Tutorials in Introductory Physics
1st Edition
ISBN: 9780130970695
Author: Peter S. Shaffer, Lillian C. McDermott
Publisher: Addison Wesley
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Textbook Question
Chapter 4.2, Problem 1aT
A ruler is placed on a pivot and held at an angle as shown at right. The pivot passes through the center of the ruler.
Predict the motion of the ruler after it is released from rest. Explain your reasoning.
Check your prediction by observing the demonstration.
1. Is the
What does your answer imply about the net torque on the ruler about the pivot? Explain.
2. What is the direction of the acceleration of the center of mass of the ruler? If
What does your answer imply about the net force acting on the ruler? Explain.
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The disk is moving to the left such that it has an angular acceleration αα = 9 rad/s2rad/s2 and angular velocity ωω = 2 rad/srad/s at the instant shown. It does not slip at AA. Suppose that rrr = 0.4 mm .
Part A.)
Determine the magnitude of the acceleration of point BB.
Express your answer to three significant figures and include the appropriate units.
Part B
Determine the direction of the acceleration of point BB measured clockwise from the positive xx axis.
Express your answer using three significant figures.
thanks for your help! ive been stuck on this problem all day
Part A
Determine the angular velocity of link BC at the instant shown. Take wAR = 14 rad/s. (Figure 1)
Express your answer to three significant figures and include the appropriate units.
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WBC =
Value
Units
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Part B
Figure
1 of 1
Determine the angular velocity of link CD at the instant shown.
Express your answer to three significant figures and include the appropriate units.
D
HA
?
0.2 m
0.4 m
0.2 m
Value
Units
WCD =
B
30°
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WAB
B. Solve the problem below. Show your complete solutions.
1. A grindstone 3 m in diameter rotates at a constant angular acceleration of 10 rad/s?.
It has an initial angular velocity of (60/TT)rpm (revolution per minute). After 3 seconds,
compute (a) the angular speed, (b) the angular displacement, (c) the linear speed of
a point on the rim and (d) the linear acceleration of a point on the rim.
Chapter 4 Solutions
Tutorials in Introductory Physics
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Ch. 4.2 - A ruler is placed on a pivot and held at an angle...Ch. 4.2 - Draw a free-body diagram for the ruler (after it...Ch. 4.2 - How would your free-body diagram change if the...Ch. 4.2 - Predict: which spool will reach the floor first....Ch. 4.2 - Obtain two spools and a ring stand. Use the...Ch. 4.2 - Consider the following discussion between three...Ch. 4.2 - Write down Newton’s second law for each spool....Ch. 4.3 - A T-shaped board of uniform mass density has two...Ch. 4.3 - Prob. 1bTCh. 4.3 - Attach day to the bottom left side of the board so...Ch. 4.3 - Prob. 2bTCh. 4.3 - C. Imagine that the T-shaped board (with no clay...
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