Molecular Physics | Thermodynamics Answers

A car tire makes contact with the ground on a rectangular area of 12 cm by 18 cm. If the car’s mass is 925 kg, what pressure does the car exert on the ground as it rests on all four tires?

1 kg of steam at 7 bar, entropy 6.5 kJ/kg K, is heated reversibly at constant pressure until the temperature is 250℃. Calculate the heat supplied.

1 kg of steam at 100 bar and 370℃ expands reversibly in a perfectly thermally insulated cylinder behind a piston until the pressure is 38 bar and the steam is then dry saturated. Calculate the work done

Calculate the position of Fermi level Ef at 200K for germanium crystal containing

10x1022 Boron atom per meter cube.

Consider two dimensional square lattice site of side 0.5nm.At what electron

momentum values do the sides of the first Brillouin zone come? What is the

energy of free electron with this momentum.

A solution of salt water raised the boiling point of water from a 100°C to 102.5°C. What is the molality of the solution? Assume the Kb of water is 0.51°C/m.

One end of a copper poker is placed in a fire with temperature of 600°C, while the other end is kept at room temperature (25°). The poker is 1,5 m long and has a radius of 3 x 10-3 m.

A liquid of unknown specific heat at a temperature of 20oC was mixed with water at 80oC in a well-insulated container. The final temperature was measured to be 50oC, and the combined mass of the two liquids was measured to be 240g. In a second experiment with both liquids at the same initial temperatures, 20 g less of the liquid of unknown specific heat was poured into the same amount of water as before. This time the equilibrium temperature was found to be 52oC. Determine the specific heat of the liquid.

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Neon gas is used in manufacturing to create signs. If you run an electric current through the gas,

it will glow in neon colors. Unfortunately, when you run electricity through the gas, its

temperature increases. If the temperature starts at 50⁰C, it will raise to about 150⁰C after the

sign is on for 4 hours. The gases original volume was 5 L. What is the volume of the gas after

the sign is on for 4 hours

1. A copper cube with sides of length 40mm had its surface blackened. The cube is heated up to 500K and place inside a room at a constant temperature of 300K. Calculate the initial rate of temperature fall of the cube, assuming it is a perfect blackbody. Take S.H.C of Aluminium to be 400J/kg/K, density of aluminium-7800kg/m'.