Advertisements
Advertisements
प्रश्न
Can any object have mechanical energy even if its momentum is zero? Explain.
Advertisements
उत्तर
Yes, if momentum of an object is zero, i.e.; p = mv = 0
which gives v = 0 as m ≠ 0
Kinetic energy of the object = `1/2"mv"^2` = 0
Now, Mechanical energy = potential energy + kinetic
energy (= 0) – potential energy (∴ K. E = 0)
So any object can have mechanical energy even if its momentum is zero.
APPEARS IN
संबंधित प्रश्न
State the energy changes in the following while in use A loudspeaker .
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in a loaded truck when started and set in motion.
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in the Charging of a battery.
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in respiration.
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in the burning of a match stick.
State the energy changes in the following case while in use:
loudspeaker
State the energy changes in the following case while in use:
a steam engine
State the energy changes in the following case while in use:
Washing machine
State the energy changes in the following case while in use:
A solar cell
Define watt. Express kilowatt in terms of joule per second. A 150 kg car engine develops 500 W for each kg. What force does it exert in moving the car at a speed of 20 ms–1?
