A bullet fired into a fixed target loses half of its velocity after penetrating 3 cm. How much further it will penetrate before coming to rest assuming that it faces constant resistance to motion?
3.0 cm
2.0 cm
1.5 cm
1.5 cm
D.
1.5 cm
Out of the following pair, which one does NOT have identical dimensions is
angular momentum and Planck’s constant
impulse and momentum
moment of inertia and moment of a force
moment of inertia and moment of a force
C.
moment of inertia and moment of a force
A body A of mass M while falling vertically downwards under gravity breaks into two parts; a body B of mass 1/3 M and a body C of mass 2/3 M. The centre of mass of bodies B and C taken together shifts compared to that of body A towards
depends on height of breaking
does not shift
body C
body C
B.
does not shift
No horizontal external force is acting
∴ = acm =0
since vcm= 0
∴∆xcm = 0
A particle of mass 0.3 kg is subjected to a force F=−kx with k=15 N/m. What will be its initial acceleration if it is released from a point 20 cm away from the origin?
3 m/s2
15 m/s2
5 m/s2
5 m/s2
D.
5 m/s2
a = kx/m =10m /s2