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HW_01_S

# HW_01_S - Ph1a 2004 Homework 1 Solution Chefung...

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Ph1a 2004 Homework 1 Solution Chefung Chan ([email protected]), Fall 2004 Each homework problem is worth 5 points. Please disregard the point values listed on the problem itself. Use the points listed below instead. QP1 (5 points) (a) (0.5 point) 22 11 2 0 ( 9.8) 0.64 second su t a t t t =+ ⇒− −⇒ = (b) (1 point) Since the ball is a ‘’Super’’ ball which bounces perfectly elastically from the floor, the system is symmetric and the answer here should be the same as the answer in part (a). That is t = 0.64 second too. If you don’t believe, work through it once. =) (c) (1.5 points) This question seems to be complicated. In fact, if you think about it carefully, this case is also an INERTIAL FRAME !! Therefore, the system here is equivalent to one in (a) and (b) and the answer here is also t = 0.64 second. Right now, let’s do it explicitly. 12 2 1 Let and are the vertical coordinates of the ball and the lift floor relative to the second floor where =0 there 1 and 2 (Notice the ' ' in here means the ball is movi yy y y s ut at y ut ut y =+ + = 2 2 ng upwards due to its inertia) 1 ( It is the same equation as you find in (a)! )

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HW_01_S - Ph1a 2004 Homework 1 Solution Chefung...

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