Chapter 10 Practice problems1) A pulley system lifts a 1345 N weight a distance of 0.975 m. Amanda pulls the rope adistance of 3.9 meters exerting a force of 375 N.A) What is the Ideal Mechanical Advantage of the system?B) What is the Mechanical Advantage?C) What is the efficiency of the system?2) A mover's dolly is used to deliver a refrigerator up a ramp into a house. The refrigeratorhas a mass of 115 kg. The ramp is 2.10 m long and rises 0.850 m. The mover pulls thedolly with a force of 496 N up the ramp. The dolly and ramp constitute a machine.A) What work does the mover do?B) What is the work done on the refrigerator by the machine?C) What is the efficiency of the machine?3) Because there is very little friction, the lever is an extremely efficient simple machine.Using a 90% efficient lever, what input work is required to lift an 18 kg mass through adistance of 0.50 m?4) A motor having an efficiency of 88% operates a crane having an efficiency of 42%. Withwhat constant speed does the crane lift a 410 kg crate of machine parts if the powersupplied to the motor is 5.5 kW?5) What work is required to lift a 215 kg mass a distance of 5.65m using a machine that is72.5% efficient?

Given: output force Fo=1345 Noutput distance do=0.975 minput force Fi=375 Ninput distance di=3.9 m

1) A pulley system lifts a 1345 N weight a distance of 0.975 m. Amanda pulls the rope a distance of 3.9 meters exerting a force of 375 N. A) What is the Ideal Mechanical Advantage of the system? B) What is the Mechanical Advantage? C) What is the efficiency of the system?

1) A pulley system lifts a 1345 N weight a distance of 0.975 m. Amanda pulls the rope a distance of 3.9 meters exerting a force of 375 N. A) What is the Ideal Mechanical Advantage of the system? B) What is the Mechanical Advantage? C) What is the efficiency of the system?

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 91A

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Chapter 10 Practice problems
1) A pulley system lifts a 1345 N weight a distance of 0.975 m. Amanda pulls the rope a
distance of 3.9 meters exerting a force of 375 N.
A) What is the Ideal Mechanical Advantage of the system?
B) What is the Mechanical Advantage?
C) What is the efficiency of the system?
2) A mover's dolly is used to deliver a refrigerator up a ramp into a house. The refrigerator
has a mass of 115 kg. The ramp is 2.10 m long and rises 0.850 m. The mover pulls the
dolly with a force of 496 N up the ramp. The dolly and ramp constitute a machine.
A) What work does the mover do?
B) What is the work done on the refrigerator by the machine?
C) What is the efficiency of the machine?
3) Because there is very little friction, the lever is an extremely efficient simple machine.
Using a 90% efficient lever, what input work is required to lift an 18 kg mass through a
distance of 0.50 m?
4) A motor having an efficiency of 88% operates a crane having an efficiency of 42%. With
what constant speed does the crane lift a 410 kg crate of machine parts if the power
supplied to the motor is 5.5 kW?
5) What work is required to lift a 215 kg mass a distance of 5.65m using a machine that is
72.5% efficient?

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