Un tren viaja a 35 m/s y debe reducir su velocidad a 18 m/s en 5segundos, a) ¿que distancia recorre en este tiempo?
b) ¿cual es su aceleración?

What is the relationship between the wavelength of a wave and it's energy?

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)