71. The ratio of static friction to dynamic friction is always
72. If a suspended body is struck at the center of percussion, then the pressure on die axis passing through the point of suspension will be
73. Which of the following statement is correct in connection with projectiles?
74. The periodic time of one oscillation for a simple pendulum is (where $$l$$ = Length of the pendulum.)
75. The velocity ratio for the first system of pulleys is (where n is the number of pulleys.)
76. Static friction is always __________ dynamic friction.
77. The center of gravity of a quadrant of a circle lies along its central radius (r) at a distance of
78. The C.G. of a plane lamina will not be at its geometrical centre in the case of a
79. A framed structure is imperfect, if the numbers of members are __________ (2j - 3).
80. The units of moment of inertia of an area are
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