A particle inside a hollow sphere of radius r, having coefficient of friction -rr can rest upto height of__________________?

Related Mcqs:

1. Center of gravity of a thin hollow cone lies on the axis at a height of________________?

   A. one-fourth of the total height above base
   B. one-third of the total height above base
   C. one-half of the total height above base
   D. three-eighth of the total height above the base
   E. none of the above

2. Dynamic friction as compared to static friction is________________?

   A. same
   B. more
   C. less
   D. may be less of more depending on nature of surfaces and velocity
   E. has no correlation

3. Coulomb friction is the friction between_________________?

   A. bodies having relative motion
   B. two dry surfaces
   C. two lubricated surfaces
   D. solids and liquids
   E. electrically charged particles

4. Pick up wrong statement about friction force for dry surfaces. Friction force is________________?

   A. proportional to normal load between the surfaces
   B. dependent on the materials of contact surface
   C. proportional to velocity of sliding
   D. independent of the area of contact surfaces
   E. none of the above is wrong statement

5. A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t – 4), the acceleration of the particle will be given by the equation_________________?

   A. 3t2-lt
   B. 3t2+2t
   C. 6f-8
   D. 6f-4
   E. 6t2-8t

6. Coefficient of friction is the__________________?

   A. angle between normal reaction and the resultant of normal reaction and the limiting friction
   B. ratio of limiting friction and normal reaction
   C. the friction force acting when the body is just about to move
   D. the friction force acting when the body is in motion
   E. tangent of angle of repose

7. 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

8. The coefficient of friction depends on_________________?

   A. area of contact
   B. shape of surfaces
   C. strength of surfaces
   D. nature of surface
   E. all of the above

9. The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is_________________?

   A. same
   B. double
   C. half
   D. four times
   E. one fourth

10. A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly________________?

    A. 38 m
    B. 62.5 m
    C. 96 m
    D. 124 m
    E. 240 m