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Q. 60

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 333

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Short Answer

A 40 kg, 5.0-m-long beam is supported by, but not attached to, the two posts in Figure P12.60. A 20 kg boy starts walking along the beam. How close can he get to the right end of the beam without it falling over?

He can walk up to 1 meter from the end without it falling over .

See the step by step solution

Step by Step Solution

Step 1: Given information

Mass of beam = 40 kg,

length of beam = 5.0-m

supported by, but not attached to, the two posts as shown in figure

mass of boy = 20 kg

Step2: Explanation

First create the diagram as below

Then equate the clockwise and anti-clockwise torque.

Lets assume it can walk upto x m from right end , then solve for x.

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