Abus goes 500km east from town a to town b in the morning and comes back halfway in
the evening travelling west. what is the distance and displacement of the bus?

Jackson is designing a new heater, and he wants to experiment with different thermally conductive materials. which of these materials would be useful in conducting heat?

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

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.