EXPLOSION OF A PARTICLE
A body falling vertically downwards under the
gravity breaks in two parts of unequal masses. The
centre of mass of the two parts taken together shifts
horizontally towards
(a) Heavier piece
(b) Lighter piece
(c) Does not shift horizontally
(d) Depends on the vertical velocity at the time of
breaking
When an explosive shell travelling in a parabolic
path under the effect of gravity explodes in the mid
air, the centre of mass of the fragments will move
(a) Along the original parabolic path
(b) Vertically downwards
(c) Horizontal followed by parabolic path
(d) Vertically upwards and then vertically
downwards
A body just dropped from a tower explodes into
two pieces of equal mass in mid-air. Which of the
following is not possible?
(a) One part reaches the ground earlier then the
other
(b) Each part will follow parabolic path
(c) Only one part will follow parabolic path
(d) Both parts move along a vertical line
If a shell fired from a cannon, explodes in mid air,
then
(a) Its total momentum increases
(b) Its total kinetaic energy increases
(c) Its total kinetaic energy decreases
(d) None of these
A block moving in air explodes into two parts then
just after explosion (neglect change in momentum
due to gravity)
(a) The total momentum of two parts must be same
to the momentum of the block before explosion.
(b) The total momentum must change.
(c) The total kinetic energy of two parts must be
same to the momentum of the block before
explosion.
(d) The total kinetic energy must be constant.
A bomb of mass 9kg explodes into 2 pieces of mass
3 kg and 6kg. The velocity of mass 3kg is
the K.E of mass 6kg is
(a) 9.6 J (b) 3.84 J (c) 2.92 J (d) 1.92J
A shell is fired from a cannon with velocity v m/sec
at an angle
A stationary particle explodes into two particles of
a masses
1.6 / ,m s
with the horizontal direction. At the
highest point in its path it explodes into two pieces
of equal mass. One of the pieces retrace its path to
the cannon and the speed in m/sec of the other
piece immediately after the expolsion is
(a)2 cosv (b) 3 cosv
(c)
3
cos
2
v (d)
3
cos
2
v
m 1 and m 2 which move in opposite
directions with velocities v 1 and v 2. The ratio of
their kinetic energies E E1 2 is
(a) m m 1 / 2 (b) 1
(c) mv m v1 2/ 2 1 (d) 2 1
A stationary body explodes into two fragments of
masses
6.
7.
8.
9.
m m/
m andm 1 2. If momentum of one fragment
is p, the minimum energy of explosion is
