When air moves from a region of high pressure to a region of low pressure, with no addition or subtraction of heat:
a. it expands
b. it undergoes adiabatic heating.
c. it contracts.
d. its molecules speed up

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

Choose all the answers that apply. our solar system: is in a spiral galaxy no longer includes pluto is made mostly of empty space is in the andromeda galaxy is the only known system that supports life

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?