My Math Forum How Earth maintain its same angular momentum even after sun disappears?

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 July 9th, 2019, 07:15 AM #1 Senior Member   Joined: Aug 2014 From: India Posts: 409 Thanks: 1 How Earth maintain its same angular momentum even after sun disappears? How Earth maintain its same angular momentum even after sun disappears ?
 July 9th, 2019, 07:30 AM #2 Senior Member   Joined: Apr 2014 From: UK Posts: 936 Thanks: 335 The sun is still there, you just can't always see it from where you are.
 July 9th, 2019, 08:08 AM #3 Math Team     Joined: Jul 2011 From: Texas Posts: 2,980 Thanks: 1573
July 9th, 2019, 08:10 AM   #4
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Quote:
 Originally Posted by Ganesh Ujwal How Earth maintain its same angular momentum even after sun disappears ?
You... actually think the sun disappears at night?

 July 9th, 2019, 08:23 AM #5 Member   Joined: Jun 2019 From: USA Posts: 69 Thanks: 27 Some context is definitely needed. Are we talking about the sun being magically compressed into a black hole? The sun magically disappearing? The angular momentum of the Earth revolving around the sun, or spinning about its own axis? Thanks from topsquark
 July 9th, 2019, 10:05 PM #6 Senior Member   Joined: Aug 2014 From: India Posts: 409 Thanks: 1 @2:28 He explains Earth maintain its same angular momentum even after sun disappears. I didn't get it.
July 9th, 2019, 10:44 PM   #7
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 Originally Posted by Ganesh Ujwal @2:28 He explains Earth maintain its same angular momentum even after sun disappears. I didn't get it.
A force that goes radially inwards (like gravity) produces no torque. So whether the force is there or not, the torque is 0.

July 10th, 2019, 07:08 AM   #8
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 Originally Posted by Micrm@ss A force that goes radially inwards (like gravity) produces no torque. So whether the force is there or not, the torque is 0.
I am asking about How Earth maintain its same angular momentum even after sun disappears?

July 10th, 2019, 12:16 PM   #9
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Quote:
 Originally Posted by Ganesh Ujwal I am asking about How Earth maintain its same angular momentum even after sun disappears?
What Micrm@ss is saying is that the Sun produces no torque on the Earth, so if the Sun is suddenly not there angular momentum is conserved and the angular momentum of the Earth will not change.

-Dan

July 10th, 2019, 12:39 PM   #10
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Quote:
 Originally Posted by Ganesh Ujwal I am asking about How Earth maintain its same angular momentum even after sun disappears?
And that is what I'm answering.

What is the relation between torque and angular momentum?

 Tags angular, disappears, earth, maintain, momentum, sun

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