Describe the two hypotheses as to the origin or reason for the sun’s motion relative to the stars of the zodiac, first the self-centered view then the more modern less self- centered hypothesis.

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.