Mechanics> grav15...

If the distance between earth and sun were reduced to half of its present value , then the number of days in one year would have been

a) 65

b) 129

c) 183

d) 730

Arnab Mandal , 14 Years ago

Grade 11

4 Answers

Ashwin Muralidharan IIT Madras

Hi Arnab,

The ratio of the time periods would be {new is say T1, actual is say T2}

Note that T is directly proportional to √(R³)

T1/T2 = √([R/2]³)/√(R³) = 1/(2√2)

Hence T1 = T2/2√2 = 365/2√2

Which is approx 129 days.

Option (B)

Hope that helps.

Best Regards,

Ashwin (IIT Madras).

Approved

Last Activity: 14 Years ago

nikhil manali

no its wrong option as it is approx to 183 days

Last Activity: 14 Years ago

nikhil manali

yup it is wright ans

Last Activity: 14 Years ago

Ritik

Yah.. ans is B . It can be solved by kepler`s third law . Which is T^2 proportional to R^3. Where To is period of revolution and R is distance.

Last Activity: 8 Years ago

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Mechanics> grav15...

If the distance between earth and sun were reduced to half of its present value , then the number of days in one year would have been a) 65 b) 129 c) 183 d) 730

Arnab Mandal , 14 Years ago

Ashwin Muralidharan IIT Madras

nikhil manali

nikhil manali

Ritik

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