Molecular Physics | Thermodynamics Answers

A sample of gas is taken through cycle abca shown in the p-V diagram of Figure 2. The net work done is +2.0 J. Along path ab, the magnitude of the work done is 4.0 J, the energy transferred to the gas as heat is +5.0 J. Along path ca, the energy transferred to the gas as heat is +3.0 J.

(a) What is the change in internal energy along path ab?

(b) How much energy is transferred as heat along path bc?

a narrow glass tube 80 cm long opens at both the ends is half immersed in Hg . now top is closed and taken out of Hg a 20cm long Hg column remain in tube . find atmospheric pressure.

Heat can be removed from water at 0C and atmospheric pressure without causing the water to freeze, if done with little disturbance of the water. Suppose the water is cooled to –5C before ice began to form. What is the change in entropy per unit mass occurring during the sudden freezing that then takes place?

In a heat pump, heat from the outdoors at –5C is transferred to a room at 17C, energy being supplied by an electric motor. How many joules of heat will be delivered to the room for each joule of electric energy consumed, ideally?

A gas sample at 0C is heated until the average velocity of its molecules doubles. What is its new temperature?

m3 of air are stored at a pressure of 8105 N/m2. What would be the volume of the air at a pressure of 105 N/m2 if the temperature were unchanged

A gas in piston-cylinder assembly undergoes a polytrophic expansion, the initial pressure is 3 bar. initial volume is 0.1m3(cube) and the final volume is 0.2m3. determine the work done in kilojoules if

1. N =1.5

2.N=1

3.N=0

A 1.5 kg water bottle with potential energy of 17.9j. What is the height of the water bottle from ice surface

Mass of gas at an initial pressure of 28 and with an internal energy of 1500 kilo is contained in a well insulated cylinder of volume 006 metre cube. the gas is allowed to expand behind the Piston until its internal energy is 1400 kilo the law of expansion is PV square is equal to constant calculate the work done the final volume, the final pressure

A 10 kg lead brick is dropped from a height of 60 meters. If the energy change is converted to heat, how much the does the temperature of the brick change? The specific heat capacity of lead is 130 J/(kg C). Assume all the heat goes into the brick.

For full credit, give the equation that relates the relevant data to the answer and show the given values substituted into the equation to solve for the answer. Put proper units with all numbers.