Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
12th Edition
ISBN: 9781259587399
Author: Eugene Hecht
Publisher: McGraw-Hill Education
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Chapter 7, Problem 14SP

With a wheel and axle, a force of 80 N applied to the rim of the wheel can lift a load of 640 N. The diameters of the wheel and axle are 36 cm and 4.0 cm, respectively. Determine the AMA, IMA, and efficiency of the machine.

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Pitch of a 50 mm diameter threaded screw of a screw jack is 12.5 mm. The C.O.F. between the screw and nut is 0.13. Determine the torque required on the screw to raise a load of 27 kN assuming load to be rotating with screw. Determine the ratio of the torque required to raise to lower the load and also the efficiency of the machine.
You are using a screwdriver to screw in a screw that has a pitch of 3 cm. The screwdriver has a handle radius of 10 cm.   A: If the efficiency is 35%, how much effort (applied) force is needed to overcome a resistance force of 40 N? B: What is the reason for low efficiency of the screw? Where does the energy go?
plve the problem. 1. You are using a wheel and axle as a simple machine. You applied a force of 30 lb to the rim of the wheel so that it can lift a load of 240 lb. The diameters of the wheel and axle are 3 feet and 4 inches, respectively. Determine the efficiency of the machine.
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