Molecular Physics | Thermodynamics Answers

Fermi temperature when number density increased to eight times

12 g of gas at a temperature of 7°C amounts to 0.004 m^3 volumes. After the gas is heated at constant pressure its density reaches 6*10 ^-4 g/cm^3.
to what temperature the gas is warmed up?

if the car suddenly speeds up which side does the passenger tend to lean?

in the compression stroke of the gas engine the work done on the gas by the piston is 70 kj/kg and the heat rejected to the cooling water is 42 kj /kg calculate the change os specific internel energy stating whether it is gain or loss

In an air compressor the compression takes place at a constant internal energy and 50 kj of heat are rejected to the cooling water for every kilogram of air. Calculate the work input for the compression stroke per kilogram of air

0.05 m3 of a gas at 6.9 bar expands reversibly in acylinder behind a piston according to the law
PV1.2 =constant untill volume is 0.08 m3.calculate the work done by the gas and sketch the process on p-vdiagram

4. A turbine operating under steady flow conditions receives steam at the following state. pressure 13.8 bar, specific volume 0.143 m3/kg, i.e., 2590 kJ/kg, velocity 30 m/s. The state of the steam leaving the turbine is pressure 0.35 bar, specific volume 4.37 m3/kg, i.e., 2360 kJ/kg, velocity 90 m/s. Heat is lost to the surroundings at the rate of 0.25 kJ/s. If the rate of steam flow is 0.38 kg/s, what is the power developed by the turbine?

The gases in the cylinder of an internal combustion engine have a specific internal energy of 800 kJ/kg and a specific volume of 0.06 m3/kg at the beginning of expansion. The expansion of the gases may be assumed to take place according to pn1.5=constant, from 55 bar to 1.4 bar. The specific internal energy after expansion is 230 kJ/kg. Calculate the heat rejected to the cylinder cooling water per kilogram of gases during the expansion stroke.
Ans: 104 kJ/kg
Please explain how this answer is the result

A mass of gas at an initial pressure of 28 bar and with an internal energy of 1500 kJ, is contained in a well-insulated cylinder of volume 0.06 m3. The gas is allowed to expand behind a piston until its internal energy is 1400 kJ; the law of expansion is PV2=Constant. Calculate
1. Work done;
2. The final volume;
3. The final pressure;
4. Draw P-V diagram.

A steady flow of steam enters a condenser with a specific enthalpy of 2300 kJ/kg and a velocity of 350 m/s. The condensate leaves the condenser with a specific enthalpy of 160 kJ/kg and a velocity of 70 m/s. Calculate the heat transfer to the cooling fluid per kilogram of steam condensed.