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
Explain how, geothermal energy is used to generate electricity.
Write true or false of the following statement.
There is always some loss of energy in conversion from one form of energy to another form, so the total energy is not conserved.
A boy of mass m climbs up a staircase of vertical height h.
(a) What is the work done by the boy against the force of gravity?
(b) What would have been the work done if he uses a lift in climbing the same vertical height?
State whether a solar cell produces a.c. or d.c.
What is wind energy?
Write the type of energy possessed in the following case:
A falling apple
Name the two groups in which various sources of energy are classified?
State two advantages and disadvantages of using wind energy for producing electricity.
Give one example when:
Potential energy changes to electric energy.
Nuclear fission is
