MEDIUM
Earn 100

What is potential energy? Derive an equation for gravitational potential energy of a body of mass 'm' at a height 'h'.

Important Questions on Work and Energy

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Science>Physics>Work and Energy>Energy
List any three differences between nuclear fission reaction and nuclear fusion reaction.
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Science>Physics>Work and Energy>Energy
Explain how is nuclear energy generated in power reactors. How is electricity produced from nuclear energy?
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Science>Physics>Work and Energy>Energy
Write any four differences between nuclear fusion and nuclear fission.
EASY
Science>Physics>Work and Energy>Energy
An object of mass 15kg is moving with uniform velocity of 4m/s. What is the kinetic energy possessed by the object?
HARD
Science>Physics>Work and Energy>Energy
A block of 9 kg is moving with a velocity of 4 m/s on a frictionless surface. The block comes to rest by compressing the spring. If the spring constant is 4x104 N/kg, then find the compression in the spring.
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Science>Physics>Work and Energy>Energy
Write a short note on: Nuclear Energy
EASY
Science>Physics>Work and Energy>Energy
Uranium is used to obtain:
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Science>Physics>Work and Energy>Energy
Which of the following graphs shows correct relation of kinetic energy (E), potential Energy (U) and height (h) from the ground of a particle?
EASY
Science>Physics>Work and Energy>Energy
A rod of length l and mass m fixed at one end, is hanging vertically. The other end is now raised so that the rod makes an angle 30° with horizontal line. The work done in the process will be :
EASY
Science>Physics>Work and Energy>Energy
Flying birds has
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Science>Physics>Work and Energy>Energy
Which one of the following is an example of Biomass energy source.
HARD
Science>Physics>Work and Energy>Energy

A spring of spring constant K= 4x103N/m is compressed by 2 cm, then determine the potential energy stored in spring. 

EASY
Science>Physics>Work and Energy>Energy
Which of the following graphs best represent the graphical relationship between Kinetic Energy (K.E) and momentum (P) of a body in motion?
EASY
Science>Physics>Work and Energy>Energy
Write the name of two elements used as nuclear energy.
EASY
Science>Physics>Work and Energy>Energy
How fast should a man weighing 600 N run to achieve a kinetic energy of 750 J. Take g=10 m s-2.
EASY
Science>Physics>Work and Energy>Energy
In any physical or chemical process, the total energy:
EASY
Science>Physics>Work and Energy>Energy
Define a kilowatt-hour. How is it related to joule?
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Science>Physics>Work and Energy>Energy

Ratio of potential energies of body A and body B will be

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EASY
Science>Physics>Work and Energy>Energy
Write in your words the definition of potential energy.
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Science>Physics>Work and Energy>Energy
Two bodies A and B have masses in the ratio 5:1 and their kinetic energies are in the ratio 125:9. Find the ratio of their velocities.