21. A car goes round a curve of radius 100 m at 25 m/sec. The angle to the horizontal at which the road must be banked to prevent sideways friction on the car wheels is tan-1x, where x is (Assume g = 10 m/sec2)
22. A stone was thrown vertically upwards from the ground with a velocity of 50 m/sec. After 5 seconds another stone was thrown vertically upwards from the same place. If both the stones strike the ground at the same time, then the velocity with which the second stone was thrown should be (Assume g = 10 m/sec2)
23. A block in the shape of a parallelepiped of sides 1m × 2m × 3m lies on the surface. Which of the faces gives maximum stable block?
24. ‘u1’ and ‘u2’ are the velocities of approach of two moving bodies in the same direction and their corresponding velocities of separation are ‘v1’ and ‘v2’. As per Newton's law of collision of elastic bodies, the coefficient of restitution (e) is given by
25. A retarding force on a body does not
26. Power can be expressed as
27. The ratio of the reactions RA and RB of a simply supported beam shown in below figure is
28. The reaction at the support B of the beam shown in below figure is
29. The reaction at the support D of the continuous beam ABCD, hinged at two points shown in below figure is
30. The reaction at the central support B of the beam ABC hinged at D shown in below figure is
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