Advertisements
Advertisements
प्रश्न
For the same kinetic energy of a body, what should be the change in its velocity if its mass is increased nine times?
Advertisements
उत्तर
Let initial mass m1 = m, initial velocity v1 = v
Final mass m2 = 4m, Find velocity = v2
For the same kinetic energy,
`1/2`m1v12 = `1/2` m2v22 or `1/2` mv2 =`1/2` × 9m × v22
v2 =`sqrt(1/9"v"^2)=1/3"v".`
APPEARS IN
संबंधित प्रश्न
Fill in the blank
The energy possessed by a body due to its motion is called ______ energy.
Select the correct alternatives
The energy stored in an electric cell is
Name the type of energy (kinetic or potential) possessed by the following:
A bullet fired from a gun.
Give one relevant example for the following transformation of energy:
Electrical energy to mechanical energy.
Select the renewable and non-renewable sources of energy from the following:
Wind
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:
A magnesium ribbon burns in air.
Give one example when:
Chemical energy changes to light energy.
Obtain an expression for the kinetic energy of a body of mass m moving with a velocity v?
