doingmuret y storage, an ext st use a guest print Going for a Rough Ride ries an
ID: 1449447 • Letter: D
Question
doingmuret y storage, an ext st use a guest print Going for a Rough Ride ries and lobbies, an oue in 8 hours, 14 minutes with lids) are allo than five minutes righted materials. A block of mass 0.32kg starts from rest at point A and slides down a frictionless hill of height h. At the bottom of the hill it slides across a piece of track where the coefficient of kinetic freion is 036. This section (from points B to C) s·sem n engh loop of radius r 3.27m. Point D is the highest point in the loop. The loop has a total height of 2r. Note that the drawing horieontal friction is 0.36. This section (from points 8 to C) is 3.68m in length. The block then enters a frictionless below is not to scale. What is the minimum speed of the block at point D thet still allows the black to complete the loop without leaving the track Submit Anawer Tries 0/10 What i is the minimum kinetic energy for the block at point C in order to have enough speed at point D a that the block weill not leave the track? Suomit Anwwr Tries o/10 What is the minimum kinetic energy for the block at point s in order to have enough speed at point D that the block wit not leave the track? Submit Answer Tries 0/10 What is the minimum height from which the block should s start in order to have enough speed at point D that the block witl not leeve the track? Submit Answer Tries 0/10 Send Feedback This discussion is closedExplanation / Answer
a)
N = mv^2/r - mg = 0
v = sqrt(rg) = 5.66m/s
b)
K.E. at C = 0.32 x 5.66^2 /2 + 0.32 x 2 x3.37g = 26.28 J
c) work done by friction + K.E. at C =K.E. at B
0.36 x 0.32g x 3.68 + 26.28 = K.E. at B
= 30.43 J
d) mgh = 0.32 x 9.8 x h = 30.43 J
h = 9.70 m
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