81. A 40 kg girl quickly climbs up the stairs to 5m height in 4 sec, what will be the power developed by her?
82. Which physical quantity is represented by the ratio of momentum and velocity of the body?
83. Which of the following does not affect the value of acceleration due to gravity?
84. A bullet of mass 12 g is fired from a rifle. The bullet takes 0.006 second to move through its barrel and leaves it with a velocity of 300 m/s. What is the force exerted on the bullet by the rifle?
85. When an object of 12kg is at a height of 5m from the ground, then the energy contained in it will be? (g = 9.8ms-2)
86. The product of mass and velocity is called:
87. An object of 20kg mass is moving at speed of 10m/s. What is the kinetic energy obtained by the object?
88. In wind power, which form of energy is converted into electrical energy?
89. Which one among the following happens when a swing rises to a certain height from its rest positions?
90. A 4.0 kg object is moving horizontally with a speed of 5.0 m/s. To increase its speed to 10 m/s, the amount of net work required to be done on this object is:
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