Welcome to your Rotational Motion -5
1.
A bullet fired from gun causes gun to recoil. COM of gun–bullet system
2.
An L-shaped lamina made of three identical squares has total mass 3 kg. Mass of each square is
3.
If no external force acts, COM
4.
For system of particles, MR equals
5.
In previous lamina, COM y-coordinate equals
6.
Motion of COM of rigid body depends on
7.
Total momentum of system equals
8.
If masses are constant, differentiation of COM gives
9.
A system of particles is moving with constant velocity. Net external force is
10.
In explosion of a body at rest, COM after explosion
11.
A system of particles behaves like a single particle of mass M located at
12.
If mass of each square is equal, COM depends on
13.
A system with many internal forces but no external force will have COM
14.
COM of L-shaped lamina lies
15.
Treating a rigid body as a particle at COM is valid for
16.
If all external forces act at COM, system will undergo
17.
Centre of mass of each strip in a triangular lamina lies at
18.
Differentiation of MR = Σmr with respect to time gives
19.
If coordinates of square centres are (½,½), (3/2,½), (½,3/2), COM x-coordinate is
20.
Internal forces in system are always
21.
Explosion of a body affects COM motion how?
22.
Even if particles move randomly, COM motion depends on
23.
An L-shaped lamina is divided into three equal squares. COM is found by
24.
Projectile explodes mid-air. COM motion after explosion is
25.
Three masses 100 g, 150 g, 200 g are placed at (0,0), (0.5,0) and (0.25, 0.25√3). COM lies
26.
Vector equation for COM is written as
27.
Differentiating momentum equation gives
28.
Total momentum of system equals
29.
COM of a triangular lamina is found by dividing it into
30.
Acceleration of COM depends on
31.
Equation MA = Fₑₓₜ represents
33.
In the above triangle, why is COM not at centroid?
34.
If mass of triangular lamina is doubled uniformly, its COM
35.
COM of a body moving under gravity alone follows
36.
COM of a uniform triangular lamina lies on
37.
Before explosion, a shell is moving horizontally. After explosion, COM will move
38.
A triangular lamina is divided into many thin strips parallel to base. COM of lamina lies at
39.
If Fₑₓₜ = 0, acceleration of COM is
40.
Velocity of centre of mass is defined as
41.
COM of each square in L-shaped lamina is assumed at
42.
A man jumps forward inside a boat floating on still water. COM of man–boat system
43.
A shell explodes into two fragments of unequal masses. The lighter fragment moves faster because
44.
Treating a body as particle at COM is valid when studying
45.
Acceleration of centre of mass depends on
