51. Acceleration due to gravity g = . . . . . . . .
52. What will be the ratio of acceleration due to gravity at a depth 'h' below the surface of the earth and a height 'h' above the surface of earth where, Re is the radius of the earth, h << Re-
53. A car falls from the bridge to the ground in 0.8 seconds. What will be its speed at the time of hitting the ground? given (g) = 10ms-2
54. Which of the following statements is true?
1. The value of 'g' on Mount Everest is > g
2. The value of 'g' on Mount Everest is < g.
3. After 15 seconds a ball is thrown vertically and returns to the ground. Its velocity is 75 m/s.
4. A ball is returned to the ground after 15 seconds when thrown vertically. Its velocity is 150 m/s.
1. The value of 'g' on Mount Everest is > g
2. The value of 'g' on Mount Everest is < g.
3. After 15 seconds a ball is thrown vertically and returns to the ground. Its velocity is 75 m/s.
4. A ball is returned to the ground after 15 seconds when thrown vertically. Its velocity is 150 m/s.
55. If the distance between two particles increases, what is the effect on the force of gravitational between them?
56. The distance travelled in 2s independently of a body falling freely will be . . . . . . . .
57. Consider the following statements. The acceleration due to earth's gravity decreases if
1. we go up from the surface of the earth.
2. we go from the equator towards the pole.
3. the rotation speed of the earth is increased.
4. we go down from the surface of the earth towards its centre.
Which of these statements are correct?
1. we go up from the surface of the earth.
2. we go from the equator towards the pole.
3. the rotation speed of the earth is increased.
4. we go down from the surface of the earth towards its centre.
Which of these statements are correct?
58. When two eggs are dropped from a certain height in such a way that one egg falls on the floor and the other on the pillow, which of the following will not be a possible outcome?
59. The minimum number of geo-stationary satellites needed for uninterrupted global coverage
60. What is the escape velocity for the Earth?
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