Question 11 : A body of mass m performing UCM with frequency n along the circumference of circle having radius r, force is given by
1. π²n²mr
2. 4π²n²m
3. 1/2 πnm²
4. 4πnm²
View Answer   Discuss with Members

Question 12 : A body of mass 100 gram, tied at the end of a string of length 3 m rotates in a vertical circle and is just able to complete the circle. If the tension in the string at its lowest point is 3.7 N, then its angular velocity will be ______ (g = 10 m/s2)
1. 3 rad/s
2. 2 rad/s
3. 4 rad/s
4. 1 rad/s
View Answer   Discuss with Members

Question 13 : A body of mass 500 gram is rotating in a vertical circle of radius 1 m. What is the difference in its kinetic energies at the top and the bottom of the circle?
1. 9.8 J
2. 19.8 J
3. 4.9 J
4. 2.8 J
View Answer   Discuss with Members

Question 14 : A body is moving along a circle with an increasing speed. It possesses?
1. No acceleration
2. tangential acceleration only (ar)
3. centripetal acceleration only (ac)
4. both tangential and centripetal acceleration (ar and ac)
View Answer   Discuss with Members

Question 15 : The tangential component of acceleration arises when?
1. speed of the object is constant.
2. speed of the object is changed.
3. speed of the object is maximum.
4. speed of the object is minimum.
View Answer   Discuss with Members

Question 16 : A body is moving along a circular path with variable speed. It has
1. a tangential acceleration
2. a radial acceleration
3. zero acceleration
4. both tangential and radial accelerations
View Answer   Discuss with Members

Question 17 : A body is allowed to slide on a frictional less track from rest under-gravity. The track ends in a circular loop of diameter D. What should be the minimum height of the body in terms of D, so that it may successfully complete the loop?
1. D
2. 5/4 D
3. 2D
4. 4/5 D
View Answer   Discuss with Members

Question 18 : A body is traveling in a circle at constant speed. It
1. has an outward radial acceleration
2. has an inward acceleration
3. has no acceleration
4. has constant velocity.
View Answer   Discuss with Members

Question 19 : The tangential component and centripetal component of acceleration are?
1. Similar to each other
2. Parallel to each other.
3. Perpendicular to each other.
4. Equal to each other.
View Answer   Discuss with Members

Question 20 : The centripetal component of acceleration arises when?
1. The direction propagation is changed.
2. The direction of motion is changed.
3. The direction of projectile is changed.
4. The direction of gravity is changed.
View Answer   Discuss with Members