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 18.1, Problem 2aTH
For each situation described below, describe a possible motion of the turntable. (Some parts have more than one correct answer.) Explain your reasoning in each case.
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The Subparts to be solved D & E.
The angular position of a rod varies as 23.7t2 radians from time
t = 0. The rod has two beads on it as shown in the following figure, one at
r1 = 15 cm from the rotation axis and the other at r2 = 42 cm from the rotation axis. (Note: figure may not be drawn to scale.)
(a) What is the instantaneous angular velocity (in rad/s) of the rod at
t = 7 s?
(Indicate the direction with the sign of your answer. Round your answer to at least one decimal place.)
rad/s
(b) What is the angular acceleration (in rad/s2) of the rod at
t = 7 s?
(Indicate the direction with the sign of your answer.)
rad/s2
(c) What are the tangential speeds of the beads (in m/s) at
t = 7 s?
vt, 1
= m/s
vt, 2
= m/s
(d) What are the tangential accelerations of the beads at
t = 7 s?
(Enter the magnitudes in m/s2.)
at, 1
= m/s2
at, 2
= m/s2
(e) What are the centripetal accelerations of the beads at
t = 7 s?
(Enter the magnitudes in m/s2.)
ac, 1
= m/s2
ac, 2
=…
PLEASE PUT SOLUTION (WHY) // WHY THE REASON OF THAT ANSWER (?)
1. What should be done to increase the generated torque on a bar, with one end fixed to a point, without increasing the applied force?
A. Make the moment arm shorter.
B. Increase the weight of the moment arm.
C. Move the axis of rotation closer to the point where force is applied.
D. Increase the length of the moment arm.
2. How will the generated torque change if you move the axis of rotation from the middle of a bar to its left end, given that the applied force is applied at its right end?
A. Torque will be doubled.
B. Torque will increase 1.5
times the original.
C. Torque will remain the same.
D. Torque will be halved.
Please only type answer
For "The Atwood Machine", given the masses of the blocks (m1=2kg and m2=5kg), the mass of the pulley (M=1kg), and the radius of the pulley (R=20 cm) I would like you derive expressions for the acceleration of the system if we include the rotational motion of the pulley. Also derive expressions for the tensions involved. Explain how the acceleration would change if the system were mounted to the top of an elevator that is accelerating up at 5 m/s^2.
Chapter 18 Solutions
Tutorials in Introductory Physics
Ch. 18.1 - What is the direction of the angular velocity of...Ch. 18.1 - What is the direction of the wheel’s angular...Ch. 18.1 - Rank the magnitudes of the centripetal...Ch. 18.1 - For each situation described below, describe a...Ch. 18.1 - The equation a0andaR0 is not a correct vector...Ch. 18.2 - Prob. 1aTHCh. 18.2 - Draw an extanded freebody diagram for the ruler at...Ch. 18.2 - Rank the magnitudes of all the forces on your...Ch. 18.2 - Is the rotation of the ruler about the pivot in a...Ch. 18.2 - In the boxes at right, indicate the direction of...
Ch. 18.2 - Check that your descriptions of the motion of the...Ch. 18.2 - Parts iiv refer to the instant shown in the...Ch. 18.2 - Suppose that each force shown above is exerted for...Ch. 18.3 - What does this observation imply about the net...Ch. 18.3 - Draw an extended free-body diagram for theboard in...Ch. 18.3 - Would the board remain at rest in this case?...Ch. 18.3 - On the figure above, mark the approximate location...Ch. 18.3 - Is the amount of mass of the system (clay and...Ch. 18.3 - A T-shaped sheet of uniform thickness has a...
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