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
A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
Why is the work done on an object moving with uniform circular motion zero?
When you move upstairs, do you perform some work?
Can every force produce work?
State the energy changes which take place when A piece of magnesium wire is burnt in a jar of oxygen.
What should be the characteristic of a source of energy?
A force can cause an object to change its ______.
A proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is ______.
