# Civil Engineering - Applied Mechanics

### Exercise :: Applied Mechanics - Section 3

6.

A body A of mass 6.6 kg which is lying on a horizontal platform 4.5 m from its edge is connected to the end of a light string whose other end is supporting a body of mass 3.2 kg as shown in below figure. If the friction between the platform and the body A is 1/3, the acceleration is A. 0.5 m/sec2 B. 0.75 m/sec2 C. 1.00 m/sec2 D. 1.25 m/sec2.

Explanation:

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7.

The motion of a particle is described by the relation x = t2- 10t + 30, where x is in metres and t in seconds. The total distance travelled by the particle from t = 0 to t = 10 seconds would be

 A. zero B. 30 m C. 50 m D. 60 m E. none of these.

Explanation:

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8.

Three forces which act on a rigid body to keep it in equilibrium. The forces must be coplanar and

 A. concurrent B. parallel C. concurrent parallel D. none of these.

Explanation:

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9.

A square hole is made in a circular lamina, the diagonal of the square is equal to the radius of the circleas shown in below figure the shift in the centre of gravity is A. B. C. D. Explanation:

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10.

For perfectly elastic bodies, the value of coefficient of restitution is

 A. zero B. 0.5 C. 1.0 D. between 0 and 1.