. Mass 1 has a momentum of 20 kg*m/s. Mass 2 has a momentum of 50 kg*m/s. They have a perfectly elastic collision. After the collision, the momentum of Mass
1 is 15 kg*m/s. What is the momentum of Mass 2?

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?