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प्रश्न
A moving body weighing 400 N possesses 500 J of kinetic energy. Calculate the velocity with which the body is moving. (g = 10 ms2)
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उत्तर
Given : Weight = 400 N,
W = mg
400 = m × 10
m = 40 kg
Now, Kinetic Energy =`1/2"mv"^2`
`500 =1/2xx40xx"v"^2`
v = 5 m/s
संबंधित प्रश्न
Fill in the blank
An object falling freely from the roof of a multistorey building has ________ and _________ energy when halfway down the building.
Name the type of energy (kinetic or potential) possessed by the following:
A compressed spring.
Select the renewable and non-renewable sources of energy from the following:
Water
What is wind energy?
What is nuclear energy?
Explain the principle of producing electricity using the nuclear energy.
Identify the type of energy possessed by the body in each of the following:
(a) A coiled spring of the toy car
(b) A hammer which is raised
(c) A stone shot from a catapult
(d) Water stored in the overhead tank
(e) A tadpole moving in water.
A metal ball of mass 2kg is allowed to fall freely from rest from a height of 5m above the ground.
What the kinetic energy of the ball just before it hits the ground ?
State the energy changes which take place when:
Electricity obtained from nuclear energy.
Give one example when:
Mechanical energy to heat energy.
