Advertisements
Advertisements
Question
Advertisements
Solution
Examples of potential energy:
(i) Water stored at a height in a reservoir.
(ii) A stretched spring.
APPEARS IN
RELATED QUESTIONS
Why is a jack screw provided with a long arm?
An electron emitter must have _____________ work function and ___________ melting point.
A car is running at a speed of 15 km h-1 while another similar car is moving at a speed of 45 km h-1. Find the ratio of their kinetic energies.
How much work is done when a body of mass m is raised to a height h above the ground?
Explain by an example that a body may possess energy even when it is not in motion.
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
A truck driver can load oil drums into the back of the truck by pushing them up a sloping plank, or by lifting them directly. Each drum has a mass of 80 kg, the plank is 3 m long, and the back of the truck is 0.8 m above the ground.

(i) How much force would be needed to lift a drum into the truck directly/without using the plank? (Take g = 10 m/s2)
(ii) How much energy would be required in lifting the drum into the truck without the plank?
(iii) If the force needed to push the drum up the plank is 300 N, why is this less than the answer to part (i)?
(iv) When the truck is loaded, the driver drives off. List the major energy changes that take place in moving the truck.
(v) The driver has to stop at the factory gates. What happens to the kinetic energy of the truck?
One labourer carried four pans of road metal through a distance of 100 metres. If he carries two pans of road metal through a 200 metre distance ______ work will be done.
A force of F = (5y + 20) `hat"j"` N acts on a particle. The work done by this force when the particle is moved from y = 0 m to y = 10 m is ______ J.
