Which statement about a flat magnet that can stick onto a refrigerator is true? -It has no poles.
-It has only a north pole, where Santa lives.
-It has only south poles.
-It has two poles.

What determines the amount of inertia an object has

Which situation will produce the greatest change of momentum

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.