How does bare soil surface type affect the amount of runoff?

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.

What happens when you slowly pulled the carboard?

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?