Advertisements
Advertisements
प्रश्न
Obtain an expression for the kinetic energy of a body of mass m moving with a velocity v?
उत्तर
Let the body is brought to rest by a retarding force F after traveling a distance s.
From relation v2 = u2 + 2aS, retardation a =`"v"^2/(2"S")`
∴ Retarding force F = ma `="m"xx"v"^2/(2"S") =1/2("mv"^2) /"S"`
Work done W = F × S `=1/2("mv"^2)/"S"xx"S"=1/2"mv"^2`
Hence K.E = `1/2` mv2
APPEARS IN
संबंधित प्रश्न
What is geothermal energy?
State the energy change in the following device while in use:
A loudspeaker
Name the type of energy (kinetic or potential) possessed by the following:
A moving cricket ball.
A body of mass m falls down through a height h. Obtain an expression for the work done by the force of gravity.
Name the type of energy (kinetic energy K or potential energy U) possessed in the given cases:
A moving bus
State two advantages of producing electricity from solar energy.
Obtain an expression for the potential energy of a body of mass m at a height h above the ground.
State the energy changes which take place when:
A battery lighting up a bulb.
Give one example when:
Mechanical energy changes to electric energy.
Geothermal energy is:
