When a satellite moves around the Earth, the displacement in short interval is along the tangential direction and the force (gravitational force) is towards the centre of the Earth. Since,…
We know that, potential energy = mgh Where, m = 40 kg g = 9.8 m/s2 h = 5 m So, the potential energy = 40 × 9.8 × 5…
We know that 1 unit = 3,600,000 J So, 250 units = 250 × 3,600,000 J = 900,000,000 J = 9 × 108 J Hence, the energy consumed = 9…
Yes, energy transfer does take place even if the rock doesn't move. When you push the rock with all your might, your muscular energy is not wasted—it gets converted into…
The muscular energy of the cyclist is converted into kinetic (rotational) energy of wheels of cycle which is further converted into kinetic energy to run the bicycle.
No, this does not violate the law of conservation of energy. As the object falls, its potential energy decreases, but at the same time, its kinetic energy increases by the…
The work done by the gravitational force acting on the body is zero because the force acts vertically downward, while the displacement is horizontal. Since the force and displacement are…
Mass of the body (m) = 20 kg Initial velocity (u) = 5 m/s Final velocity (v) = 2 m/s We know that, Work done (W) = Change in kinetic…
When a battery lights a bulb, the energy changes involved are as follows: The chemical energy stored in the battery is first converted into Electrical energy, which flows through the…
When the object moves upwards, the work done by gravity is negative (as the direction of gravitational force is towards the Earth’s center) and when the object come downwards, there…