The escape velocity for a rocket from earth is 11.2kms^-1 value on a planet where acceleration due to gravity is double that on earth and diameter of the planet is twice that of earth will be...km^-1

The escape velocity of a sphere of mass m from earth having mass M and Radius R is given by

A particle falls towards earth from infinity. It's velocity reaching the earth would be……

Radius of orbit of satellite of earth is R. Its  K.E is proportional to

Energy required to move a body of mass m from an orbit of radius 2R to  3R is

A body is projected vertically upwards from the surface of a planet of radius R with a velocity equal to half the escape velocity for that planet. The maximum height attained by the body is….

The Gravitational P.E of a body of mas m at the earth's surface is -mg Re. Its gravitational potential energy at a height Re from the earth's surface will be = here (Re is the radius of the earth),

The Gravitational P.E of a body of mas  at the earth's surface is -mg Re. Its gravitational potential energy at a height Re from the earth's surface will be = here (Re is the radius of the earth),

Escape velocity of a body of 1 kg. on a planet is 100ms^-1 . Gravitational potential energy of the body at the planet is =.....j

What is the intensity of gravitational field at the center of spherical shell

A rocket is launched with velocity 10. If radius of earth is R then maximum height attained by it will be =…….

The masses and radius of earth and moon are M₁ ,R₁ and M₂ R₂ respectively. Their centres are d distance of apart. The minimum velocity with which a particle of mass  should be projected from a point mid way between their centres so that it escapes to infinity is……

If P= where percentage error in and are respectively and then total percentage error in measurement of

The mass of the earth is 6.00 Kg and that of the moon is 7.40 kg. The constant of gravitation  G=6.667Nm^-2 kg^--2.The potential energy of the system is -7.79 Joules. the mean distance between the earth and moon is =

 is perpendicular to , then

For this question, we should know the rules of dot product.

The acute angle made by the line joining the points and with the -axis is

We should remember the formula of direction cosines of all the angles.