Advertisements
Advertisements
प्रश्न
A bullet is of mass 'm' g and is moving with a velocity 'v' m/s. Find the kinetic energy of the bullet when
(a) The mass is doubled,
(b) The velocity is tripled.
Advertisements
उत्तर
K.E of the bullet = `1/2` mv2
(a) If the mass is doubled,
K.E' = `1/2`(2m) v2 = `2 xx 1/2`mv2 = 2K.E
`"K.E"/"K.E" = 2/1`
(b) If the velocity is tripled,
K.E = `1/2` m(3v)2 = 9 x `1/2` mv2
`"K.E"/"K.E" = 9/1`
APPEARS IN
संबंधित प्रश्न
Derive a relationship between S.I. and C.C.S. unit of work
Give two examples of work done.
Complete the following sentences:
1 H.P. = ........ W.
State the amount of work done by an object when it moves in a circular path for one complete rotation. Give a reason to justify your answer.
State larger units of power.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Food grains are getting dried in the sun.
