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Do you think energy can be “used up?” Why or why not?

My name is Ann [436]

I dint think energy can be used up because energy cant be created nor destroyed

8 0

3 years ago

Is a bath tub renewable or not?

Irina18 [472]

The water being poured into the bathtub is renewable and can be recycled, filtered, and renewed. But, metaphorically, each time you use electricity you drain a little water from the "bathtub" or the electric grid.

6 0

3 years ago

Read 2 more answers

Suppose that a car performs a uniform acceleration of 0.42 m/s from rest to 30.0 km/h in the first stage of its motion (From poi

kifflom [539]

Answer:

a)Total distance = 399. 5 m

b)Total time =51.51 sec

c)Average speed = 7.75 m/s

Explanation:

For A to B:

$S=ut+\dfrac{1}{2}at^2$

$v^2=u^2+2as$

v= u + at

8.33 = 0.42 x t

t=19.83 sec

1 Km/h=0.27 m/s

30 Km/h=8.33 m/s

$8.33^2=2\times 0.42\times s$

s=82.6 m

For B to C

V= 8.33 m/s

s= V x t

s=8.33 x 30

s=249.9 m

For C to D

$S=ut-\dfrac{1}{2}at^2$

v= u - at

Final speed v=0

So

s=v x t/2

7= 8.33 x t/2

t=1.68 sec

Total distance = 82.6 + 249 .9 +7

Total distance = 399. 5 m

Total time = 19.83 + 30 + 1.68

Total time =51.51 sec

Average speed =Total distance/Total time

Average speed = 399.5/51.5

Average speed = 7.75 m/s

6 0

3 years ago

"A 2000 kg car drives around a circular exit ramp with a radius of 30 meters. The car drives all the way around the ramp in 10 s

aev [14]

The speed of the car is 18.8 m/s

Explanation:

The variables that represent the givens are:

m = 2000 kg (mass of the car)

r = 30 m (radius of the curve)

t = 10 s (time elapsed to cover the curve)

The unknown is the speed of the car, which is given by:

$v=\frac{d}{t}$

where d is the distance covered by the car during the time t.

Here the car covers a circular trajectory of radius r, so the distance covered is

$d=2\pi r=2\pi(30)=188m$

Therefore, the speed of the car is

$v=\frac{188}{10}=18.8 m/s$

Learn more about circular motion:

brainly.com/question/2562955

brainly.com/question/6372960

#LearnwithBrainly

8 0

3 years ago

What must a mechanical wave travel through

konstantin123 [22]

A mechanical wave always consists of wiggles in some kind of material stuff. The material stuff may be air, water, rock, wood, steel ... almost anything, as long as it's some material. In general, whatever the waves are moving through is called the "medium". If there isn't any, like the vacuum in space, then mechanical waves can't travel there. For example, sound can't travel in space ... not even an inch.

5 0

3 years ago