1.

Suppose the gravitational force varies inverselyas the nth power of distance. Then the time period of planet in circular orbit of radius R around the sun will be proportional to ..........

Answer»

`R^(((n+1)/2))`
`R^(((n-1)/2))`
`R^n`
`R^(((n-2)/2))`

Solution :`implies` Gravitational FORCE `F prop 1/r^n`
`:. F = k/r^n`
For ORBIT of radius R
`F = k/(R^n)`
but `F = momega^2R`
`:.k/(R^n)=mR((2PI)/T)^2`
`:. k/(R^(n+1)) = (m(2pi)^2)/T^2 `
`:. T^(2) prop R^(n+1)`
`:. T prop R^((n+1)/2)`


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