Neeed assistance on Part A,B,C,D. Thanks in advance! (0%) Problem : Suppose the

Question

Neeed assistance on Part A,B,C,D. Thanks in advance!

(0%) Problem : Suppose the ski patrol lowers a rescue sled carrying an injured skiier, with a combined mass of 77.5 kg, down a 60.0° slope at constant speed, as shown in the Figure. The coefficient of kinetic friction between the sled and the snow is 0.100 60% Otheexpertta.com 25% Part (a) How much work, in joules, is done by friction as the sled moves 31 m along the hill? Grade Summary Deductions 15% Potential 8596 7 8 9 sin0 cotan0asin acos0 atan0 acotan sinhO cosh0 tanh cotanh0 cos0 tan Submissions emaining: 2 Attempts r (5% per attempt) detailed view *12 3 5% 5% 5% END Degrees Radians NO Submit Hint I give up! Hints: 0% deduction per hint. Hints remaining: 2 Feedback: 2% deduction per feedback. 25% Part (b) How much work, in joules, is done by the rope on the sled over this distance? là 25% Part (c) What is the work, in joules, done by the gravitational force on the sled? 25% Part (d) What is the net work done on the sled, in joules?

Explanation / Answer

a) friction work = -µmgdcos?

= -(0.1)(77.5)(9.8)(31)cos60

= -1177.225 J

b) rope work = -mgd(sin? - µcos?)

= -(77.5)(9.8)(31)(sin60 – 0.1*cos60)

= -19212.91 J

c) gravity work = mgdsin?

= (77.5)(9.8)(31)sin60

= 20390.14 J

d) add 'em up

Wnet = 0J

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