# on21 - the force at an angle of 60 to the seesaw(d-Answer...

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Solution for On-Line Homework 21 Torque II Solution to On-Line Homework Problem 21.1() Problem: A child is seated on a toy in a playground, often called a seesaw or a teeter-totter. The textbook refers to it as a seesaw in several examples in section 13.1. You are standing on the opposite side of the seesaw from the child, and which to lift her on the seesaw. It is easiest to rotate the child upward Select One of the Following: (a) when you are half-way to the end, and exert the force at an angle of 60 to the seesaw. (b) when you are all the way at the end, and exert the force at an angle to the seesaw. (c) when you are all the way at the end, and exert

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Unformatted text preview: the force at an angle of 60 to the seesaw. (d-Answer) when you are all the way at the end, and exert the force perpendicular to the seesaw. Solution See a careful discussion of this in section 13.1. Total Points for Problem: 2 Points Solution to On-Line Homework Problem 21.2() Problem: When there is no net external torque acting on an object, 1 Select One of the Following: (a) its angular momentum is changing. (b) it cannot be rotating. (c-Answer) it is in rotational equilibrium. (d) it cannot have any angular momentum. Solution When is the angular momentum of a system conserved? Total Points for Problem: 2 Points 2...
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## This note was uploaded on 05/04/2008 for the course PHYS 2054 taught by Professor Stewart during the Spring '08 term at Arkansas.

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on21 - the force at an angle of 60 to the seesaw(d-Answer...

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