Three pounds mass of water in a piston–cylinder assembly, initially a saturated liquid at 15 lbf/in2, undergoes a constant pressure, internally reversible expansion to x2 = 90%. for this reversible process, determine the work by integrating p dv and the heat transfer by integrating t ds, each in btu.

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?

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion

Give an example in which the electrical energy changes to light energy