A uniform plank of length 4.30 m and weight 226 n rests, Ask an Expert

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Q1. A uniform plank of length 4.30 m and weight 226 N rests horizontally on two supports, with 1.10 m of the plank hanging over the right support (see the drawing). To what distance x can a person who weighs 437 N walk on overhanging part of the plank before it just begins to tip?

Q2. A square of edge length 15.0 cm is formed by four spheres of masses m1 = 5.10 g, m2 = 3.50 g, m3 = 0.820 g, and m4 = 5.20 g. In unit-vector notation, what is the net gravitational force from them on the central sphere with mass m5 = 2.00 g?

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