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3 years ago

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A crane lifts an I-beam up the side of a building. The crane's power output is 1750W for 20 seconds. After 20 seconds the I-beam

was moving at 2 m/s and the mass has 200 kg. Use the work-energy process to determine the change in height of the I-beam.

1 answer:

Arada [10]3 years ago

3 0

Explanation:

This is one of those great problems that is harder to read than to solve!

Remember the following...

Power is the amount of work done over time. $P = \frac{W}{t}$

and that work is Force times distance. $W = F * d$

and that Force is just mass times acceleration. $F = m * a$

So... nesting all the equations together we might get something that looks like. $P = \frac{m*a*d}{t}$

We know the power, the time, the acceleration (at this given time) and the mass. We can then solve for d. $d = \frac{P*t}{m*a}$

Plug and chug!

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A bicycle wheel with radius 0.3 m rotates from rest to 3 rev/s in 5 s. What is the magnitude and direction of the total accelera

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Answer:

Explanation:

Given

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Energy intake = 400 J

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