Car a travels along a freeway at 110kmh-1 going east. car b, travelling west at 120kmh-1 spins out of control and veers towards car a (across the median strip) at an angle 30° off course. a. what is the velocity of car b relative to car a?

Avalue that describes how heavy an object is and is related to the force of gravity 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?

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?