In an isolated system, a red ball of mass m moves to the right with speed v. It strikes a green ball, of mass 2m, which was initially stationary. After the collision, the red ball remains stationary. How does
the green ball move?

A. To the left, with speed v/2

B. To the right with speed 2v

C. To the right, with speed v/2

D. To the left with speed 2v

Note: the following questions are unrelated to the balmer series or the martian. refer to your course notes. a sun-sized star will spend most of its lifetime as a: white dwarf b. red giant c. protostar d. main-sequence star

Oxygen and nutrients are moved through the body by the: a. circulatory system c. lymphatic system b. digestive system d. reproductive system

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve