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7. System of Particles and Rotational Motion
Home · Class 11 · Physics · Ref. Book · 7. System of Particles and Rotational Motion
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Q8 of 8 Page 178

A non-uniform thin rod of length l lies along the x axis with one end at the origin. It has linear mass density λ kgm-1 given by. Find the centre of mass of the rod.

Given linear mass density =

Length of rod = l






Where is the small element at a distance x from origin.


Since the plate is symmetric about y axis so the centre of mass lies at x axis








Hence centre of mass lies at a distance from the origin.


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4

A man of mass m stands at one end of a plank of length l which lies at rest on a frictionless horizontal surface. The man walks to the other end of the plank. If the mass of the plank is m/3 the distance that the man moves relative to the ground will be _________

(a)


(b)


(c)


(d)

5

A circular plate of uniform thickness has a diameter of 56 cm. A circular portion of diameter 42cm is removed from one edge of the plate. Find the position of the centre of mass of the remaining portion.

6

The speed of a motor increases from 1200rpm to 1800rpm in 20s. How many revolutions does it make in this period of time?

7

A thin sheet of metal of uniform thickness is cut into the shape bounded by the line

x = a,


y = kx2


y = –kx2


Find coordinates of centre of mass.

Questions · 8
7. System of Particles and Rotational Motion
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