Which coefficient of o2 is needed to balance the equation c3h8 + o2 → 3co2 + 4h2o? 2 3 5 6

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

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.

Which of the following is the phase that results when the moon is on the opposite side of the earth from the sun? a. quarter moon b. crescent moon c. new moon d. full moon