In outer space, where there is no gravity or air resistance, an astronaut pushes on two moon rocks, using 12N of force on each. One rock has a mass of 2 kg, the other has a mass of 4 kg. Which statements are true? (Mark all true statements)

A. Both rocks will push back at the astronaut with 12 N.
B. Since the astronaut is weightless, he cannot push on the rocks.
C. Since both rocks are weightless, they do not push back on the astronaut.
D. The 4 kg rock pushes back on the astronaut twice as hard as the 2 kg rock.
E. Since both rocks are weightless, they will have the same acceleration.

A40.0 l tank of ammonia has a pressure of 12.7 kpa. calculate the. volume of the ammonia if it’s pressure is changed to 8.4 kpa while its temperature remains constant.

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.