Advertisements
Advertisements
Question
What are the uses of mechanical energy?
Advertisements
Solution
- In hydroelectric plants, the kinetic energy of water is converted into electrical energy.
- Windmills convert the kinetic energy of winds into electrical energy.
- The mechanical energy of the hammer is used to apply a force to a nail.
- Mechanical energy can bring a moving body to rest and make a body at rest move.
APPEARS IN
RELATED QUESTIONS
The energy of a flying kite is kinetic energy.
Kinetic energy = 1/2 × mass × ............
State two factors on which the kinetic energy of a moving body depends.
A car is moving with a speed of 15 km h-1 and another identical car is moving with a speed of 30 km h-1. Compare their kinetic energy.
A cannon ball of mass 500 g is fired with a speed of 15 m s-1. Find:
- its kinetic energy.
- its momentum.
Two bodies have masses in the ratio 5 : 1 and their kinetic energies are in the ratio 125 : 9. Calculate the ratio of their velocities.
Two objects having equal masses are moving with uniform velocities of 2 m/s and 6 m/s respectively. Calculate the ratio of their kinetic energies.
On a level road, a scooterist applies brakes to slow down from a speed of 10 m/s to 5 m/s. If the mass of the scooterist and the scooter be 150 kg, calculate the work done by the brakes. (Neglect air resistance and friction)
Derive the formula for the kinetic energy of an object of mass m, moving with velocity v.
Find out the form of energy possessed by the following thing.
Water falls
