What is transverse wave​

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

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?

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c