### Gravitation

Gravitation

**Physics**subject

**,**Chapter

**Gravitation**knowledge.

The masses of two planets are in the ratio 1 : 2. Their radii are in the ratio 1 : 2. The acceleration due to gravity on the planets are in the ratio.

The time – period of a satellite of earth is 5 hours. If the separation between the earth and the satellite is increased to 4 times the previous value, the new time – period will become

A body weighs 500 N on the surface of the earth. How much would it weight half way below the surface of the earth?

The mean radius of the earth is R, its angular speed on its own axis is w and the acceleration due to gravity at earths surface is g. The cube of the radius of the orbit of a geo-stationary satellite will be

The value of g at a particular point is 9.8 m/sec² suppose the earth suddenly shrink uniformly to half its present size without losing any mass. The value of g at the same point (assuming that the distance of the point from the centre of the earth does not shrink) will become

A body is projected vertically from the surface of the earth of radius R with velocity equal to half of the escape velocity. The maximum height reached by the body is

A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is

A artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) energy E0. Its potential energy is

A body is projected vertically from the surface of the earth of radius R with velocity equal to half of the escape velocity. The maximum height reached by the body is

A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is

If the radius of the earth were to be raise by 1% its mass remaining the same, the acceleration due to gravity on the surface of the earth will

A satellite S is move in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth.

The radius of the earth is 6400 km and g = 10 m/s². In order that a body of 5 kg weighs zero at the equator, the angular speed of the earth is

There is no atmosphere on the moon because

The escape velocity of projection from the earth is approximately (R = 6400 km)

The escape velocity for a body projected vertically upwards from the surface of the earth is 11 km/s. If the body is projected at an angle of 450 with the vertical, the escape velocity will be

Who among the following first gave the experimental velocity of G?

What would be the duration of the year if the distance between the earth and the sun gets doubled?

If a body of mass m is taken out from a point below the surface of earth equal to half the radius of earth, R, to a height R above the earths surface, then work done on it will be

If the distance between the earth and the sun were half its present value, the number of day in a year would have been

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## Try other Chapter

- Chapter 1: Physical World.
- Chapter 2: Units and Measurement.
- Chapter 3: Motion in a Straight Line.
- Chapter 4: Motion in a Plane.
- Chapter 5: Laws of Motion.
- Chapter 6: Work, Energy and Power.
- Chapter 7: System of Particles and Rotational Motion.
- Chapter 9: Mechanical Properties of Solids.
- Chapter 10: Mechanical Properties of Fluid.
- Chapter 11: Thermal Properties of Matter.
- Chapter 12: Thermodynamics.
- Chapter 13: Kinetic Theory of gases.
- Chapter 14: Oscillations.
- Chapter 15: Waves.