A hiker walks 11 km due north from camp and then turns and walks 11 km due east. What is the total distance walked by the hiker?

The plum pudding model of the atom state that ?

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.

Which sections of the heating curve illustrate this process?