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Question
Name the type of energy (kinetic energy K or potential energy U) possessed in the following case:
A moving cricket ball
Options
Kinetic energy
Potential energy
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Solution
Kinetic energy
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MULTIPLE CHOICE TYPE:
The ultimate source of energy is:
(a) wood
(b) wind
(c) water
(d) sun
Calculate the decrease in the kinetic energy of a moving body if its velocity reduces to half of the initial velocity.
State the energy changes which take place in Electricity is obtained from solar energy.
State two advantages and two disadvantages of using hydro-energy for producing electricity.
A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?
In a hydroelectric power station, 1000 kg of water is allowed to drop through a height of 100 m in 1 sec. If the conversion of potential energy to electric energy is 60%. Calculate the power output. [Take: g = 10m/sec2]
