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pychu [463]
3 years ago
9

How does the law of conversation of energy apply to machines

Physics
2 answers:
leva [86]3 years ago
4 0

energy transferred to a machine equals energy transferred from it. It is because according to conservation of energy we can't create or destroy energy so, energy remains constant however, their form can be change by machine's. hope i helped

trasher [3.6K]3 years ago
4 0

Answer:

Energy can neither be created nor destroyed but can be transformed from one form to another in a machine with loss in energy in form of heat.

For example, in a machine (mircowave), electrical energy which is a form of energy is transferred to the machine to create thermal energy to warm or defrost food, during this process, energy is converted but not created. The total energy given to the machine is equal to the energy given out by the machine plus energy loss in form of heat.

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A group of hikers hear an echo 3.3 s after they shout. The temperature is 20◦C.
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Answer:

560 m

Explanation:

The speed of sound in air is approximately:

v ≈ v₀ + 0.6T

where v₀ is the speed of sound at 0°C (273 K) in m/s, and T is the temperature in Celsius.

The speed of sound at 20°C at that altitude is:

v ≈ 327 + 0.6(20)

v ≈ 339 m/s

The sound travels from the hikers to the mountain and back again, so it travels twice the distance.

339 m/s = 2d / 3.3 s

2d = 1118.7 m

d = 559.35 m

Rounding, the mountain is approximately 560 m away.

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