PRACTICE IT Use the worked example above to help you solve this problem. The hoc

Question

PRACTICE IT Use the worked example above to help you solve this problem. The hockey puck in the figure, struck bya hockey stick, is given an initial speed of 22.0 m/s on a frozen pond. The puck remains on the ice and slides 1.18 x 102 m, slowing down steadily until it comes to rest. Determine the coefficient of kinetic friction between the puck and the ice. EXERCISE HINTS: GETTING STARTED | I'M STUCK! An experimental rocket plane lands and skids on a dry lake bed. If it's traveling at 84.0 m/s when it touches down, how far does it slide before coming to rest? Assume the coefficient of kinetic friction between the skids and the lake bed is 0.520.

Explanation / Answer

From work energy theorem

W = 1/2 m v2

mu m g d = 1/2 m v2

mu = v2 / 2 g d

= (222) / (2 * 9.8 * 1.18 * 102)

coefficient of kinetic friction = 0.209

------------------------------------------------

m a = -Ff

m a =  -mukm g

a = -muk g = -0.520 * 9.8  = -5.096 m/s2

v2 = v02 + 2ad

d = 842 / (2 * 5.096)

= 692 m

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