Afeather is dropped onto the surface of the moon. how far will the feather have fallen if it reaches the surface in 9.0 seconds? given: g on the moon -1.63meters/seconds^2

Abug is 12 cm from the center of a turntable that is rotating with a frequency of 45 rev/min . what minimum coefficient friction is required so that the bug stays on the turntable?

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

Aphoton is absorbed by an electron that is in the n = 3 state of a hydrogen atom, causing the hydrogen atom to become ionized. very far away from the nucleus, the released electron has a velocity of 750,000 m/s. what was the wavelength of the absorbed photon?