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.
Expert Solution & Answer
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Students have asked these similar questions
Calculate the torque using the moment arm. (Only using a vertical line and ruler.)
Hint:
Show your work, as usual, start with the equation in symbols, then put in the numbers with units all the way through. If you don't know how to use the equation formatting please handwrite your calculation and upload the image (upright and cropped appropriately).
Please solve all i know Bartelby rules but solve all questions.
Qno1 . A sanding disk with rotational inertia 9.0x 103 kg-m is attached to an electric drill whose motor delivers a torque of magnitude 43 N-m about the central axis of the disk. About that axis and with torque applied for 52 ms, what is the magnitude of the (a) angular momentum and (b) angular velocity of the disk?
a) numbers (?) Units (?)
b) numbers (?) Units(?)
2) A wheel starts from rest and has an angular acceleration that is given by a (t)-6 rad/s) The angle through which it turns in time t is given by:
a) ((1/8)trad/s⁴
b) ([1/4]r" rad/s⁴
c) ((1/2)trad/s⁴
d) ((t") rad/s²
c) 12rad
3) A disk, initially rotating at 144 rad/s, is slowed down with a constant angular acceleration of magnitude 3.75 rad/s². (a) How much time does the disk take to stop? (b) Through what angle (rad) does the disk rotate during that time?
a) numbers(?) Units(?)
b) numbers (?) Unjts(?)
4) Ameter stick balances horizontally on a knife-…
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.
Chapter 4 Solutions
Tutorials in Introductory Physics
Ch. 4.1 - Draw arrows on the diagram to represent the...Ch. 4.1 - Mark the position of each of the labeled points at...Ch. 4.1 - Suppose the wheel makes one complete revolution in...Ch. 4.1 - Would two observers on either side of a rotating...Ch. 4.1 - The diagrams at right show top and side views of...Ch. 4.1 - In the space at right sketch the position vectors...Ch. 4.1 - Let | in terms of |o| . 1. The wheel is made to...Ch. 4.1 - Suppose the wheel slows down uniformly, so that ||...Ch. 4.1 - A force of magnitude Fo is applied to point M as...Ch. 4.1 - Compare the magnitude of the net torque about the...
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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