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podryga [215]
3 years ago
7

Assuming weightless pulleys and 100% efficiency, what is the minimum input force required to lift a 120 N weight using a single

fixed pulley?
A. 21 N
B. 61 N
C. 121 N
D. 241 N
Physics
1 answer:
Free_Kalibri [48]3 years ago
8 0
May be b I’m not for sure tho
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Which of the following would produce the most power?
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Answer:

A mass of 10 kilograms lifted 10 meters in 5 seconds.

Explanation:

Power can be defined as the energy required to do work per unit time.

Mathematically, it is given by the formula;

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But Energy = mgh

Substituting into the equation, we have

Power = \frac {mgh}{time}

Given the following data;

Mass = 10kg

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Time = 5 seconds

We know that acceleration due to gravity is equal to 9.8 m/s²

Power = \frac {10*9.8*10}{5} = 490 Watts

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The force an ideal spring exerts on an object is given by Fx = -kx, where x measures the displacement of the object from its equ
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Answer:

The work done by this force can be found via the following formula

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Explanation:

Alternatively, the work done by the object is equal to the elastic potantial energy done by the spring.

U = \frac{1}{2}kx_2^2 - \frac{1}{2}kx_1^2 =0 - \frac{1}{2}60(-20)^2 = -12000J

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Explanation:

Hoped this helped!

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