COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 4, Problem 45QAP
To determine
The plot of velocity Vs height of an elevator.
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A 50.0 kg man standing on a spring scale takes a descending elevator ride (DOWNWARD). Starting from the rest, the elevator descends, attaining a maximum speed of 8.0 m/s in 4.0 seconds. Then the elevator travels with this constant speed of 8.0 m/s for 10.0 seconds. Lastly, it takes the elevator 2.0 second to make a complete stop. Based on the information above, answer the questions below:
(Hint: Drawing pictures would help you understand the 3 legs of this elevator ride. Since the elevator is descending, going down, it is more convenient to chose downward direction as + direction. Please pay attention to the sign of each physical quantity, such as velocity, acceleration, and displacement, etc.
Useful formula: v = vi + a×t, or
d = v0×t + ½ a × t2,
Weight = mg,
Newotn’s 2nd Law: Net force Fnet = ma
(1). What is the acceleration of the elevator during the 1st 4.0 seconds of the ride? Is the direction of…
The strings and frictionless pulleys have negligible masses. The coefficients of kinetic friction is 0.25 and static friction is 0.30. Block A has a mass of 3 kg and block B has a mass of 4 kg. a) What is the maximum mass block C can have before block B will start to move? b) If block C has a mass of 7 kg and was 1 m above the ground, how long would it take block C to hit the ground starting from rest?
A frictionless plane is 10.0 m long and inclined at 30.0°. A sled starts at the bottom with an initial speed of 5.30 m/s up the incline. When
the sled reaches the point at which it momentarily stops, a second sled is released from the top of the incline with an initial speed v₁. Both
sleds reach the bottom of the incline at the same moment.
(a) Determine the distance that the first sled traveled up the incline.
m
(b) Determine the initial speed of the second sled.
m/s
Chapter 4 Solutions
COLLEGE PHYSICS
Ch. 4 - Prob. 1QAPCh. 4 - Prob. 2QAPCh. 4 - Prob. 3QAPCh. 4 - Prob. 4QAPCh. 4 - Prob. 5QAPCh. 4 - Prob. 6QAPCh. 4 - Prob. 7QAPCh. 4 - Prob. 8QAPCh. 4 - Prob. 9QAPCh. 4 - Prob. 10QAP
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