A body weighs 200 N on the surface of the earth how much will it weigh at half way down to the center of the earth ?
The work done to raise a mass m from the surface of the earth to a height h, which is equal to the radius of the earth is :
An artificial satellite is moving around earth in a circular orbit with speed equal to one fourth the escape speed
of a body from the surface of earth. The height of satellite above earth's surface is (R is radius of earth)
Please explain me "Universal gravitational constant".
If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following is not correct ?
Time period of a simple pendulum on the Earth would decrease.
Walking on the ground would become more difficult.
Raindrops will fall faster.
'g' on the Earth will not change.
The kinetic energies of a planet in an elliptical orbit about the Sun, at positions A, B and C are KA, KB and KC, respectively. AC is the major axis and SB is perpendicular to AC at the position of the Sun S as shown in the figure. Then
Two spherical bodies of mass M and 5 M and radii R and 2R released in free space with initial separation between their centres equal to 12 R. If they attract each other due to gravitational force only, then the distance covered by smaller body before collision is
The radii of circular orbits of two satellites A and B of the earth, are 4 R and R, respectively. If the speed of satellite A is 3 V, then the speed of satellite B will be:
Dependence of intensity of gravitational field (E) of earth with distance (r) from centre of earth is correctly represented by
A planet moving along an elliptical orbit is closest to the sun at a distance of and farthest away at a distance of r2. If and are the linear velocities at these points respectively, then the ratio is
A particle of mass 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 and g is acceleration due to gravity on the surface of the earth. The minimum value of u so that the particle does not return back to earth is
A particle of mass M is situated at the centre of a spherical shell of same mass and radius a. The gravitational potential at a point situated at distance frim the centre, will be:
A black hole is an object whose gravitational field is so strong that even light cannot escape from it. To what approximately radius would earth (mass=5.98X) have to be compressed to be a black hole?
The ratio of escape velocity of earth to the escape velocity at a planet whose radius and mean density are twice as that of earth is:
1 : 2
1 : 4
Starting from the centre of the earth having radius R, the variation of g (acceleration due to gravity) is shown by
At what height from the surface of earth the gravitation potential and the value of g are -5.4 107 J kg-2 and 6.0ms-2 respectively? Take the radius of earth as 6400 km:
Two astronauts are floating in gravitational free space after having lost contact with their spaceship. The two will:
keep floating at the same distance between them.
move towards each other.
move away from each other.
will become stationary.
A satellite of mass m is orbiting the earth (of radius R) at a height h from its surface. The total energy of the satellite in terms of g0, the value of acceleration due to gravity at the earth's surface, is