Which would hit the ground first if dropped from the same height in a vacuum a feather or a metal bolt

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

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

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e