Acatapult’s lever holds a cannonball. the lever is attached to a tightly held rope. when the rope is released, the lever springs forward and launches the cannonball. when the rope is held tightly, which form of energy does it possess? a. thermal b. nuclear (not) c. gravitational d. elastic

Need in all of themmm only answer if you know pls

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.

If you place a magnet under a clear dish, and sprinkle iron fillings over it, above what part of the magnet will most of the fillings gather