An ice hockey puck is sliding over a frictionless horizontal surface with a constant velocity of vo = 10.2 m Find the velocity of the puck after it passes a rough area of length L 6 m and with the kinetic friction coefficient u = 0.33 as shown below. Hint: the mass of the puck is not needed, you can either calculate everything per unit of mass or, if it helps, take m 160 grams. Vo

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An ice hockey puck is sliding over a frictionless horizontal surface with a constant velocity of vo = 10.2 m/s.
Find the velocity of the puck after it passes a rough area of length L 6 m and with the kinetic friction
coefficient u = 0.33 as shown below. Hint: the mass of the puck is not needed, you can either calculate
everything per unit of mass or, if it helps, take m 160 grams.
%3D
%3D
%3D
%3D
m
Vo
L
The steps to follow: (1) find the initial KE of the puck; (2) find the work done by the friction force (should
be negative); (3) find the final kinetic energy as KE; = KE; + W, meaning that some of the initial
kinetic energy is lost due to the work done by friction; (4) from the final KE find the final speed.
The final speed of the puck, Vf =7.28
X Units m/s
%3D
If the initial speed of the puck is not high enough the puck will get stuck in the rough area. At what
minimal initial speed should the puck move to barely make it through the rough area?
The minimal initial velocity, Vmin
= 38.84 X Units m/s
Question Help: Message instructor D Post to forum
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Transcribed Image Text:An ice hockey puck is sliding over a frictionless horizontal surface with a constant velocity of vo = 10.2 m/s. Find the velocity of the puck after it passes a rough area of length L 6 m and with the kinetic friction coefficient u = 0.33 as shown below. Hint: the mass of the puck is not needed, you can either calculate everything per unit of mass or, if it helps, take m 160 grams. %3D %3D %3D %3D m Vo L The steps to follow: (1) find the initial KE of the puck; (2) find the work done by the friction force (should be negative); (3) find the final kinetic energy as KE; = KE; + W, meaning that some of the initial kinetic energy is lost due to the work done by friction; (4) from the final KE find the final speed. The final speed of the puck, Vf =7.28 X Units m/s %3D If the initial speed of the puck is not high enough the puck will get stuck in the rough area. At what minimal initial speed should the puck move to barely make it through the rough area? The minimal initial velocity, Vmin = 38.84 X Units m/s Question Help: Message instructor D Post to forum Submit Question
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