When an object is falling and reaches a constant velocity, the net force on the object is and the weight of the object is equal

a. zero; the mass of the object
b. 10; the speed at which the object is falling
c. 10; acceleration due to gravity
d. zero; the force of air resistance against the object

Describe the path of a ray that approaches a mirror parallel to the principal axis.

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

Aspecimen of oil having an initial volume of 580cm^3 is subjected to a pressure increase of 4.0 mpa, and the volume is found to decrease by 0.40 cm^3. (a) what is the bulk modulus of the material? (b) what is the compressibility of the material?