81. What is the path of revolving motion of planet?
82. What would be the minimum energy required to launch a satellite of m kg from the Earth's surface in a circular orbit at an altitude of 2R? The radius of the Earth is R.
83. Two stones of different masses are dropped simultaneously from the top of a building,
84. The magnitude of the gravitational force will be equal to the . . . . . . . .
85. If an object is falling from above, its weight remains
86. The force of gravity between any two bodies in the universe does not depend on . . . . . . . .
87. What do the terms Geocentric and Heliocentric refer to-
88. Earth attracts things towards itself this is due to . . . . . . . .
89. If the mass of an object is 600 kgs, what will be its weight on the moon? (N = Newton)
90. The Earth travels in its orbit at a speed of approx. 4,400 km per hour. Why do we not feel this high speed?
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