7. La luz que emite una nave espacial tarda 30 segundos en llegar a la Tierra. La distancia entre la Tierra y la nave es: a) 300.000 km
b) 1.200.000 km
c) 9.000.000 km
d) 25.000.000 km

What are atoms of the same element with varying number of neutrons

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is