21. A 49 kg lady stands on a spring scale in an elevator. During the first 5 sec, starting from rest, the scale reads 69 kg. The velocity of the elevator will be
22. Minimum pull in a suspended cable with supports at two ends is equal to
23. Pick up the correct statement from the following. The kinetic energy of a body
24. The force polygon representing a set of forces in equilibrium is a
25. A system of coplanar forces is in equilibrium when
26. In which of the following trusses, the method of substitution is required for determining the forces in all the members of the truss by graphic statics?
27. One end of a light string 4 m in length is fixed to a point on a smooth wall and the other end fastened to a point on the surface of a smooth sphere of diameter 2.25 m and of weight 100 kg. The tension in the string is
28. A weight of 100 kg is supported by a string whose ends are attached to pegs ‘A’ and ‘B’ at the same level shown in below figure. The tension in the string is
29. A 50 kg boy climbs up a 8 m rope in gymnasium in 10 sec. The average power developed by the boy is approximately
30. Two parallel forces 20 kg and 15 kg act. In order that the distance of the resultant from 20 kg force may be the same as that of the former resultant was from 15 kg, the 20 kg force is diminished by
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