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The escape velocity from the earth is ab...

The escape velocity from the earth is about 11 km/s. The escape velocity from a planet having twice the radius and the twice mean density as the earth, is

A

31 km/s

B

11 km/s

C

22 km/s

D

15.5 km/s

Text Solution

Verified by Experts

The correct Answer is:
a
`(v_(e_(2)))/(v_(e_(1)))=(R_(2))/(R_(1))sqrt((rho_(2))/(rho_(1)))=2sqrt2`
`=2xx11xxsqrt2=22xx1.414=31.108`
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