You are an astronaut floating in DEEP space (very little gravity). If you come upon a small metal object, what can you do to test if the object has MORE or LESS mass than you? What would happen? Explain

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

Anybody wanna ? (picture included? )

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