Advertisements
Advertisements
Question
State the C.G.S. unit of work. How it is related to its S.I. unit?
Solution
The C.G.S. unit of work is erg. 1 erg = 1 dyne × 1 cm.
The S.I. unit of work is the joule. 1 joule = 1 Newton × 1 metre
Relationship: 1 J = 1 N × 1 m
= 105 dyne × 100 cm = 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?
A body is moved in a direction opposite to the direction of force acting on it. State whether the work is done by the force or work is done against the force
A man spends 7.4 KJ energy in displacing a body by 74 m in the direction in which he applies force in 2.5 s. Calculate the force applied.
Name the force needed for circular motion. What is the direction of the force?
What is the S.I. unit of work? Define it.
State the practical unit mainly used in mechanical engineering and write down its equivalent in watt.
For the following scenarios, state whether the work done by gravity is positive, negative, or zero.
A person walks on a levelled road.
A man raises a box of mass 50 kg to a height of 2 m in 20 s, while another man raises the same box to the same height in 50 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1