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$\bullet$ Rescue. Your friend (mass 65.0 $\mathrm{kg}$ ) is standing on the ice inthe middle of a frozen pond. There is very little frictionbetween her feet and the ice, so she is unable to walk. Fortu-nately, a light rope is tied around her waist and you stand onthe bank holding the other end. You pull on the rope for 3.00 sand accelerate your friend from rest to a speed of 6.00 $\mathrm{m} / \mathrm{s}$while you remain at rest. What is the average power suppliedby the force you applied?

$P=390 \mathrm{watt}$

Physics 101 Mechanics

Chapter 7

Work and Energ

Physics Basics

Applying Newton's Laws

Kinetic Energy

Potential Energy

Energy Conservation

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problem number 83. In this problem, it is given that a percent is this turning on the ice and there is no friction, so he cannot walk by himself from the ice. Another person at the bank is pulling him because an external force is required to accelerate an object from rest. Dumb us off the person on the ice is given its them equals 65 kg that time for the application off the forces. Three seconds. The final velocity attained by the first person is six meters purse again, he's initially rest. So initial velocity is good too, Siegel. Now we have to calculate the power required to well, the men from the ice. So first awful. We will find the acceleration off the person from the rest. Now, using us the question Oh, Motion walked in the ex elation V equals zero less There would be This gives us ex elation equal to six by three, cause two meter per second squared. After this, we will calculate the displacement off the person from the rest. So the displacement d can we open from the second the question Oh, motion the displacement they seek or toe zero plus, huh? Maybe he's square. Is it? Could do Have in tow to Indo three is square, which will give us nine meters. Is the displacement off the first person? No. The power required to pull the person is equal to work done upon total time taken the world and can also be defined US force into displacement Born time The force can read it. And this Um hey, in tow, date up on now You now plugging in the given real loose We get forward because 65 kg moss into X elation to meter per second squared and, uh, this place man, nine meters upon time, which is three seconds. This will give us power equals 3 90 What? This is the required power you pulled off us person from the ice.

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