A. r/2
B. 2r/3
C. r/A
D. 3r/2
E. 3r/A
Related Mcqs:
- A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will____________________?
A. remain horizontal
B. slant up towards direction of pull
C. slant down towards direction of pull
D. unpredictable
E. none of the above - If a suspended body is struck at the centre of percussion, then the pressure on die axis passing through the point of suspension will be___________________?
A. maximum
B. minimum
C. zero
D. infinity
E. same as the force applied - A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to___________________?
A. W
B. W sin (a + $)
C. Wtan(a + <|))
D. Wan(a-)
E. Wtana - Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction__________________?
A. along the plane
B. horizontally
C. vertically
D. at an angle equal to the angle of friction to the inclined plane
E. unpredictable - The C.G. of a plane lamina will not be at its geometrical centre in the case of a______________?
A. right angled triangle
B. equilateral triangle
C. square
D. circle
E. rectangle - The center of percussion of the homogeneous rod of length L suspended at the top will be__________________?
A. L/2
B. L/3
C. 3L/4
D. 2L/3
E. 3L/8 - Center of percussion is______________?
A. the point of C.G.
B. the point of metacentre
C. the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
D. point of suspension
E. the point in a body about which it can rotate horizontally and oscillate under the influence of gravity - The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of__________________?
A. friction
B. limiting friction
C. repose
D. kinematic friction
E. static friction - The C.G. of a solid hemisphere lies on the central radius 3r_______________?
A. at distance — from the plane base 3r
B. at distance — from the plane base 3r
C. at distance — from the plane base 3r
D. at distance — from the plane base or
E. at distance — from the plane base - A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if______________?
A. the floor is smooth, the wall is rough
B. the floor is rough, the wall is smooth
C. the floor and wall both are smooth surfaces
D. the floor and wall both are rough sur-faces
E. will be in equilibrium under all condi-tions
