Midterm1_Fall_09_key_final

# Midterm1_Fall_09_key_final - PHY 2048-S4 Fall 2009...

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PHY 2048-S4, Fall 2009 Examination #1 September 24, 2009 Instructor: Beatriz Roldan Cuenya Name______________________________________ID______________ Please answer all questions. #1______________ #2______________ #3______________ #4______________ #5______________ Total: ___________ Show all work and enter answers in boxes, if provided.

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1. An object moves along the x-axis according to the equation: x(t) = (2 t 2 + t - 1) m, where t is in seconds. Determine: (20 points) (a) the average speed between t = 1 s and t = 4 s, (b) the instantaneous speed at t = 3 s (c) the average acceleration between t = 1 s and t = 4 s, (d) the instantaneous acceleration at t = 3 s (a) v avg = m/s (b) v = m/s (c) a avg = m/s 2 (d) v avg = m/s 2
2. A car (initially at rest) starts moving with a constant acceleration of 2 m/s 2 until it reaches a speed of 8 m/s. He then keeps that speed constant for some time. If the total distance traveled is 250 m, how much time does it take for the total trip of the car? (20 points) t = s

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3. A particle undergoes three consecutive displacements:
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Midterm1_Fall_09_key_final - PHY 2048-S4 Fall 2009...

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