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14. Two blocks A and 8 of weights 500 71 and 1000 N are placed on an inclined plane
(Fig.8). The blocks are connected by a string to the parallel plane. The coefficient of
friction between the inclined plane and the block A is 0.15 and that for the block B is 0.4.
Find the inclination of the plane when the motion is about to take place. Also calculate

the tension in the string.

Fig.8

SET 3
Answer any 2 questions. Each question carries 10 Marks (2 X 10 = 20 Marks)

15. An elevator weighing 5000 N is ascending with an acceleration of 3 m/s’. During this
ascent its operator whose weight is 700 N is standing on the scales placed on the floor.
What is the scale reading? What will be the total tension in the cables of the elevator
during this motion?

16. A weight of SON suspended from a spring vibrates vertically with amplitude of 8cm and a
frequency of | oscillation per second. Find (a) the stiffness of the spring. (b) The maximum
tension induced in the spring and (c) the maximum velocity of the weight

17. A weight of 100N suspended from a spring vibrates vertically with amplitude of 8cm and a
frequency of oscillation per second. Find

(a) The stiffness of the spring

(b) The maximum tension induced in the spring

(c) The maximum velocity of the weight