Nitrogen gas, ch4, flowing in a 5-cm-diameter pipe at 15°c and 200 kpa, at the rate of 0.05 kg/s, encounters a partially closed valve. if there is a pressure drop of 30 kpa across the valve and essentially no temperature change, what are the velocities upstream and downstream of the valve?

answer: b.

explanation:

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

the answer is false. this is because for ice to melt, it requires latent heat of melting. latent heat means heat energy required to change phase without any increase in temperatures. therefore, the ice will take energy from the environment to melt hence atmospheric temperatures will reduce.