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BARSIC [14]
3 years ago
7

Why is it impossible to create a perpetual motion machine?

Physics
1 answer:
enyata [817]3 years ago
8 0

Answer:

The first law of thermodynamics is the law of conservation of energy. It states that energy is always conserved. ... To keep a machine moving, the energy applied should stay with the machine without any losses. Because of this fact alone, it is impossible to build perpetual motion machines.

Explanation:

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Answer:

The average power is calculated as 735.0 W

Solution:

As per the question:

Total mass, M = 1200 kg

Counter mass of the elevator, m = 950

Distance traveled by the elevator, d = 54 m

Time taken, t = 3 min = 180 s

Now,

To calculate the average power:

First, we find the force needed for lifting the weight:

Force, F = (M - m)g = (1200 - 950)\times 9.8 = 2450 N

Now, the work done by this force:

W = Fd = 2450\times 54 = 132300\ J = 132.3\ kJ

Average power is given as:

P_{avg} = \frac{W}{t} = \frac{132300}{180} = 735.0\ W

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3 years ago
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Answer:

Explanation:

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c) ωs = 3.5 m/s / 0.65 m = 5.38 rad/s

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t = θ/ω = 2π / 2.55 = 2.463... <u>2.5 s</u>

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