Technician A says the Schrader-type service valve is automatically opened when the service hose is installed. Technician B says the Schrader-type service valve is automatically closed when the service hose is removed. Who is correct?
A. Technician A
B. Technician B
C. Both Technician A and B
D. Neither Technician A nor B

What happens to light waves from a star as the star moves away from earth?

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?

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f