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$\bullet$ $\bullet$ More mountain climbing! What would be the speed ofthe climbers in the previous problem after they had moved of1.50 $\mathrm{m}$ if there were friction between the upper climber andthe ice with a coefficient of kinetic friction of 0.250$?$

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3 $\mathrm{m} / \mathrm{s}$

Physics 101 Mechanics

Chapter 7

Work and Energ

Physics Basics

Applying Newton's Laws

Kinetic Energy

Potential Energy

Energy Conservation

Fco C.

February 8, 2021

A 50 g object and a 500 g object are launched by pressing them against identical springs and compressing both springs by the same amount. (a) Which spring has more initial poten tial energy? (b) Which object gains more kinetic energy after being released?

Cornell University

University of Michigan - Ann Arbor

University of Washington

Hope College

Lectures

03:47

In physics, the kinetic energy of an object is the energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body in decelerating from its current speed to a state of rest. The kinetic energy of a rotating object is the sum of the kinetic energies of the object's parts.

04:05

In physics, a conservative force is a force that is path-independent, meaning that the total work done along any path in the field is the same. In other words, the work is independent of the path taken. The only force considered in classical physics to be conservative is gravitation.

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problem number 81. In this problem, it is given that on a cliff there is a heavier clamber kept 11 and a lighter. Clubman Small m Let this level as the d b call 20 level gravitational potential Energy is zero yah. Initially the book the clambers our interest on the live. But do you do slipping the lighter clamber false by our distance That's and behavior clamber slips by a distance that his bit next downwards the frictional force acts end up was in direction and we have to calculate the velocity off the system when the light of lumber falls. Bye. Ah, hype at given daughter You Tellem Because 75 cagey, lighter clamber has very small chemicals 60 kg The coefficient of friction between the fit off heavier clamber and the ice is Ciro point 25 No, the height is given it 1.5 meters now applying and as he conservation the initial energy off the system off to clambers is mg at less Mt Edge. Since the system was initially interest, so there can etiquette and residual with zero. The final traditional potential energy of the heavier clamber is m g et because he doesn't fall. The system's final kinetic energy is bless the energy lost due to friction which is frictional force into distance by which clamber slipped. Which is that now canceling this on both sides. We get 60 into 9.8 into 1.5. Is it called Tau uh into 1 35 into V squared Bless meal. Mm G Since friction forces only a ping on the heavier clamber who is on the cliff mg and distance traveled by him at this gives us you're here too equals 67 15 B square plus 0.25 in tow, 75 into 9.8 into 1.5. On solving this, we get the velocity off the system as because two point 99 meter per second, which is approximately equal to three meter per second.

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