Samuel places a ladder against his house. The base of the ladder is 6 feet from the house and the ladder is 10 feet long.
How high above the ground does the fadder touch the wall of
the house?
a 10 feet
b 6 feet
C 16 feet
d 8 feet

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.