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Aleonysh [2.5K]
3 years ago
11

Facts about cellphones

Engineering
2 answers:
alina1380 [7]3 years ago
6 0

Answer:

Your mobile phone has more computing power than the computers used for the Apollo 11 moon landing.

Mobile phones have to “work harder” to get a signal if you are in a moving vehicle.

The first mobile phone was made in 1973.

The first mobile phones that went on sale in 1983 cost nearly $4,000 each.

In 2012 Apple sold 340,000 phones per day.

4 out of 10 Brits admit to snooping on their partners phone.

Out of the 53% of snoopers that found incriminating evidence on their partner’s phone, 5% went on to terminate their relationship.

Waterproof mobile phones came to market because Japanese youngsters like to use them in the shower.

Apparently mobile phones have 18 times more bacteria on them than toilet handles!

Phubbing describes the act of snubbing someone by using your mobile phone in their company.

In 2015 more people died from taking selfies than shark attacks.

Teenagers that use a phone more than 2 hours a day increase their risk of depression and anxiety.

Nomobophobia is severe anxiety caused by the thought or act of losing your phone or running out of battery.

Explanation:

AlekseyPX3 years ago
4 0

Answer:

iPhone Sales in 2012

Can you believe that in 2012 Apple sold one phone every four seconds? That year they sold more than 340,000 iPhones per day. iPhone cell phones were coming off the shelves at a crazy rate.

Computing Power

Mobile cell phones have more computing power than the computers that were used for Apollo 11. If you were not aware the Apollo 11 was used to land on the moon. To think that our smartphones have more power than that spaceship is a bit mind-blowing.

First Smartphone

The first smartphone was introduced in 1993 at a Florida Wireless World Conference. The phone was designed by IBM and it was called Simon. IBM only made 2,000 Simon cell phones and they featured an LCD touch screen display that became the foundation for smartphones today.

First Cell Phone Price

The first cell phone was almost $4,000 when it was released in 1983. If you were to exchange that in today’s currency value it is about $9,000 USD. This is a much more expensive cell phone than our current iPhones and the technology cellphones had back then does not even come close.

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Answer:

The velocity of flow is 10.0 m/s.

Explanation:

We shall use Manning's equation to calculate the velocity of flow

Velocity of flow by manning's equation is given by

V=\frac{1}{n}R^{2/3}S^{1/2}

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We know that for an asphalt channel value of manning's roughness coefficient = 0.016

Applying values in the above equation we obtain velocity of flow as

V=\frac{1}{0.016}\times 3.404^{2/3}\times 0.005^{1/2}\\\\\therefore V=10.000m/s

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You are testing a new jet engine in a test cell at sea level conditions. You measure the mass flow through the engine and find i
bulgar [2K]

Answer:

43248 newtons.

Explanation:

Force = mass x accelerations and units of force are newtons which are given in the question.

here mass = 125 of air and 2.2 of fuel, total = 125+2.2=127.5kg/s  and the velocity of the exhaust is 340m/s.

force = 340m/s * 127.5kg/s = 43248 newtons technically this is wrong (observe units) but i will expalin how i have taken acceleration as a velocity here and mass/unit time as simply mass.

see force is mass times acceleration or deceleration, here our velocity is not changing therefore it is constant 340m/s but if it were to change and become 0 in one second then there would be -340m/s^2 (note the units ) of deceleration and there would be force associated with it and that force is what i have calculated here. similarly there would be mass in flow rate of mass per second, which is also in that one second of time.

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error = (actual-calculated)/actual. = (43248-60000)/43248= -38.734% less is ofcourse greater than 2%.

So the load cell is not reading correct to within 2% and it should read 43248newtons.

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