71. In ideal machines
72. In determining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than
73. A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span
74. Coplanar non-concurrent forces are those forces which __________ at one point, but their lines of action lie on the same plane.
75. Which of the following do not have identical dimensions?
76. If ‘P’ is the force acting on the body, ‘m’ is the mass of the body and ‘a’ is the acceleration of the body, then according to Newton's second law of motion,
77. The angle of inclination of the plane at which the body begins to move down the plane, is called
78. If n = number of members and y = number of joints, then for a perfect frame, n = ?
79. The velocity ratio for the third system of pulleys is
80. Dynamic friction as compared to static friction is
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