If an 85 kg person was skydiving and reached terminal velocity, how much is the force of air resistance/drag in Newtons at that moment?

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 type of basaltic lava flow has a fairly smooth

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.