A. W
B. W sin (a + $)
C. Wtan(a + <|))
D. Wan(a-)
E. Wtana
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 - 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 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 resolved part of the resultant of two forces inclined at an angle 9 in a given direction is equal to__________________?
A. the algebraic sum of the resolved parts of the forces in the given direction
B. the sum of the resolved parts of the forces in the given direction
C. the difference of the forces multiplied by the cosine of 9
D. the sum of the forces multiplied by the sine of 9
E. the sum of the forces multiplied by the tangent of 9 - The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be______________?
A. r/2
B. 2r/3
C. r/A
D. 3r/2
E. 3r/A - The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, – ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be_________________?
A. 20 kg, – ve sense
B. 20 kg, + ve sense
C. 10 kg, + ve sense
D. 10 kg, – ve sense
E. 45 kg, + ve sense - A single force and a couple acting in the same plane upon a rigid body________________?
A. balance each other
B. cannot balance each other
C. produce moment of a couple
D. are equivalent
E. none of the above - Frictional force encountered after commencement of motion is called________________?
A. post friction
B. limiting friction
C. kinematic friction
D. frictional resistance
E. dynamic friction - If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either__________________?
A. meet in a point
B. be all parallel
C. at least two of them must meet
D. all the above are correct
E. none of the above - The weight of a body is due to____________________?
A. centripetal force of earth
B. gravitational pull exerted by the earth
C. forces experienced by body in atmos-phere
D. force of attraction experienced by par-ticles
E. gravitational force of attraction towards the centre of the earth
