Un corredor arranca a 4m/s2 durante 1.8segundos, después disminuye su ritmo de velocidad a razón de 0.5m/s2 durante 2.3 segundos. Calcule: c)La velocidad final que alcanzó.
d)La distancia total recorrida

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.

Since the energy was not raising the temperature of the water during these segments, what was the energy used to do instead? your answer must include an explanation of what is happening to the molecules.

It takes a lot of energy to get the temperature of water to increase and eventually boil because water has a high heat.