3 years ago

Why does sound energy even exist

Physics

1 answer:

barxatty [35]3 years ago

3 0

So you can hear stuff

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A 783kg elevator rises straight up 164 meters. What is the potential energy of the elevator?

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Answer:

$potential \: energy = mgh \\ m = 783 \\ g = 10 \\ h = 164 \\ pe = 783 \times 10 \times 164 \\ = 7830 \times 164 \\ = 1284120 \: joule \\ thank \: you$

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2 years ago

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What is the acceleration of a 31 kg object pushed with a force of 42N

Ray Of Light [21]

I belive it could be 6.5 but I could be wrong

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3 years ago

A dog, with a mass of 10.0 kg, is standing on a flatboat so that he is 22.5 m from the shore. He walks 7.8 m on the boat toward

marissa [1.9K]

Answer:16.096

Explanation:

Given

mass of dog $\left ( m_d\right )=10kg$

mass of boat $\left ( m_b\right )=46kg$

distance moved by dog relative to ground= $x_d$

distance moved by boat relative to ground= $x_b$

Distance moved by dog relative to boat=7.8m

There no net force on the system therefore centre of mass of system remains at its position

0= $m_d\times x_d+m_b\dot x_b$

0= $10\times x_d+46\dot x_b$

$x_d=-4.6x_b$

i.e. boat will move opposite to the direction of dog

Now

$|x_d|+|x_b|=7.8$

substituting $x_d$ value

$5.6|x_b|=7.8$

$|x_b|=1.392m$

$|x_d|=6.4032m$

now the dog is 22.5-6.403=16.096m from shore

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3 years ago

Which of the following is a high wave that crashes down onto the

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A breaker is a high wave that crashes onto the ocean floor.

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Which of the following explains why the Earth orbits the sun rather than the sun orbiting the Earth?

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Answer:

Explanation:

because like people and earth,the forces acting on earth by people is negligible .

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3 years ago