A 710 kg car drives at a constant speed of 23 m/s . it is subject to a drag force of 500 n.

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.

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?

Which sections of the heating curve illustrate this process?