Advertisements
Advertisements
Question
Name the quality which is measured in Wh.
Solution
Energy is measured in Wh
APPEARS IN
RELATED QUESTIONS
If the power of a motor is 100 kW, at what speed can it raise a load of 50,000 N?
A satellite revolves around the earth in a circular orbit. What is the work done by the force of gravity? Give reason.
What are the S.I. and C.G.S units of work? How are they related? Establish the relationship.
What physical quantity does the electron volt (eV) measure? How is it related to the S.I. unit of that quality?
State the condition when a force produces
(i) linear motion.
(ii) rotational motion, in a body.
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?
What do you mean by a centrifugal force?
A pump is used to lift 600 kg of water from a depth of 75 m in 10s. Calculate:
- The work done by the pump,
- the power at which the pump works, and
- The power rating of the pump if its efficiency is 40%. (Take g = 10m s-2).
`["Hint" : "Efficiency" = "useful power"/"power input"]`
A force F when acts on a body, displace it by a distance d in a direction at an angle θ with the direction of the force. Write down the expression for the work done by the force.
