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Interplanetary distances are measured in...

Interplanetary distances are measured in ____
a) Light year
b) Kilometer
c) Megameter
d) Watt

Text Solution

Verified by Experts

The correct Answer is:
A, B, C
a. Net force on the spring balance,
`R=mg=momega^2r`
So, fraction less than the true weight (3mg) is
`=(mg-(mg-momega^2r))/(mg)`
`(omega^2)/g((2pi)/(24xx3600))^2
`=(6500xx10^3)/10`
when the balance reading is half the true weight
`(mg-momega^2r)/(mg)=1/2`

omega^2r=g/2`
`rarr omega=sqrt(g/(2r)`
`=sqrt(10/(2xx6400xx10^3))` rad/sec
`Duration of the day is `
`T=(2pi)/omega`
`=2pixxsqrt((2xx6400xx10^3)/9.8` sec
`2pisqrt((64xx10^5)/49)sec`
`=(2pixx8000)/(7xx3600)hr=2hr`
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