Why the helium-oxygen mixtures are used by divers
Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat ailments. What percent (by moles) of He is present in a helium-oxygen mixture having a density of 0.498g/l at 25 degrees C and 721 mmHg?
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Assume you have one hydrogen molecule in a 1.00 L flask at room temperature. Calculate the average energy of the H2 molecule (= 3/2kT) and assume this is the energy level of the particle in a cubic box (10 cm on each side = 1000 cm3 = 1.00 L).
A sprinter explodes out of the starting block with an acceleration of +4.5 m/s2, which she sustains for 1.5 s. Then, her acceleration drops to zero for the rest of the race.
There is no heat transfer between the heater and the surroundings. Evaluate each term in the general entropy balance for the second law of thermodynamics.
A golf ball is struck with a five iron on level ground. It lands 91.8 m away 4.20 s later. What was (a) the direction and (b) the magnitude of the initial velocity?
Determine the work required to compress air in an isentropic steady-flow process from 50 kPa to 500 kPa. What is the exit temperature if the inlet temperature is -18.15°C?
If it is stipulated that an equal number of men and women are to be selected (6 men from the group of 65 men and 6 women from the group of 35 women), what is the probability that Mary's name will be selected? (Round your answer to four decimal pla
You decide to take the plunge and go bungee jumping. Being a college student, you do this on the cheap, and buy a bungee cord with a spring constant of k = 500 N/m and a length of L = 8.0 m. You choose a bridge where you tie the end of the cord so
What volume does mass of the boiled-off natural gas occupy if the temperature is 15°C at 100 kPa pressure, assuming ideal gas behavior?
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