71. At which of the following places is the gravitational acceleration zero?
72. Which one of the following statements regarding artificial satellite of the earth is incorrect?
73. Gravitational field intensity is
74. Why is weightlessness experienced while orbiting the earth in space ships?
75. The laws which govern the motion of planets are called
76. Who was the first to experimentally determine the value of the Universal Gravitational Constant (G)?
77. Which of the following statements is/are false?
1. The value of G is the same as its value on the moon, on Earth.
2. The gravitational force between the centers of two masses of 2 kg placed at a distance of 1m is 26.68 × 10-11 Nm2/kg2.
3. The force is inversely proportional to the square of the distance between the two objects.
4. The force of gravity between two objects doubles when the distance between them is halved.
1. The value of G is the same as its value on the moon, on Earth.
2. The gravitational force between the centers of two masses of 2 kg placed at a distance of 1m is 26.68 × 10-11 Nm2/kg2.
3. The force is inversely proportional to the square of the distance between the two objects.
4. The force of gravity between two objects doubles when the distance between them is halved.
78. Who propounded the universal law of gravitation?
79. The mass of a body on the Earth is 100 kg (acceleration due to gravity, ge = 10 m/s2). If acceleration due to gravity on the Moon is (ge = 106 m/s2), then the mass of the body on the Moon is
80. A ball is dropped from the top of a high building with a constant acceleration of 9.8 m/s2. What will be its velocity after 3 s?
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