71. Which force maintains the structure of our solar system?
72. Suppose there is a planet whose mass and radius are twice the mass and radius of the Earth. The acceleration due to gravity on the surface of that planet is n times that of Earth. What will be the value of n:
73. Suppose an imaginary planet whose mass and radius are equal to half of the Earth. If the acceleration due to gravity on the Earth's surface is g, then what will be the acceleration due to gravity on that planet:
74. The weight of an object on the earth is 150 N. Its weight on moon will be
75. What will be the mass of the object whose weight on Earth is 196 N? (g = 9.8 ms-2)
76. A stone is tied with a spring balance, which of the following situations would show the lowest load in the spring in balance reading?
77. Two balls A and B are of 10 kg and 1 kg, respectively. They are dropped simultaneously from a height of 20 m. Which of the following is correct?
78. A car slips down the mountain pass and falls down, it takes 0.7 seconds to reach the ground. What will be its speed while hitting the ground?
79. If the mass of an object is 60 kg on the surface of the Earth, what will be its mass on the Moon?
80. Which one of the following statement about the mass of a body is correct?
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