Hurry &
which of the following is not an example of work?
a.) pushing a box across the floor
b.) picking up a box off the floor
c.) holding a tray in the cafeteria line
d.) raising a barbell over your head

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value

Specific heat refers to the amount of heat required to change 1 gram of a substance by degree(s) celsius