When a freely falling body eventually stops on reaching the ground, its kinetic energy gets converted into heat energy (as the body and ground warm up due to the collision),…
The power of four devices = 4 × 500 W = 2000 W Time = 10 hours Therefore, the energy consumed = power × time = 2,000 × 10 Wh…
If the resultant force acting on a body in different directions is zero, then the acceleration will be zero. We know that, F = ma, In the net force is…
In the first case, the force and displacement are perpendicular to each other, so work done is zero. In the second case, the force and displacement are in the same…
Mass of the car (m) = 1500 kg Velocity of the car (v) = 60 km/h =m/s The car is in motion, so its energy = kinetic energy = 𝑚𝑣2…
The object is in motion, so its energy = kinetic energy = mv2 The kinetic energy of the object, when it comes to rest = 0. Work done on object …
In the given pendulum, there are three cases of points to be discussed. At the points B and C, the pendulum bob is at its maximum height, so its potential…
Power (P) = 1500 W Time (t) = 10 hours = (10 × 60 × 60) seconds = 36,000 seconds We know that, Energy (E) = Power × time =…
The person holding a bundle of hay get tired because his muscular energy is converting into thermal energy. There is no displacement at all, so he had no work. As…
Yes, it is true. There may be displacement in the absence of force. We know that, F = ma, In the absence of force, F = 0, then ma =…