1) A ball is connected to a string and spun around horizontally as shown.

Which diagram correctly shows the horizontal forces acting on the ball at the instant shown?

2) An object is fixed to one end of a Iight rod which rotates in a vertical circle at constant speed.

Which graph could represent the variation of tension T in the rod with angle θ?

3) The diagram represents a cyclist making a left turn on a rough road surface at constant speed v, as viewed from behind. The total mass of the bicycle and rider is m and their combined centre of gravity is at G.

If R is the resultant force of the normal contact force and the frictional force, which vector diagram represents the directions of the forces acting on the bicycle and its rider?

4) One complete revolution is 360º or

5) When the aircraft Concorde is moving in a horizontal plane at a constant speed of 650 m s^–1, its turning circle has a radius of 80 km. What is the ratio of the centripetal force to the weight of the aircraft?