Advertisements
Advertisements
Question
Advertisements
Solution
APPEARS IN
RELATED QUESTIONS
A boy weighing 40 kgf climbs up a stair of 30 steps each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes. Compare:
- The work done by them.
- The power developed by them.
A satellite revolves around the earth in a circular orbit. What is the work done by the force of gravity? Give reason.
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?
In the following case write yes, if the work is being done and no if no work is being done.
A man moving on the rough ground.
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.
State two conditions for work to be done.
What happens to the power if the time for doing work is reduced from t second to t/10 second?
Relate 1 KWh (kilowatt hour) with joule.
