applied-mechanics civil-engineering question and answers -Page 20

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Applied Mechanics problems

2. A block of weight 50 kg is placed on a horizontal plane. When a horizontal force of 18 kg is applied, the block is just on the point of motion. The angle of friction is
Options
A. 17� 48'
B. 18� 48'
C. 19� 48'
D. 20� 48'
E. 21� 48'.

3. From a circular plate of a diameter 6 cm is cut out a circle whose diameter is equal to the radius of the plate. The C.G. of the remainder from the centre of circular plate is at a distance of
Options
A. 2.0 cm
B. 1.5 cm
C. 1.0
D. 0.5 cm.

4. To double the period of oscillation of a simple pendulum
Options
A. the mass of its bob should be doubled
B. the mass of its bob should be quadrupled
C. its lenght should be quadrupled
D. its length should be doubled.

5. A particle executes a simple harmonic motion. While passing through the mean position, the particle possesses
Options
A. maximum kinetic energy and minimum potential energy
B. maximum kinetic energy and maximum potential energy
C. minimum kinetic energy and maximum potential energy
D. minimum kinetic, energy and minimum potential energy
E. none of these.

7. The acceleration of a particle moving along the circumference of a circle with a uniform speed, is directed
Options
A. radially
B. tangentially at that point
C. away from the centre
D. towards the centre.

9. A train weighing 196 tonnes experiences a frictional resistance of per tonne. The speed of the train at the top of a down gradient 1 in 78.4 is 36 km/hour. The speed of the train after running 1 km down the slope, is
Options
A. 510 m/sec
B. 105 m/sec
C. 53 m/sec
D. 35 m/sec.

10. If a particle moves with a uniform angular velocity ? radians/sec along the circumference of a circle of radius r, the equation for the velocity of the particle, is
Options
A. v = ?
B. y = ? y - r
C. v = ?
D. v = ?

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