Engineering Mechanics

Chapter 6 : Centre of Gravity „„„„„ 99

3. How many centres of gravity a body has?


4. Describe the various methods of finding out the centre of gravity of a body.


5. How would you find out the centre of gravity of a section, with a cut out hole?

OBJECTIVE TYPE QUESTIONS

1. The centre of gravity of an equilateral triangle with each side (a) is ...... from any of the
   three sides.

(a)

3

2

a

(b)

2

3

a

(c)

23

a

(d)

32

a

2. The centre of gravity of hemisphere lies at a distance of ......form its base measured along
   the vertical radius.

(a)

3

8

r

(b)

3

8 r (c)

8

3

r

(d)

8

3 r

3. The centre of gravity of a right circular cone of diameter (d) and height (h) lies at a
   distance of ...... from the base measured along the vertical radius.

(a)

2

h

(b)

3

h

(c)

4

h

(d)

6

h

4. A circular hole of radius (r) is cut out from a circular disc of radius (2r) in such a way that the
   diagonal of the hole is the radius of the disc. The centre of gravity of the section lies at
   (a) Centre of a disc (b) Centre of the hole
   (c) Somewhere in the disc (d) Somewhere in the hole

ANSWERS

1. (c) 2. (a) 3. (c) 4. (c)

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