College Physics
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ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Transcribed Image Text:A child pulls a sled upon
snow covered hill. The child
dose 315 J of work on the
sled . If child walks 15 m up
the hill , how large a force
must child exert ?
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- A 4.5kg sled is pulled across level snow with a force of 225N on a rope that is 35 degrees above the horizontal. If the sled moves 65.3m in 2.5 minutes, how much work does the person do on the sled? How much power is exerted on the sled? The person is pulling as hard as possible on the rope. How else can the amount of work be increased?arrow_forwardA force of 17 Ib is required to hold a spring stretched 3 in. beyond its natural length. How much work W is done in stretching it from its natural length to 9 in. beyond its natural length?arrow_forwardWhile riding on an elevator, a person has twoforces acting on him, a normal force and a gravity force. Suppose the person has mass m is on an elevator that 1 descends a distance d. If the total work on the person is Wiotal = -mgd, what is 4 the magnitude of the normal force? Is the elevator speeding up or slowing down? The knowns in this problem are m and g.arrow_forward
- A skier of mass 77 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 55 m up a 30° slope (assumed frictionless) at a constant speed of 2.4 m/s? kJ (b) What power (expressed in hp) must a motor have to perform this task? hp Need Help? Read Itarrow_forwardA man pushes a 85.9-N crate a distance of 3.7 m up a long frictionless ramp at a constant speed. His pushing force is parallel to the ramp. The ramp makes a 30.0-degree angle with the horizontal. What is the work done by the man in pushing the crate? Give your answer in joules, rounded to one decimal place.arrow_forwardA child on a sled is pulled by using a rope that makes an angle of 40° with the horizontal. Determine the work done if the tension in the rope is 75 N and the horizontal distance moved is 30 m.arrow_forward
- What average mechanical power (in W) must a 72.0 kg mountain climber generate to climb to the summit of a hill of height 345 m in 46.0 min? Note: Due to inefficiencies in converting chemical energy to mechanical energy, the amount calculated here is only a fraction of the power that must be produced by the climber's body. HINT W Need Help? Read It Watch Itarrow_forwardWorkarrow_forwardAn applied force of 20 N i pushes an object that is initially at rest over a horizontal surface. The coefficient of kinetic friction is 0.450 and the mass is 1.4 kg. If the net work done at some point is 60.6 J, what is the object's speed at that point?arrow_forward
- a 4.5 kg sled is pulled across a level snow with a force of 225N on a rope that is 35° above the horizontal. If the sled moves 65.3m in 2.5minutes, how much work does the person do on the sled? How much power is exerted on the sled? The person is pulling as hard as possible on the rope, how else can the amount of work be increased?arrow_forwardA four-meter chain hangs from a ceiling. The chain has a density of 1.5 kilograms per meter. Find the work done if the lower end of the chain is lifted to the ceiling so that it is level with the upper end.arrow_forwardA skier of mass 61 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 80 m up a 30° slope (assumed frictionless) at a constant speed of 2.9 m/s? KJ (b) What power (expressed in hp) must a motor have to perform this task? hparrow_forward
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