A force of 5 N making an angle with the horizontal acting on an object displaces it by 0.4 m along the horizontal direction. If the object gains kinetic energy of 1 J then the component of the force is:
1. | 1.5 N | 2. | 2.5 N |
3. | 3.5 N | 4. | 4.5 N |
A block of mass \(2\) kg moving with a velocity of \(10\) m/s on a smooth surface hits a spring of force constant \(80\times10^3\) N/m as shown in the figure. The maximum compression in the spring will be:
1. \(5\) cm
2. \(10\) cm
3. \(15\) cm
4. \(20\) cm
A block of mass m initially at rest, is dropped from a height h onto a spring of force constant k. If the maximum compression in the spring is x, then:
1.
2.
3.
4.
1. | no work is done by the tangential force. |
2. | no work is done by the centripetal force. |
3. | work done by the tangential force is always positive. |
4. | work done by the centripetal force is negative. |
What is the work done by gravity on block A in 2 seconds after the blocks are released? (Pulley is light)
1. 240 J
2. 200 J
3. 120 J
4. 24 J
A weight 'mg' is suspended from a spring. The energy stored in the spring is U. The elongation in the spring is:
1.
2.
3.
4.
1. \(50~\text{J}\)
2. \(100~\text{J}\)
3. \(25~\text{J}\)
4. Zero
A block is carried slowly up an inclined plane. If is work done by the friction, is work done by the reaction force, is work done by the gravitational force and is the work done by an external force, then choose the correct relation(s):
1.
2. = 0
3.
4. All of these