The Sun fuses about 600 billion kilograms of hydrogen each second. Based on your result from part A, calculate how long the Sun's initial supply of hydrogen can last. Give your answer in both seconds and years. Express your answer using two significant figures.

Thermodynamics T-11 All air is removed (vacuumed) from a 2 liter closed container that contains 200 ml of Liquid A and 600 ml of Liquid B at a temperature of 20C. At this temperature Liquid A has a density of 0.825 g/ml and vapor pressure of 25 kPa. Liquid B has a density of 0.750 g/ml and vapor pressure of 15 kPa. What is the mol fraction of vapor from Liquid A in the head space above the liquid surface? A) .25 B) .38 C) .63 D) .75

NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Oxygen is heated from 700 to 1000 R. Determine the enthalpy energy change Ah of oxygen, in Btu/lbm, using the cp value at the average temperature from the table. (You must provide an answer before moving on to the next part.) The enthalpy energy change of oxygen is 218 Btu/lbm.

Subject: mechanical

The attached figure shows a gas contained in a vertical piston– cylinder assembly, where D = 10 cm. A vertical shaft whose cross-sectional area is 0.8 cm2 is attached to the top of the piston. The total mass of the piston and shaft is 25 kg. While the gas is slowly heated, the internal energy of the gas increases by 0.1 kJ, the potential energy of the piston–shaft combination increases by 0.2 kJ, and a force of F = 1668 N is exerted on the shaft as shown in the figure. The piston and cylinder are poor conductors, and friction between them is negligible.The local atmospheric pressure is 1 bar and g = 9.81 m/s2. (Patm = 1 bar)     Determine, (a) the work done by the shaft, (b) the work done in displacing the atmosphere, and (c) the heat transfer to the gas, all in kJ.

An electric hot water heater consumes 3.1 kilowatts of electricity and converts it to heat. How long will it take the water heater to heat a 67 gallon tank of water from 10 degrees Celsius to 50 degrees Celsius? (1 kilogram of water is 0.37 gallons, 1 Calorie = 4200 J).  It may be helpful to refer back to the weekly handout for guidance on this problem. Your final answer should be in minutes (rounded to the nearest 10 minutes).

In a given experiment, we want to study the expansion of a gas from state i to state f by three different paths in the pV diagram. Based on the following figure, where the pressure is indicated in atmospheres and the volume in liters, determine the work done by the gas, in joules: (a) Along the path iaf (b) Along the path if. (c) Along path ibf.

Using 1st and 2nd law of thermodynamics for irreversible expansion of Krypton: Krypton (ideal monatomic gas) is confined in one-fourth of a 48-litre container. The other part of the container is evacuated. When the partition is removed, the gas expands and fills the whole container, while the system loses 400J of heat to the environment at 290K. It is found that in the final state, the Krypton is at p2 = 5.5bar, T2 = 400K. Is this process possible or not? (?k?????? = 83.8 kg/kmol)

P-4 Please I need help with this question needed a very clear and step-by-step explanation and needed with clear handwriting please, will be really appreciated your help.