EBK UNDERSTANDING OUR UNIVERSE (THIRD E
3rd Edition
ISBN: 9780393631760
Author: Blumenthal
Publisher: VST
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Chapter 15, Problem 1QAP
To determine
The given statement true or false.
Expert Solution & Answer
Answer to Problem 1QAP
False.
Explanation of Solution
The stars which are closer to the center of the galaxy moves at higher speed and the stars which are far away from the center of the galaxy moves at slow speed.
The hypothesis that the mass and light are distributed in the same way is proved wrong. The rotational velocity of the stars is found to be much higher than the amount of light present in that region. This result concluded that there are some other mass present which contribute for the speed of rotation.
The rotation curve shows that the stars at the end of galaxy also rotate with much higher speed than the luminous mass present there.
Conclusion:
Thus, the given statement is false.
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Figure 27-65 Problem 63.
Thor flies by spinning his hammer really fast from a leather strap at the end of the handle, letting go, then grabbing it and having it pull him. If Thor wants to reach escape velocity (velocity needed to leave Earth’s atmosphere), he will need the linear velocity of the center of mass of the hammer to be 11,200 m/s. Thor's escape velocity is 33532.9 rad/s, the angular velocity is 8055.5 rad/s^2. While the hammer is spinning at its maximum speed what impossibly large tension does the leather strap, which the hammer is spinning by, exert when the hammer is at its lowest point? the hammer has a total mass of 20.0kg.
If the room’s radius is 16.2 m, at what minimum linear speed does Quicksilver need to run to stay on the walls without sliding down? Assume the coefficient of friction between Quicksilver and the wall is 0.236.
Chapter 15 Solutions
EBK UNDERSTANDING OUR UNIVERSE (THIRD E
Ch. 15.1 - Prob. 15.1CYUCh. 15.2 - Prob. 15.2CYUCh. 15.3 - Prob. 15.3CYUCh. 15.4 - Prob. 15.4CYUCh. 15 - Prob. 1QAPCh. 15 - Prob. 2QAPCh. 15 - Prob. 3QAPCh. 15 - Prob. 4QAPCh. 15 - Prob. 5QAPCh. 15 - Prob. 6QAP
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