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# Two children push on opposite sides of a door during play.

## Problem 3PE Chapter 9

Physics: Principles with Applications | 6th Edition

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Physics: Principles with Applications | 6th Edition

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Problem 3PE

Two children push on opposite sides of a door during play. Both push horizontally and perpendicular to the door. One child pushes with a force of 17.5 N at a distance of 0.600 m from the hinges, and the second child pushes at a distance of 0.450 m. What force must the second child exert to keep the door from moving? Assume friction is negligible.

Step-by-Step Solution:

Solution 3PE Step-by-step solution Step 1 of 4 Both the children applied force in opposite direction. If the door is not moving then the torque caused by each of them must cancel each other. Torque depends upon magnitude of force applied F and the perpendicular distance . Step 2 of 4 The torque on the door by the first child is, The torque on the door by the second child is,

Step 3 of 4

Step 4 of 4

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