Make sure to draw a sketch with scale as well 6.3 A factory worker pushes a 30.0 kg crate a distance of 4.5 m alonga level floor at constant velocity by pushing horizontally on it. Thecoefficient of kinetic friction between the crate and the floor is 0.25.(a) What magnitude of force must the worker apply? (b) How muchwork is done on the crate by this force? (c) How much work is done onthe crate by friction? (d) How much work is done on the crate by thenormal force? By gravity? (e) What is the total work done on the crate?

Answered: 6.3 A factory worker pushes a 30.0 kg…

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter10: Work, Energy And Machines

Section: Chapter Questions

Problem 40A

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Similar questions

Cite two examples in which a force is exerted on an object without doing any work on the object.
A particle of mass 2.0 kg moves under the influence of the force F(x)=(5x2=7x)N . Suppose a frictional force also acts on the particle. If the particle’s speed when it starts at x=4.0 m is 0.0 m/s and when it arrives at x=4.0 m is 9.0 m/s, how much work is done on it by the frictional force between x=4.0 m and x=4.0 m?
The surface of the preceding problem is modified so that the coefficient of kinetic friction is decreased. The same horizontal force is applied to the crate, and after being pushed 8.0 m, its speed is 5.0 m/s. How much work is now done by the force of friction? Assume that the crate starts at rest.
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance?
Calculate the power output needed for a 950-kg car to climb a 2.00 slope at a constant 30.0 m/s while encountering wind resistance and friction totaling 600 N.
A 5.0-kg box has an acceleration of 2.0m/s2 when it is pulled by a horizontal force across a surface with K=0.50 . Find the work done over a distance of 10 cm by (a) the horizontal force, (b) the frictional force, and (c) the net force. (d) What is the change in kinetic energy of the box?
Describe a situation in 4iich a force is exerted for a long time but does no work. Explain.
“ E=K+Uconstant is a special case of the work energy theorem.” Discuss this statement.
Give an example of a situation in which there is a force and a displacement, but the force does no work. Explain why it does no work.
A particle moving in the xy -plane is subject to a force F(x,y)=(50Nm2)(xi+yj)( x 2 + y 2 )3/2 , where x and y are in meters. Calculate the work done on the particle by this force, as it moves in a straight line from the point (3 in, 4 m) to the point (8 in, 6 in).
A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (K=0.20) at constant velocity by a force directed 25 above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
A sled of mass 70 kg starts from rest and slides down a 10 incline 80 m long. It then travels for 20 m horizontally before starting back up an 8° incline. It travels 80 m along this incline before coming to rest. What is the magnitude of the net work done on the sled by friction?

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