A body having an initial kinetic energy 2 J collides with an identical body at rest. The maximum loss of kinetic energy in the collision will be:
1. | 2 J | 2. | Zero |
3. | 1 J | 4. | 1.5 J |
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.
The energy required to accelerate a car from rest to 30 m/s is E. The energy required to accelerate the car from 30 m/s to 60 m/s will be:
1. | E | 2. | 2E |
3. | 3E | 4. | 4E |
The speed of a particle moving in a circular path decreases with time. The instantaneous power due to the force acting on it will be:
1. Positive
2. Negative
3. Zero
4. Maybe positive or negative
1. | \(0\%\) | 2. | \(25\%\) |
3. | \(50\%\) | 4. | \(100\%\) |
A body is obliquely projected from the horizontal ground. The magnitude of gravity's power delivered during its motion from the ground to the topmost point is:
1. | Constant
|
2. | Increases continuously
|
3. | Decreases continuously
|
4. | May increase or decrease depending on the angle of projection |
1. \(50~\text{J}\)
2. \(100~\text{J}\)
3. \(25~\text{J}\)
4. Zero
A particle is suspended by a light rod of length l. The minimum speed at which the particle should be projected, so that it moves in a vertical circle, is:
1. | \(3 \sqrt{g l} \) | 2. | \(\sqrt{2 g l} \) |
3. | \(2 \sqrt{g l} \) | 4. | \(\sqrt{5 g l}\) |
According to the work-energy theorem, the change in kinetic energy of a body is equal to work done by:
1. Non-conservative force on the particle
2. Conservative force on the particle
3. External force on the particle
4. All the forces on the particle