41. What is the work done in bringing a body of mass m from infinity to the surface of the earth? 42. What is the unit of intensity of the gravitational field ? 43. What is the value of gravitational potential energy at infinity? 44. What is the value of the gravitational intensity at the earth's surface and at the earth's centre ? 45. What is the relation between gravitational intensity and gravitational potential at a point ? 46. Why is gravitational potential energy negative? 47. The gravitational potential energy of a body at a distance r from the centre of the earth is U. What is the weight of the body at that point ? 48. From where does a satellite get centripetal force for moving around its planet ? 49. What is escape velocity ? Write down its minimum value on the surface of the earth.
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Answer:What is the work done in bringing a body of mass m from infinity to the surface of the earth? 42. What is the unit of intensity of the gravitational field ? 43. What is the value of gravitational potential energy at infinity? 44. What is the value of the gravitational intensity at the earth's surface and at the earth's centre ? 45. What is the relation between gravitational intensity and gravitational potential at a point ? 46. Why is gravitational potential energy negative? 47. The gravitational potential energy of a body at a distance r from the centre of the earth is U. What is the weight of the body at that point ? 48. From where does a satellite get centripetal force for moving around its planet ? 49. What is escape velocity ? Write down its minimum value on the surface of the earth.
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