk/table and you can unlock it by simply laying a finger on it; a real time saver.

Overall it’s a good phone for the price that does what it promises, nothing less, nothing more. You can learn more about the phone on the official site, or buy one here.

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