1. 120 points OSColPhys1 7.1.008 My Notes Ask Your Teacher Suppose the ski patro

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1. 120 points OSColPhys1 7.1.008 My Notes Ask Your Teacher Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 95.0 kg, down a = 68.0° slope at constant speed, as shown in Figure 6.22. The coefficient of friction between the sled and the snow is 0.100 Figure 6.22 (a) How much work is done by friction as the sled moves 30.0 m along the hill? (b) How much work is done by the rope on the sled in this distance? (c) What is the work done by gravity on the sled? (d) What is the total work done? Submit Answer Save Progress Practice Another Version

Explanation / Answer

(A) fk = uk N = uk m g cos68

d = 30 m

W = fk d cos180

= - 0.10 x 95 x 9.8 x cos68 x 30

= - 1046.3 J  

(B) alongthe incline.

T = m g sin(theta) - fk = 827.2 N  

W = T d cos180 = - 24817 J  

(c) W = m g d sin68 = 25896 J

(d) total work done = 0

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