The wave number of the light emitted by a certain source is 2 x 108m-'. The wavelength of this light will be (a) 500 nm (b) 500 m (d) 5 x 10 m (c) 200 nm

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?

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.