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Circular Motion Centre Of Mass QUESTIONS AND ANSWERS

IIT JEE : Circular Motion Centre Of Mass QUESTIONS AND ANSWERS :: part1 : 16 to 20

Following IIT JEE Entrance Multiple choice objective type questions and answers will help you in Maths, Physics and Chemistry 2024 examinations :

16.A stone of mass 1 kg is tied at one end of string of length 1m. It is whirled in a vertical circle at constant speed of 4 m/s. The tension in the string is 6N when the stone is at: (g = 10 m/second square)

top of the circle

bottom of the circle

half way down

none of these

17.The speed of a particle moving in a circle is increasing. The dot product of its acceleration and velocity is:

negative

zero

positive

may be +ve or �ve

18.A car moving on a horizontal road may be thrown out of the road in taking a turn:

by a gravitational force

due to lack of proper centripetal force

due to the rolling frictional force between the tyre and road

due to the reaction of the ground

19.A small body of mass m slides down from the top of a hemisphere of radius R. The surface of block and hemisphere are frictionless. The height at which the body loses contact with the surface of the sphere is:

3/2 R

2/3 R

1/2 R

1/3 R

20.When a simple pendulum is rotated in a vertical plane with constant angular velocity, centripetal force is:

maximum at highest point

maximum at lowest point

same at all points

zero

More Circular Motion Centre Of Mass QUESTIONS AND ANSWERS available in next pages