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Author Question: Some students are discussing why a simple Atwood machine accelerates. Jane says that because of ... (Read 47 times)

xroflmao

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on: Jul 29, 2018
Some students are discussing why a simple Atwood machine accelerates.
 
  Jane says that because of the unequal masses, gravity exerts a constant external torque on the two-mass and pulley system and thus its total angular momentum increases at a constant rate. Is Jane's explanation a valid one?

Question 2

The attraction of the Moon causes tides on Earth. Because of friction, tidal action slows the rotation of Earth. What happens to the angular momentum of the Earth-Moon system, and does this affect the motion of the moon?
 
  What will be an ideal response?


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joshbk44

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Reply #1 on: Jul 29, 2018
Answer to Question 1

Yes

Answer to Question 2

Since there are no external torques, the angular momentum is conserved. Since the Moon revolves around Earth in the same direction as Earth rotates, this means that the Moon's angular momentum about the center of mass of the Earth-Moon system has to increase.


xroflmao

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Reply 2 on: Jul 29, 2018
Great answer, keep it coming :)

mohan

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Reply 3 on: Yesterday
:D TYSM

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