71. The dimensions of power are
72. The Law of Polygon of Forces states that
73. A cube on a smooth horizontal surface
74. The mechanical advantage of an ideal machine is 100. For moving the local through 2 m, the effort moves through
75. The rate of change of displacement of a body with respect to its surrounding, is known
76. A train weighing 196 tonnes experiences a frictional resistance of $$5\frac{{11}}{{22}}$$ per tonne. The speed of the train at the top of a down gradient 1 in 78.4 is 36 km/hour. The speed of the train after running 1 km down the slope, is
77. A trolley wire weighs 1 kg per metre length. The ends of the wire are attached to two poles 20 m apart. If the horizontal tension is 1000 kg, the central dip of the cable is
78. A particle moves along a straight line such that distance ‘x’ traversed in ‘t’ seconds is given by x = t2(t + 1), the acceleration of the particle, will be
79. A Seconds pendulum executes
80. The forces which meet at one point and have their lines of action in different planes are called
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