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Anni [7]
3 years ago
8

How to find the energy of a wave

Physics
1 answer:
andreyandreev [35.5K]3 years ago
4 0
Ask my friend TheBrain.
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a 5.0 kg ball is dropped from a 2.5 m high window. what is the velocity of the ball just before it hits the ground?
julsineya [31]

Answer:

Approximately 7.0\; \rm m \cdot s^{-1}.

Assumption: the ball dropped with no initial velocity, and that the air resistance on this ball is negligible.

Explanation:

Assume the air resistance on the ball is negligible. Because of gravity, the ball should accelerate downwards at a constant g = 9.81 \; \rm m \cdot s^{-2} near the surface of the earth.

For an object that is accelerating constantly,

v^2 - u^2 = 2\, a \, x,

where

  • u is the initial velocity of the object,
  • v is the final velocity of the object.
  • a is its acceleration, and
  • x is its displacement.

In this case, x is the same as the change in the ball's height: x = 2.5\; \rm m. By assumption, this ball was dropped with no initial velocity. As a result, u = 0. Since the ball is accelerating due to gravity, a = 9.81\; \rm m \cdot s^{-2}.

v^2 - u^2 = 2\, g \cdot h.

In this case, v would be the velocity of the ball just before it hits the ground. Solve for

v^2 = 2\, a\, x + u^2.

\begin{aligned}v &= \sqrt{2\, a\, x + u^2} \\ &= \sqrt{2\times 9.81 \times 2.5 + 0} \\ &\approx 7.0\; \rm m\cdot s^{-1}\end{aligned}.

3 0
3 years ago
When selecting a material for a measuring temperature, we use what sort of properties?
ehidna [41]
<span>Temperature is measured via thermometer. It also measures the hotness or coldness of a system or surroundings. It is based on the physical and chemical properties of a fluid such as thermal expansion of fluids (fluids expand when heated and compress at a low temperature) by studying the kinetic energy of the molecules of the fluid.</span>
7 0
3 years ago
A winery has a vat with two pipes leading to it. the inlet pipe can fill the vat in 66 ?hours, while the outlet pipe can empty i
guapka [62]
The time taken to fill the vat can be found using the least common multiple [LCM]. Given that the first pipe fills the tank in 66 hours and the second one empty the tank in 1010 hours, the time taken to fill the tank will be:
LCM(66,1010)
=66*1010
=66,660 hours
the answer is:
66,660 hours

5 0
3 years ago
The period of a mechanical wave is 4 seconds. What is the frequency of the wave?
Artemon [7]

It is 0.25 waves second

8 0
3 years ago
Read 2 more answers
Atoms of an element contain only one type of atom because they each contain the same number of
stich3 [128]

Answer:

I believe it is B

Explanation:

3 0
4 years ago
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