A piston containing 0.30 kg of R-134a at 320 kPa and 130°C is cooled at constant volume until the pressure reaches 200 kPa. What is a good approximation for the final temperature? How much total heat was added to the system? g

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?

Three resistors are connected in series across a 15-v power supply. if the potential drops across resistors 1 and 2 are 4.1 volts and 3.1 volts, what is the exact potential drop (in volts) across resistor 3?

Which of hubble’s discovery support the big bang theory