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Quiz2_key

# Quiz2_key - t = 2 s find the particle’s velocity at t =...

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PHYS 2305 CHANG: Quiz 2, Spring 2009 Name (print)___________________ KEY ____________________________ I have neither given nor received any unauthorized aid on this quiz. Pledge ______________________________________________ Instructions : Show your work to receive credit , and present your answers with 3 significant figures and proper units . 1. A particle moves along a straight line, and for 0 t 10 s its position is given as x = t 3 + 3 t 2 – 45 t +10 m. Find the average speed of the particle for the interval t = 1 s to t = 5 s. Average speed = _______ 24 m/s _________ 2. A particle is moving along a straight line with constant acceleration. Measured from a chosen reference frame, the particle‘s position is +6 m at t = 0, and it is at 3 m when t = 10 s. If the particle is observed to change its direction of motion at
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Unformatted text preview: t = 2 s, find the particle’s velocity at t = 10 s. υ = ________ − 2.4 m/s ___________ 3. A sprinter starts from rest and reaches his top speed in 10 seconds running with a constant acceleration. He then maintains that top speed and finishes the 200 m run in the overall time of 25 seconds. Find his acceleration. ________ 1 m/s 2 __________ 4. A model rocket initially at rest on the ground is fired vertically upward, and the engine thrust produces a constant acceleration a = 25 m/s 2 . After running for 4 s the engine is cut off and then the rocket is in free fall. Find the speed of the rocket just before it hits the ground. ________ 118 m/s __________...
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