The human body has an energy efficiency of

A ball with a mass of 2.00 kg is dropped from a height of 10.0 m. 2kg 10 m How long will it take to hit the ground?

GREYUIT [131]

1.4s.....................

5 0

2 years ago

engineers who design battery operated devices suck as sell phones and MP3 players try to make them as efficient as possible. An

ICE Princess25 [194]

If the 5,500 J of sound and light is the ONLY useful output
from the phone, then the phone's efficiency is

(5,500J / 10,000J) = 0.55 = 55% .

But the test engineer forgot one little minor almost insignificant detail.
As a test engineer myself, I'd say that he needs to turn in his laptop
and soldering iron, and think about changing his career to a job for
which he may be better suited, like 8 hours a day in a highway toll-booth.

What about that little radio transmitter and receiver inside the phone,
that maintain digital RF communication with the nearest cell tower ?
Without that microscopic radio transceiver ... plus 30 or 40 apps
that are always running unless you shut them off ... the device in your
pocket is essentially a flat rock with one side that sometimes glows.

8 0

3 years ago

Sleep is a difficult problem for dolphins because dolphins __________. A. need more sleep than their predators B. must be awake

Alex17521 [72]

Need more sleep than their predators

5 0

3 years ago

Read 2 more answers

A garden hose with a diameter of 0.64 in has water flowing in it with a speed of 0.46 m/s and a pressure of 1.9 atmospheres. At

STALIN [3.7K]

Answer:

(a).The speed of the water in the nozzle is 3.014 m/s.