test1_09Soln

# test1_09Soln - LAST NAME: STUDENT NR: PHYS 1010 6.0: CLASS...

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LAST NAME: STUDENT NR: PHYS 1010 6.0: CLASS TEST 1 Time: 50 minutes; Calculators & formulae provided at the end = only aid; Total = 15 points. 1) A toy cannon is mounted on a hockey puck to shoot horizontally, and placed on perfect ice. When ﬁred (by releasing a loaded spring) it accelerates a small ball of mass m = 5g inside its muzzle with a = 30m / s 2 . The puck/cannon assembly recoils with an acceleration of a = 0 . 25m / s 2 . What is the mass of the puck/cannon assembly? a) [2] sketch the situation, and name and state the laws from which you can solve this problem. b) [2] derive a formula for the mass of the puck/cannon assembly starting from the laws. c) [1] calculate the mass of the puck/cannon assembly, and assess whether the answer is rea- sonable. 1

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2) A ball is shot straight upward using a tennis racquet at height h = 1m above ground level with speed v 0 , while standing in front of a pit (big hole in the ground) of depth d = 10m. Air drag can be ignored, and use g = 10m / s. a) [3] Sketch the situation indicating the velocity vectors at these points: release of ball (
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## This note was uploaded on 06/11/2010 for the course PHYS 1410 taught by Professor Wijngaarden during the Spring '09 term at York University.

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test1_09Soln - LAST NAME: STUDENT NR: PHYS 1010 6.0: CLASS...

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