A piston absorbs 25 J of heat from its surroundings while expanding from 0.0003 m² to 0.0006 m3 at a constant pressure of 1.0 x 105 Pa. What are the
correct values for heat and work for the piston?
A. Q= +25 J, W =+30 J
B. Q=-25 J, W= +30 J
C. Q=+25 J, W= -30 J
D. Q=-25 J, W =-30 J

Abookcase has a mass of 38 kg and the coefficient of friction between it and the floor is 0.82 what is the maximum force of friction between the bookcase and the floor a 372n b 305n c 412n d 449n

What’s #16 asking and how do i solve it?

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.