Aclosed rigid tank contains 1.5 kg of refrigerant, initially at p1 = 1.1 mpa and u1 = 277.25 kj/kg. the tank is fitted with a paddle wheel that transfers energy to the refrigerant at a constant rate of 0.1 kw. after 20 minutes of stirring, the refrigerant is at p2 = 0.85 mpa and u2 = 247.93 kj/kg. assume changes in kinetic and potential energy are negligible. a. determine work [kj] during the process (magnitude and direction) b. determine heat transfer [kj] during the process (magnitude and direction)

Ineed extreme for task 2. my student number is 571721. many to whoever solves this correctly, im in debt to you.

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

When measuring volume, why is it important to use the correct tools and units to attain the greatest accuracy? use specific examples from the lab to support your answer. (5 points)