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Unformatted text preview: Chapter 12 12.5 In the fgure, a uniForm sphere oF mass m = 0.85 kg and radius r = 4.2 cm is held in place by a massless rope attached to a Frictionless wall oF distance L = 8.0 cm above the center oF the sphere. ¡ind (a) the Tension in the cord and (b) the Force oF the sphere From the wall m N T q L tan θ = r L ⇒ θ = tan − 1 ( r L ) = 27.70 ° ydirection = T cos θ − mg T = mg cos θ = 9.41 N x direction = N − T sin θ N = T sin θ = 4.373 N 12.9 A 75 kg window cleaner uses a 10 kg ladder that is 5.0 m long. He places one end on the ground 2.5 m From a a wall, rests the upper end against a cracked window and climbs the ladder. He is 3m up along the ladder when the window breaks. Neglect Friction between the ladder and window and assume that the base oF the ladder does not slip. When the window is on the verge oF breaking, what are (a) the magnitude oF the Force on the window From the ladder, (b) the magnitude oF the Force on the ladder From the ground and (c)the angle (relative to the horizontal oF that Force on the ladder. We defnitely need a picture For this problem. 2.5m 5.0m 3.0m F g mg Mg F v F h q q Since we don’t know either of the forces at the base of the ladder we will choose that as our axis...
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This note was uploaded on 09/27/2010 for the course ASD 2456 taught by Professor Jojo during the Spring '10 term at Brooklyn Law School.
 Spring '10
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