Suppose you are reshelving books in a library. As you lift abook from the floor and place it on the top shelf, two forcesact on the book: your upward lifting force and the downwardgravity force. (a) Is the mechanical work done by your liftingforce positive, zero, or negative? (b) Is the work done by thegravity force positive, zero, or negative? (c) Is the sum of theworks done by both forces positive, zero, or negative?
Suppose you are reshelving books in a library. As you lift abook from the floor and place it on the top shelf, two forcesact on the book: your upward lifting force and the downwardgravity force. (a) Is the mechanical work done by your liftingforce positive, zero, or negative? (b) Is the work done by thegravity force positive, zero, or negative? (c) Is the sum of theworks done by both forces positive, zero, or negative?
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Suppose you are reshelving books in a library. As you lift a
book from the floor and place it on the top shelf, two forces
act on the book: your upward lifting force and the downward
gravity force. (a) Is the mechanical work done by your lifting
force positive, zero, or negative? (b) Is the work done by the
gravity force positive, zero, or negative? (c) Is the sum of the
works done by both forces positive, zero, or negative?
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