A mass of 2.9 kg is suspended from a string of length 50 cm and it is at rest . Another body of mass 0.1 kg moving horizontally with velocity 150 m / s , strikes and sticks to it . What is tension in the string , when it makes angle 60 degree with vertical ?

1 ) A mass of 2.9 kg is suspended from a string of length 50 cm and it is at rest . Another body of mass 0.1 kg moving horizontally with velocity 150 m / s  ,  strikes and sticks to it . What is tension in the string , when it makes angle 60 degree with vertical ?

Solution : -

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2 )  Formula for tension in the string is : -

T  –  mg  =  ma .

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3 ) The escape velocity from the earth’s surface is 11  km / s . A certain planet has radius twice that of earth but its mean density is the same as that of earth . The value of escape velocity from this planet would be : -

A ) 11  km / s ,                                                     B ) 22  km / s ,

C ) 43  km / s ,                                                    D ) None of these ,

Correct Answer : -   B ) 22  km / s ,

Solution : -

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