A car is making a turn at speed v. The radius of the turn is r and the centripetal force on the car is F. If the car rounds the same curve at speed 2v, the required centripetal force is...

A body of mass m moves in a horizontal circle of radius r at constant speed v for one complete revolution. Which of the following statements is incorrect?

A straight length of tape unwinds from a roll rotating about a fixed axis with constant angular velocity, the radius of the roll decreasing at a steady rate. Which of the following graphs correctly shows how the variation of speed v at which the tape moves away from the roll with time t?

The clock on Big Ben has a minute hand of length 4.3 m and an hour hand of length 2.7 m. What is the ratio of the centripetal acceleration of a point on the tip of the minute hand to a point on the tip of the hour hand?

Which of the following statements is not true for a stone attached to a string and swung in a uniform vertical circular motion?