A man lifts a stone weighting 300 g from the ground to a height of 2m and throws it horizontally with a velocity of 6 m/sec. The work done by the man is
A.5.886 J
B.7.686 J
C.8.343 J
D.11.286 J
Category: Applied Mechanics Mcqs
The weight of a 72 kg man on earth’s surface is
A.706.3 N
B.760 N
C.100.3 N
D.72 N
M.I. of sphere of 0.5 m radius about a mutually perpendicular axis (Z-axis) when its M.I. about X-axis and Y-axis are 50 kgm2 and 50 kgm2 is
A.25 Kgm2
B.100 Kgm2
C.50 Kgm2
D.12.5 Kgm2
The earth’s gravitational force field is said to be conservative force field because
A.The value of gravitational force rise is fixed
B.The direction of gravitational force is fixed
C.The work acted by the earth’s gravitational field on a particle is independent on the path traced out by the particle
D.The work acted by the erth’s gravitational field will cause same path for all particles irrespective of their mass
E.The gravitational field has only single directional component always acting normal to a body
Static friction is always
A.greater than the dynamic driction
B.less than the dynamic friction
C.equal to the dynamic friction
D.either greater or more than the dynamic friction
A locomotive of weight 100 tonnes is attached to train of wagons weighing 1000 tonnes. The locomotive pulls the wagons with a constant velocity of 36 km/hour. When the coupling between the train and wagons breaks, the wagons roll on 95 m in 10 sec. The distance between the locomotive and the wagons at this instant assuming that the forces acting on the train are unaltered would be
A.0.36 m
B.0.44 m
C.0.5 m
D.0.66 m
E.0.77 m.
The dimensions of modulus of elasticity are
A.MLT-1
B.MLT-2
C.ML-1T-2
D.ML-2T-1
Efficiency of a screw jack in maximum when its 31 helix angle, ? is
A.45?
B.?
C.45 + ?/2
D.45 – ?/2
The x coordinate of the centroid of the area enclosed by the parabolas y = x2 and x = y2 will be
A.0.43
B.0.44
C.0.45
D.0.46
