Advertisements
Advertisements
Question
State the S.I. and C.G.S. units of energy. How are they related?
Solution
The S.I. unit of energy is the joule (J) and the C.G.S. unit is erg.
1J = 107 erg.
APPEARS IN
RELATED QUESTIONS
A man having a box on his head, climbs up a slope and another man having an identical box walks the same distance on a levelled road.
Who does more work against the force of gravity and why?
When a body moves in a circular path, how much work is done by the body? Give reason.
(Hint: The body is acted upon by the centripetal force.)
Give an example when work done by the force of gravity acting on a body is zero even though the body gets displaced from its initial position.
Name the quality which is measured in kW.
A body is provided at a point. A force of 20 N is applied at a distance of 40 cm from the pivot. Find the moment of force about the pivot.
A mechanic can open a nut by applying a force of 200 N while using a lever handle of 50 cm length. How long handle is required if he wants to open it by applying a force of only 50 N?
Work is a scalar quantity because it is a measure of transfer of energy without indicating any direction
1 kWh = ______ J.
State the practical unit mainly used in mechanical engineering and write down its equivalent in watt.
The world record for weight lifting was held by Sergei Didyk of the USSR. He lifted 261 kg to a height of 2.3 m in 4s; find:
(a) Weight lifted by him
(b) Work done by him
(c) Power developed by him. (g = 10m/s2)
