Advertisements
Advertisements
Question
Give an example
Electrical energy changes of sound energy.
Solution
Electric bell
APPEARS IN
RELATED QUESTIONS
A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
Define work.
A coolie is moving on a road with a luggage on his head. Does he perform work against the force of gravity? Give reason for your answer.
How is work related to energy?
A boy of mass 40 kg climbs up the stairs and reaches the roof at a height 8 m in 5 s. Calculate:
- the force of gravity acting on the boy,
- the work done by him against the force of gravity,
- the power spent by boy. (Take g = 10 m s-2)
Name the forms of energy which a wound-up watch spring possesses.
A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:
The loss in potential energy of the body,
What is the ratio of SI units to CGS units of 'work'?
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
A body does 20 J of work in 10 s. What is its power?
Define force. Is force a scalar or a vector quantity?
State the amount of work done by an object when it moves in a circular path for one complete rotation. Give a reason to justify your answer.
What do you understand by the term energy? Is energy a scalar or vector? How is the energy possessed by a body measured?
Explain, why submarines are able to dive underwater as well as a sail on the surface of the water?