Physics for competitive exams – 08

81. When a man cycles round the earth in a satellite, then his ---- both mass and weight remain constant.

82. A satellite moving round the earth with a uniform speed has ----- no acceleration at all

83. An artificial earth satellite is said to be in a geostationary orbit when ----- it remains stationary in relation to some point on the earth

84. A stone dropped from the top of the building passes a window 1.5 m high, 10 m. below it. Then the correct value of the time taken by the ball to pass the window is (nearly) – 0.1 second

85. Which law is involved in the act of cleaning a carpet by beating it with a stick? --- First law of motion

86. A cricketer lowers his hand while catching the ball. This saves him from injury because of ---- Conservation of momentum

87. An artificial satellite stays in the orbit around the earth because --- the earth’s attraction produces the necessary centripetal acceleration

88. For a given velocity of projection, the maximum range of a projectile can be achieved if the angle of projection is --- 45⁰

89. The cause of weightlessness experienced while orbiting around earth on a spaceship? --- Zero gravity

90. Work energy theorem ------ work done by all the forces on a particle is equal to its change in kinetic energy