1.A weight lifter lifts a 350-N set of weights from ground level to a position over his head, a vertical distance of 2.00m. How much does the weights lifter do, assuming he moves the weights at constant speed? with free body diagram.

1.A weight lifter lifts a 350-N set of weights from ground level to a position over his head, a vertical distance of 2.00m. How much does the weights lifter do, assuming he moves the weights at constant speed? with free body diagram.

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter7: Work, Energy, And Energy Resources

Section: Chapter Questions

Problem 12PE: (a) Calculate the force needed to bring a 950-kg car to rest from a speed of 90.0 km/h in a distance...

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Concept explainers

Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.

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(a) Calculate the force needed to bring a 950-kg car to rest from a speed of 90.0 km/h in a distance of 120 m (a fairly typical distance for a non-panic stop). (b) Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 2.00 m. Calculate the force exerted on the car and compare it with the force found in part (a).
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