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Confused! kindly explain, The earth revolves about the sun in an elliptical orbit with mean radius 9.3×107m in a period of 1 year. Assuming that there are no outside influences

The earth revolves about the sun in an elliptical orbit with mean radius 9.3×107m in a period of 1 year. Assuming that there are no outside influences

  • Option 1)

    Earth’s kinetic energy remains constant

  • Option 2)

    Earth’s angular momentum remains constant

  • Option 3)

    Earth’s potential energy remains constant

  • Option 4)

    all of the above

 
Answers (1)
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As we learnt in 

Lift accelerating down with 'a' -

V= variable

a<g

mg-R=ma

R=m(g-a)

- wherein

Apparent weight  <  Actual weight

 

 Force exerted by the block A on the block B is 

N=m(g-a)=0.5(10-2)

N=0.5\times8=4N

 

 

 

 


Option 1)

Earth’s kinetic energy remains constant

This option is incorrect.

Option 2)

Earth’s angular momentum remains constant

This option is correct.

Option 3)

Earth’s potential energy remains constant

This option is incorrect.

Option 4)

all of the above

This option is incorrect.

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