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Engineering :: Applied Mechanics


291.  Centroid of the are of circle shown in adjacement figure is
A. r sin (?/2)/2 ?, 0 B. 2r sin (?)/?, 0
C. 2 r sin (?/2)/?, 0 D. r sin (?)/?, 0

292.  A sphere of radius r is cut from larger sphere of radius R. The distance between their centre is a. The centroid of the remaining valoume lies on the line of centres and the sistanc from the centre of the larger sphere is
A. aR/(R - r) B. aR/(R2-r2)
C. ar3 / (R3 - r3) D. ar2 / (R2 - r2)

293.  What is the total acceleration of a point on the rim of a flywheel 4 mts in diameter 0.6 see after it has started from rest if it accelarates uniformly from rest to 2000 rpm in 20 secs.
A. 33.2 mts/sec2 B. 78.94 mts/sec2
C. 68.9 mts/sec2 D. 102.6 mts/sec2

294.  A wheel 8 mts in diameter coasts to rest from a speed of 800 rpm in 10 minutes. Its angular deceleration is
A. 809 rad/min2 B. 308/min2
C. 502 rad/min2 D. 683 rad/min2

295.  In a slider crank mechanism, the crank is rotating at 200 rpm. If length of connecting rod is 8 mts and crank shaft is 2 mts, velocity of crosshead at 30? rotation of crank shaft equals.
A. 35.8 mts/s B. 33.2 m/s
C. 30.2 m/s D. 25.5 m/s

296.  In the above problem, acceleration of crooshead at 30? phase equals
A. 520 m/s2 B. 640 m/s2
C. 780 m/s2 D. 870 m/s2

297.  A body having SHM has period of 6 sec and amplitude of 4 mts. Maximum velocity is
A. 4?/3 m/s B. 2?/3 m/s
C. 3? m/s D. ?/3 m/s

298.  Maximum acceleration in above problem is
A. 4?2/9 m/s2 B. 3?2 m/s2
C. 2?2/3 m/s2 D. ?2/s m/s2

299.  A stone dropped from a baloon that was ascending at the rate of 30 ft/sec, reaches ground after 10 secs. The height of the baloon where stone was dropped was
A. 1310 ft B. 2310 ft
C. 3420 ft D. 4520 ft

300.  A bullet is fired vertically upwards with a velocity of 2200 ft/s. Bullet ascends to a height of
A. 48.300 ft B. 56,900 ft
C. 65,800 ft D. 75,000 ft




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