College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Physics
Angular Motion

A homeowner is trying to move a stubborn rock from his yard. By using a a metal rod as a lever arm and a fulcrum (or pivot
point) the homeowner will have a better chance of moving the rock. The homeowner places the fulcrum a distance d = 0.288 m
from the rock, which has a mass of 345 kg, and fits one end of the rod under the rock's center of weight.
d
Assume that the rod is massless and nearly horizontal so that the weight of the rock and homeowner's force are both
essentially vertical. The acceleration due to gravity is g
= 9.81 m/s².
If the homeowner can apply a maximum force of 615 N at the
other end of the rod, what is the minimum total length L of
the rod required to move the rock?
L =
m
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Transcribed Image Text:A homeowner is trying to move a stubborn rock from his yard. By using a a metal rod as a lever arm and a fulcrum (or pivot point) the homeowner will have a better chance of moving the rock. The homeowner places the fulcrum a distance d = 0.288 m from the rock, which has a mass of 345 kg, and fits one end of the rod under the rock's center of weight. d Assume that the rod is massless and nearly horizontal so that the weight of the rock and homeowner's force are both essentially vertical. The acceleration due to gravity is g = 9.81 m/s². If the homeowner can apply a maximum force of 615 N at the other end of the rod, what is the minimum total length L of the rod required to move the rock? L = m
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