A block slides down on a 45° rough incline in thrice the time it takes to slide down on a frictionless 45° incline of the same length. The coefficient of friction between the block and the rough incline is:
1. | 0.6 | 2. | 0.7 |
3. | 0.5 | 4. | 0.9 |
The kinetic energy 'K' of a particle moving in a circular path varies with the distance covered S as K = a, where a is constant. The angle between the tangential force and the net force acting on the particle is: (R is the radius of the circular path)
1.
2.
3.
4.
The tension in the string connecting blocks, B and C, placed on a smooth horizontal surface in the following diagram is:
1. | 25 N | 2. | 30 N |
3. | 32.5 N | 4. | 37.5 N |
If two forces ( ) and ( ) N are acting on a body of mass 2 kg, then the acceleration produced in the body in will be:
1. ( )
2. ( )
3. ( )
4. ( )
The friction between the front foot and the back foot when walking on a horizontal surface is, respectively:
1. Forward, forward
2. Backward, backward
3. Forward, backward
4. Backward, forward
A simple pendulum hangs from the roof of a train moving on horizontal rails. If the string is inclined towards the front of the train, then the train is:
1. moving with constant velocity.
2. in accelerated motion.
3. in retarded motion.
4. at rest.
A block of mass M is pulled by a force F, making an angle with the horizontal on a smooth horizontal surface as shown. If a is the acceleration of block on the surface, then the contact force between the block and the surface will be:
1. Mg + Macos
2. Mg - Macos
3. Mg + Matan
4. Mg - Matan
A body of mass m is moving on a concave bridge ABC of the radius of curvature R at a speed v. The normal reaction of the bridge on the body at the instant it is at the lowest point of the bridge is:
1.
2.
3. mg
4.
A block B of mass \(3\) kg is kept on block A of mass \(5\) kg in a lift accelerating upward with an acceleration of \(g.\) The reaction by A on B is:
1. | \(10g\) | 2. | \(16g\) |
3. | \(4g\) | 4. | \(6g\) |
If the force acting on a system is zero, the quantity which remains constant is:
1. | Force | 2. | Linear momentum |
3. | Speed | 4. | Kinetic energy |