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प्रश्न
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
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उत्तर
Joule is the unit of work and energy.
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संबंधित प्रश्न
In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east, as shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.
State two factors on which the work done on a body depends.
A man lifts a mass of 20 kg to a height of 2.5 m. Assuming that the force of gravity on 1 kg mass is 10 N, find the work done by the man.
What are the units of (a) work, and (b) energy?
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
In case of negative work, the angle between the force and displacement is :
The work done on an object does not depend on the :
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.
Give an example
Chemical energy changes to heat energy.
(i) A 200g ball is thrown vertically upward with an initial velocity of 30 ms-1. Draw a velocity-time graph for the motion of ball.
(ii) How long will the ball take to reach the highest point?
(iii) What will be the kinetic energy of ball, when it returns to the starting point, neglecting the air resistance?
(iv) What will be the potential energy of ball at highest point?
