Q. For lifting a load of 50 kg through a distance of 2.5 cm, an effort of 12.5 kg is moved through a distance of 40 cm. The efficiency of the lifting machine, is

View solution

Q. Power can be expressed as

View solution

Q. A spring scale in a stationary lift shows a reading of 60 kg for a man standing on it. If the lift starts descending at an acceleration of g/5, the scale reading would be

View solution

Q. The resolved part of the resultant of two forces inclined at an angle θ in a given direction is

View solution

Q. The following statement is one of the laws of Dynamic friction

View solution

Q. A 50 kg boy climbs up a 8 m rope in gymnasiam in 10 sec. The average power developed by the boy is approximately

View solution

Q. According to Law of Triangle of Forces

View solution

Q. A Second's pendulum gains 2 minutes a day. To make it to keep correct time its length

View solution

Q. The following is not a law of static friction :

View solution

Q. The velocity of a moving body, is

View solution

Q. The resultant of the forces acting on a body will be zero if the body

View solution

Q. A ball moving with a velocity of 5 m/sec impinges a fixed plane at an angle of 45° and its direction after impact is equally inclined to the line of impact. If the coefficient of restitution is 0.5, the velocity of the ball after impact will be

View solution

Q. A pilot flies a small plane in a vertical loop of radius r. At the top of its trajectory he experiences weightlessness. If the acceleration due to gravity is g, the speed of the plane at the top of its trajectory would be

View solution

Q. A Seconds pendulum executes

View solution

Q. The following factor affects the orbit of a satellite up to an altitude of 720 km from the earth's surface

View solution

Q. Newton's law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation

View solution

Q. Two forces of 6 Newtons and 8 Newtons which are acting at right angles to each other, will have a resultant of

View solution

Q. A projectile is fired with a velocity of 100.3 m/sec. at an elevation of 60°. The velocity attained by the projectile when it is moving at a height of 100 m, is

View solution

Q. For maximum range of a projectile, the angle of projection should be

View solution

Q. A particle moves with a velocity of 2 m/sec in a straight line with a negative acceleration of 0.1 m/sec². Time required to traverse a distance of 1.5 m, is

View solution