(5%) Problem 14: An ice hockey player of mass ml,-92 kg hits a puck of mass m2 =

Question

(5%) Problem 14: An ice hockey player of mass ml,-92 kg hits a puck of mass m2 = 0.135 kg, giving the puck a speed of v = 45.5 m/s 50% Part (a) If both are initially at rest and if the ice is frictionless, how far, in terms of the variables in the problem, does the player recoil in the time it takes the puck to reach the goal, a distance d away? 50% Part (b) If both are initially at rest and if the ice is frictionless, how far, in centimeters, does the player recoil in the time it takes the puck to reach the goal, 16.5 m away? Grade Summary Deductions Potential dh-0.024 3% 97% sinO Submissions Attempts remaining: 2 (1% per attempt) detailed view cosO tan 789 HOME acos) acotansinh0) cosh0 tanh0 cotanh0 asin atan)a 1% 1% 1% 0 END Degrees Radians BACKSPACE DEL CLEAR Submit Hint Feedback I give up! Hints: 0% deduction per hint. Hints remaining: 1 Feedback: 0% deduction per feedback

Explanation / Answer

Here ,

part A) let the recoil speed is v2

Using conservation of momentum

m1 * v1 - m2 * v2 = 0

v2 = m2 * v/m1

Now, for the time taken

t = d/v2

t = d * m1/(m2 * v)

the time taken is d * m1/(m2 * v)

part b) for d = 16.5 m

time taken = 16.5 * 92/(0.135 * 45.5)

time taken = 247 s

the time taken is 247 s

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