Advertisements
Advertisements
प्रश्न
Calculate the change in the Kinetic energy of a moving body if its velocity is reduced to 1/3rd of the initial velocity.
Advertisements
उत्तर
Let the inital kinetic energy be E1=E
Now, the kinetic energy is directly proportional to the square of the velocity
K.E ∝ v2
∴ Final kinetic energy =E2=`1/9E`
Hence, the change in kinetic energy is given as,
`ΔE=E_1-E_2`
`Delta E=E-1/9E`
`Delta E=8/9E`
APPEARS IN
संबंधित प्रश्न
What name is given to the heat energy obtained from hot rocks inside the earth?
A bucket full of water .is on the first floor of your house and another identical bucket with same quantity of water is kept on the second floor. Which of the two has greater potential energy ?
A light mass and a heavy mass have equal momentum. Which will have more kinetic energy?
(Hint : Kinetic energy K = P2/2m where P is the momentum.)
Differentiate between the potential energy (U) and the kinetic energy (K).
State the energy changes in the following case while in use:
an electric cell in a circuit
Select the renewable and non-renewable sources of energy from the following:
Wind
Give one disadvantage of using a solar cell.
A ball of mass 0.5 kg slows down from a speed of 5m/s-1 to that of 3m/s-1. Calculate the change in kinetic energy of the ball.
Give one example when:
Mechanical energy changes to electric energy.
When and why do clothes smell of naphthalene?
