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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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Section
BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

As a mass tied to the end of a string strings from its highest point down to its lowest point, it is acted on by three forces: gravity, tension, and air resistance. Which force does (a) positive work? (b) negative work? (c) zero work?

(a)

To determine
The force that causes the positive work.

Explanation

The definition for work is,

W=Fd

  • F is the magnitude of the force acting on the object
  • d is the magnitude of the object’s displacement

When the mass tied to the end of a string swings from its highest point down to its lowest point, the force due to gravity is doing

(b)

To determine
The force that causes the negative work.

(c)

To determine
The force that causes the zero work.

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