6 A car travels around a circular track at constant speed.
(a) Why is it incorrect to describe the circular motion as having constant velocity?
(b) A force is required to maintain the circular motion.
() Explain why a force is required.
[2]
(ii) In which direction does this force act?
[1]
(iii) Suggest what provides this force.
[2]
[Total: 6]

Aplane takes off from an airport and flies to town a, located d1 = 215 km from the airport in the direction 20.0° north of east. the plane then flies to town b, located d2 = 230 km at 30.0° west of north from town a. use graphical methods to determine the distance and direction from town b to the airport. (enter the distance in km and the direction in degrees south of west.)

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?