A hot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. After time interval Δt, a crew member releases a ballast sandbag from the basket attached to the balloon. How many seconds does it take the sandbag to reach the ground?

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

The solar panels used by mark function because of the photoelectric effect. light shines on the cells causing electrons to be ejected from the metal, which produces an electric current. at night on mars, no light will fall on the solar cells and no electric current will be generated. according to your notes, what type of light is typically needed to cause the photoelectric effect? a)visible b)ultraviolet c)infrared

If forces acting on an object are unbalanced. true or false