## Centre Of Mass-Basic

Compared to other sections, Physics is considered to be the most scoring section. If prepared thoroughly, Physics can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. Where will be the centre of mass on combining two masses m and M (M>m)

•  Towards m
•  Towards M
•  Between m and M
•  Anywhere

Towards M

Q2. 3. In the HCl molecule, the separation between the nuclei of the two atoms is about 1.27 Ã… (1 Ã… = 10–10 m). The approximate location of the centre of mass of the molecule from hydrogen is (assuming the chlorine atom to be about 35.5 times massive as hydrogen)

•  1 Ã…
•  2.5 Ã…
•  1.24 Ã…
•  1.5 Ã…

1.24

Q3.  A system consists of 3 particles each of mass and located at (1, 1) (2, 2) (3, 3). The co-ordinate of the centre of mass are

•  (6, 6)
•  (3, 3)
•  (2, 2)
•  (1, 1)

(2, 2)

Q4.  If a bomb is thrown at a certain angle with the horizontal and after exploding on the way the different fragments move in different directions then the centre of mass

•  Would move along the same parabolic path
•  Would move along a horizontal path
•  Would move along a vertical line
•  None of these

Would move along the same parabolic path

Q5. Four identical spheres each of mass m are placed at the corners of square of side 2metre. Taking the point of intersection of the diagonals as the origin, the co-ordinates of the centre of mass are

•  (0, 0)
•  (1, 1)
•  (– 1, 1)
•  (1, – 1)

(0, 0)

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