COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 7, Problem 76QAP
To determine
What is the speed of the flooded train car if a 5000-kg open train car is rolling at a speed of 20.0 m/s when it begins to rain heavily, and 200 kg of water collects quickly in the car, if only the total mass has changed? For simplicity, assume that all of the water collects at one instant and that the train tracks are frictionless.
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g) Two balls are dropped from the same height. Both balls bounce (perfectly elastic) when they hit theground. Ball A has half the mass of ball B. Which ball has a greater speed after the bounce?h) Two balls are thrown from the same initial height above the ground. Ball A is thrown straight down.Ball B is thrown straight up. Both balls have the same initial speed. Which ball has the larger speedwhen it hits the ground?i) Two identical balls roll down a frictionless track. The tracks are the same height from top to bottom.Track A is straight and track B is curved. If both balls are released from rest, which ball reaches thebottom with the larger speed?j) You see two identical freight trucks driving down the highway. In both cases, the trailer is bouncing upand down on its springs. Truck A is heavier than truck B. Which truck bounces with a higher frequency?
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Chapter 7 Solutions
COLLEGE PHYSICS
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