Physics
7th Edition
ISBN: 9780321733627
Author: Douglas C. Giancoli
Publisher: PEARSON
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Chapter 5, Problem 12MCQ
'A penny is placed on a turntable which is spinning clockwise as shown in Fig. 5-37. If the power to the turntable is turned off, which arrow best represents the direction of the acceleration of the penny at point P while the turntable is still spinning but slowing down?
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Question 4
1. For this series of 4 questions, a rider rides in a car that is connected to a 4-m rod,
and rotates about the z axis. The rod of negligible mass is subjected to a constant
couple moment of M, and the engine of the car supplies a traction force of F.
Neglect the size of the car. You will be asked to solve for different things. Please pay
attention: the numbers may change from problem to problem since they are
randomized.
3) If the rod is subjected to a constant couple moment of M = 800 N•m, and the
engine of the car supplies a traction force of F=11•t N to the wheels, where tis in
seconds, what is the magnitude of the angular impulse from the moment and the
force to the car-rider system in kg•m²/s from t = 0 to t = 5.7 s? Your answer must
include 1 place after the decimal point.
Your Answer:
Answer
M
4 m
F
(III) A curve of radius 78 m is banked for a design speed of 85 km/h If the coefficient of static friction is 0.30 (wet pavement), at what range of speeds can a car safely make the curve? [Hint: Consider the direction of the friction force when the car goes too slow or too fast.]
Chapter 5 Solutions
Physics
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