A uniform plank of length 4.50 m and weight 275 n rests, Ask an Expert

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Q1. A metal rod is 40.186 long at 20.38 and 40.199 long at 45.5. Compute the average coefficient of linear expansion of rod's material for this temperature range.

Q2. A uniform plank of length 4.50 m and weight 275 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support. To what distance x can a person who weighs 456 N walk on the overhanging part of the plank before it just begins to tip?

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