Advertisements
Advertisements
Question
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
Advertisements
Solution
Joule is the unit of work and energy.
APPEARS IN
RELATED QUESTIONS
Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?
Work done by a boy depends on the time in which he does work.
In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
Define the term energy.
How is work related to energy?
What are the two kinds of mechanical energy?
Give one example in which a force does zero work.
Why is the work done on an object moving with uniform circular motion zero?
Why does a spanner have a long handle?
When you move upstairs, do you perform some work?
Write an expression for work done by a force depends?
Can work done be zero even if force acts on the body?
Name the physical quantity whose MKS units are kgm2s-3.
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
An electric motor of power 100 W is used to drive the stirrer in a water bath. If 50% of the energy supplied to the motor is spent in stirring the water. Calculate the work done on the water in one minute.
A force can cause an object to change its ______.
A body of mass 0.5 kg travels on straight line path with velocity v = (3x2 + 4) m/s. The net work done by the force during its displacement from x = 0 tox = 2 m is ______.
