A ball moving on a smooth horizontal table hits a rough vertical wall, the coefficient of restitution between ball and wall being 1/3. The ball rebounds at the same angle. The fraction of its kinetic energy lost is 43864 44052 43839 43833 TRUE ANSWER : ? YOUR ANSWER : ?
A rod 5 m in length is moving in a vertical plane. When it is inclined at 60° to horizontal, its lower end is moving horizontally at 3 m/sec and upper end is moving in vertical direction. The velocity of its upper end, is 1.0 m/sec 0.5 m/sec 2.5 m/sec 1.5 m/sec TRUE ANSWER : ? YOUR ANSWER : ?
If two forces each equal to ‘T’ in magnitude act at right angles, their effect may be neutralized by a third force acting along their bisector in opposite direction whose magnitude will be 3 T √2 T 2 T 1/2 T TRUE ANSWER : ? YOUR ANSWER : ?
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 70 m/sec 80 m/sec 90 m/sec 75 m/sec TRUE ANSWER : ? YOUR ANSWER : ?
A hoop of radius 3 m weighs 100 kg. It rolls along a horizontal floor so that at its centre of mass has a speed of 200 mm/sec. The work required to stop the hoop is 6 J 8 J 4 J 2 J TRUE ANSWER : ? YOUR ANSWER : ?
For a non-concurrent force system to be in equilibrium None of these Only the closure of funicular polygon is sufficient Both force polygon and funicular polygon must close Only the closure of force polygon is sufficient TRUE ANSWER : ? YOUR ANSWER : ?
The pole distance is measured in force scale distance scale time scale mass scale TRUE ANSWER : ? YOUR ANSWER : ?
If two forces acting at a point are in equilibrium, they must be equal in magnitude and their line of action must be along None of these The same line in the same sense The same line in opposite sense The perpendicular to both the lines TRUE ANSWER : ? YOUR ANSWER : ?
Power developed by a torque, is 2πNT /60 watts 2πNT kg m/min All listed here 2πNT/4500 h.p TRUE ANSWER : ? YOUR ANSWER : ?