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प्रश्न
Calculate the change in the Kinetic energy of a moving body if its velocity is reduced to 1/3rd of the initial velocity.
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उत्तर
K.E.1 = `1/2 "mv"^2`
K.E.2 = `1/2"m"(1/3"v")^2`
KE1 : KE2
`1/2 "mv"^2= 1/2"m"(1"v"^2)/9`
`"mv"^2/2="mv"^2/18=18:2=9:1`
संबंधित प्रश्न
Fill in the blank
An object falling freely from the roof of a multistorey building has ________ and _________ energy when halfway down the building.
Define the term kinetic energy. Give one example of a body which possesses kinetic energy.
Name the type of energy (kinetic energy K or potential energy U) possessed in the given cases:
A moving bus
State the energy changes in the following case while in use:
an electric toaster.
State the energy changes in the following case while in use:
a ceiling fan
Name three non-renewable sources of energy.
State the energy transformation on the following:
Electricity is obtained from wind energy.
MULTIPLE CHOICE TYPE:
The ultimate source of energy is:
(a) wood
(b) wind
(c) water
(d) sun
Give three examples of bodies possessing potential energy.
Name a device in which solar energy is converted into electricity state its two uses.
