An object's motion changes
A. when there are no forces acting upon it.
B. only when a nonzero net force is applied to the object.
C. when the forces acting on the object remain balanced.
D. only if the object is at rest when a force acts upon it.

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

A6.0-μf air-filled capacitor is connected across a 100-v voltage source. after the source fully charges the capacitor, the capacitor is immersed in transformer oil (of dielectric constant 4.5). how much additional charge flows from the voltage source, which remained connected during the process?

What do we mean by the event horizon of a black hole?