A 70 Newton dog ran across the yard. What do we know about the dog? The dog's volume
The dog's weight
The dog's mass
The dog's acceleration

The air that we breath is made mostly of which gaseous molecule

9.98 kg of r-134a at 300 kpa fills a rigid container whose volume is 14 l. determine the temperature and total enthalpy in the container. the container is now heated until the pressure is 600 kpa. determine the temperature and total enthalpy when the heating is completed. use data from the steam tables.

In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?