A circular plate of uniform thickness has a diameter of 28 cm. A circular portion of diameter 21 cm is removed from the plate as shown. 
is the centre of mass of complete plate. The position of centre of mass of remaining portion will shift towards left from 
by
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a)
5 cm
b)
9 cm
c)
4.5 cm
d)
5.5 cm
is the centre of mass of complete plate. The position of centre of mass of remaining portion will shift towards left from bya)
5 cm
b)
9 cm
c)
4.5 cm
d)
5.5 cm
Question ID - 100485 | SaraNextGen Top Answer A circular plate of uniform thickness has a diameter of 28 cm. A circular portion of diameter 21 cm is removed from the plate as shown. is the centre of mass of complete plate. The position of centre of mass of remaining portion will shift towards left from by
a)
5 cm
b)
9 cm
c)
4.5 cm
d)
5.5 cm
A circular plate of uniform thickness has a diameter of 28 cm. A circular portion of diameter 21 cm is removed from the plate as shown. is the centre of mass of complete plate. The position of centre of mass of remaining portion will shift towards left from by
|
a) |
5 cm |
b) |
9 cm |
c) |
4.5 cm |
d) |
5.5 cm |
(c)
is the centre of mass of cut portion and 
that of remaining portion.We have to find 
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Mass will be proportional to area. So mass of the whole disc is
Mass of cut portion 
Mass of the remaining portion 
Now,
