The rate of change of displacement of a body with respect to its surrounding, is

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Question
The rate of change of displacement of a body with respect to its surrounding, is known
Options
A. velocity
B. acceleration
C. speed
D. none of these.

Correct Answer

speed

Applied Mechanics problems

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1. A body of weight 14 g appears to weight 13 g when weighed by a spring balance in a moving lift. The acceleration of the lift at that moment was
Options
A. 0.5 m/sec²
B. 0.7 m/sec²
C. 1 m/sec²
D. 1 cm/sec².

2. 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 = ?

3. 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.

5. 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.

8. If a body is acted upon by a number of coplaner non-concurrent forces, it may
Options
A. rotate about itself without moving
B. move in any one direction
C. move in any one direction rotating about itself
D. be completely at rest
E. all the above.

10. The displacement of a particle which moves along a straight line is given by S = 4t³ + 3t² - 10 where S is in meters and t is in seconds. The time taken by the particle to acquire a velocity of 18 m/sec from rest, is
Options
A. sec
B. 1 sec
C. 1.5 sec
D. 1.5 sec.

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