What is the density of a 10.0 g object with a volume of 4.00 cm^3?

What are the factors that affect the resistance of a wire?

How can you increase the strength of an electromagnet?

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.