Default Title

Question (1)

QN0035295

The centre of mass of a body

(A)
lies always outside the body
(B)
may lie within, outside on the surface of the body
(C)
lies always inside the body
(D)
lies always on the surface of the body

Correct Answer: B

Explanation:

Centre of mass depends on the distribution of mass in the body.

Link:

Report Error

Question (2)

QN0035296

Two bodies of mass and have position vectors and respectively. The magnitude of position vector of centre of mass of this system will be similar to the magnitude of vector:

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

Position of COM of a mass - system is given as,

Only option (a) magnitude is

So option (a) is correct.

Link:

Report Error

Question (3)

QN0035300

The centre of mass of two particles lies on the line

(A)
joining the particles
(B)
perpendicular to the line joining the particles
(C)
at any angle to this line
(D)
None of these

Correct Answer: A

Explanation:

Link:

Report Error

Question (4)

QN0035301

Three identical spheres, each of mass 1 are kept as shown in figure, touching each other, with their centres on a straight line. If their centres are marked respectively, the distance of centre of mass of the system from is

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

and

Link:

Report Error

Question (5)

QN0035302

The coordinates of centre of mass of a uniform flag shaped lamina (thin flat plale) of mass . (The coordinates of the same are shown in figure) are:

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

For given Lamina

Coordinate of centre of mass of flag shaped lamina

Link:

Report Error

Question (6)

QN0035303

Two spheres and of masses and and radii and respectively are placed in contact as shown. The COM of the system lies

(A)
inside
(B)
inside
(C)
at the point of contact
(D)
None of these

Correct Answer: C

Explanation:

Link:

Report Error

Question (7)

QN0035304

Centre of mass of the earth and the moon system lies

(A)
closer to the earth
(B)
closer to the moon
(C)
at the mid-point of line joining the earth and the moon
(D)
cannot be predicted

Correct Answer: A

Explanation:

Link:

Report Error

Question (8)

QN0035307

Consider a system of two particles having masses and . If the particle of mass is pushed towards the centre of mass particles through a distance , by what distance would the particle of mass move so as to keep the mass centre of particles at the original position?

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

Link:

Report Error

Question (9)

QN0035308

Three masses are placed on the -axis : at origin, 500 at and at . The distance of the centre of mass from the origin is

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

Link:

Report Error

Question (10)

QN0035309

A system consists of three particles, each of mass and located at and . The co-ordinates of the centre of mass are

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

The coordinates of C.M of three particle are

here

so so coordinates of C.M. of three particle are

Link:

Report Error

Question (1)

The centre of mass of a body

Explanation:

Link:

Question (2)

Two bodies of mass and have position vectors and respectively. The magnitude of position vector of centre of mass of this system will be similar to the magnitude of vector:

Explanation:

Link:

Question (3)

The centre of mass of two particles lies on the line

Explanation:

Link:

Question (4)

Three identical spheres, each of mass 1 are kept as shown in figure, touching each other, with their centres on a straight line. If their centres are marked respectively, the distance of centre of mass of the system from is

Explanation:

Link:

Question (5)

The coordinates of centre of mass of a uniform flag shaped lamina (thin flat plale) of mass . (The coordinates of the same are shown in figure) are:

Explanation:

Link:

Question (6)

Two spheres and of masses and and radii and respectively are placed in contact as shown. The COM of the system lies

Explanation:

Link:

Question (7)

Centre of mass of the earth and the moon system lies

Explanation:

Link:

Question (8)

Consider a system of two particles having masses and . If the particle of mass is pushed towards the centre of mass particles through a distance , by what distance would the particle of mass move so as to keep the mass centre of particles at the original position?

Explanation:

Link:

Question (9)

Three masses are placed on the -axis : at origin, 500 at and at . The distance of the centre of mass from the origin is

Explanation:

Link:

Question (10)

A system consists of three particles, each of mass and located at and . The co-ordinates of the centre of mass are

Explanation:

Link:

Excel With Tutors

ExcelWithTutors

For Student

For Tutors

Learn

OUR POLICY