The height at which the weight of a body becomes 1/16 th, its weight
The height at which the weight of a body becomes 1/16 th, its weight on the surface of earth (radius R), is
Options
(a) 5 R (b) 15 R (c) 3 R (d) 4 […]
Gravitation
The depth at which the effective value of acceleration due to gravity is g/4
The depth at which the effective value of acceleration due to gravity is g/4 is (R=Radius of earth)
Options
(a) R (b) 3R/4 (c) R/2 (d) R/4
Correct Answer:
3R/4
Explanation:
The effect of […]
Weight of a body of mass m decreases by 1% when it is raised to height h
Weight of a body of mass m decreases by 1% when it is raised to height h above the earth’s surface. If the body is taken to a depth h in a mine, change in […]
A particle of masses m is thrown upwards from the surface of the earth, with a velocity u
A particle of masses m is thrown upwards from the surface of the earth, with a velocity u. The mass and the radius of the earth are, respectively, M and R. G is gravitational constant […]
A planet moving along an elliptical orbit is closest to the sun at a distance of r₁
A planet moving along an elliptical orbit is closest to the sun at a distance of r₁. If v₁ and v₂ are the linear velocities at these points respectively then the ratio v₁ / v₂ […]
Two spheres of mass m and M are situated in air and the gravitational force
Two spheres of mass m and M are situated in air and the gravitational force between them is F. The space around the masses is now filled with a liquid of specific gravity 3. The […]
A particle of mass M is suited at the centre of a spherical shell of same mass and radius
A particle of mass M is suited at the centre of a spherical shell of same mass and radius a. The gravitational potential at a point situated at a/2 distance from the centre, will be: […]
The radii of circular orbits of two satellites A and B of the earth, are 4R and R
The radii of circular orbits of two satellites A and B of the earth, are 4R and R respectively. If the speed of satellite A is 3 V, then the speed of satellite B will […]
Two satellites of earth, S₁ and S₂ are moving in the same orbit. The mass of S₁
Two satellites of earth, S₁ and S₂ are moving in the same orbit. The mass of S₁ is four times the mass of S₂. Which one of the following statements is true?
Options
The kinetic energy needed to project a body of mass m from the surface of earth
The kinetic energy needed to project a body of mass m from the surface of earth (radius R) to infinity is
Options
(a) mgR/2 (b) 2mgR (c) mgR (d) mgR/4
Correct Answer:
mgR