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 \(\left(6 \hat{i}+8\hat j\right)\) and \(\left(4 \hat{i}+4\hat j \right)\)N are acting on a body of mass \(2\) kg, then the acceleration produced in the body (in \(\text{m/s}^{2}\)) will be:
1. \(\left(5 \hat{i}+6\hat j\right)\)
2. \(\left(10 \hat{i}+12\hat j\right)\)
3. \(\left(6 \hat{i}+12\hat j\right)\)
4. \(\left(2 \hat{i}+3\hat j\right)\)
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 \(\theta\) 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. \(Mg+ Ma\cos\theta\)
2. \(Mg- Ma\cos\theta\)
3. \(Mg+ Ma\tan\theta\)
4. \(Mg- Ma\tan\theta\)
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. \(mg-\frac{mv^{2}}{R}\)
2. \(mg+\frac{mv^{2}}{R}\)
3. \(mg\)
4. \(\frac{mv^{2}}{R}\)
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 |
Two blocks, \(A\) and \(B\), of masses \(2m\) and \(4m\) are connected by a string. The block of mass \(4m\) is connected by a spring (massless). The string is suddenly cut. The ratio of the magnitudes of accelerations of masses \(2m\) and \(4m\) at that instant will be:
1. | \(1:2\) | 2. | \(2:1\) |
3. | \(1:4\) | 4. | \(4:1\) |