Molecular Physics | Thermodynamics Answers

Which wave property has the same value for all x rays travelling in the air

A small probe is made of stainless steel and has a length of 60 mm when it stored at a temperature of 18°C.

What is the change in length of the probe when it is being used in an operation and it has warmed up to 36°C? (to 2 s.f and in mm)

[α_steel = 16.0×10⁻⁶ K⁻¹]

A solid of mass 200g is heated to a temperature of 80 degree Celsius and is found to melt just 40g of ice. Specific latent heat of ice = 3.36*10^6 J kg-1 K-1 , calculate specific heat capacity of solid.

1) A 40-m vertical column of fluid with density of 1872 kg/m3 is located where g = 9.65 g/m2. Find the pressure at the base of the column.

2) Two liquids of different densities (ρ1 = 1500 kg/m3 , ρ2 = 500 kg/m3) are poured together into a 120-liter tank, filling it. If the resulting density of the mixture is 820 kg/m3, find the respective amounts of liquids used. Also find the weight of the mixture; local g= 9.675 m/s2.

3) If a pump discharges 284 liters per minute of water whose density is 985 kg/m3, find (a)the mass flow rate in kg/min, (b) the total time required to fill a vertical tank 3 m in diameter and 4 m high.

6)Fahrenheit and a Celsius thermometer are both immersed in a fluid and indicate identical numerical readings. What is the temperature of the fluid expressed as °R and as °K?

a certain gas is compressed reversibly from 1 bar , 17 degrees to a pressure of 5bar in a perfectly thermally insulated cylinder the final temperature being 77degrees . The work done on the gas during the compression is 45kj/Kg. Calculate Cv alpha and R

In a thermodynamic experiment 25kg of water at 95C is mixed with 35kg of water at 35C, the pressure being taken as constant and the temperature of the surrounding being 15C(Cp of water=4.2kJ/kgK). Calculate total available energy, final temperature after mixing and decrease in available energy due to mixing.

on a day when air temperature is 34°c (normal skin temperature) a cyclist is maintaining a speed of 15 km/hr. how many grams of water must this cyclist evaporate each minute to get rid of the body heat produced by his activity?

Every household has at least one refrigerator, many hotels have ice makers and most of us like, you may have wondered how much heat energy a refrigerator/ice maker take from water to make ice. Compute the amount of energy an ice maker extracts from 200g of water at 34°c manufacture ice at 0°c.

(a) Two moles of an ideal gas occupy a volume V. The gas expands isothermally and reversibly to a volume 3V. (i) Is the velocity distribution changed by the isothermal expansion? Explain. (ii) Use Eq. (Microscopic state) to calculate the change in entropy of the gas. (iii) Use Eq. (reversible isothermal process) to calculate the change in entropy of the gas. Compare this result to that obtained in part (ii).

(a) You make tea with 0.250 kg of 85.0 degrees Celsius water and let it cool to room temperature (20.0 degrees Celsius) (i) Calculate the entropy change of the water while it cools. (ii) The cooling process is essentially isothermal for the air in your kitchen. Calculate the change in entropy of the air while the tea cools, assuming that all of the heat lost by the water goes into the air. What is the total entropy change of the system tea + air?

(b) An ice making machine operates in a Carnot cycle. It takes heat from water at 0.0 degrees Celsius and rejects heat to room at 24.0 degrees Celsius. Suppose that 85.0 kg of water at 0.0 _C are converted to 0.0 degrees Celsius. (i) How much heat is discharged into the room? (ii) How much energy must be supplied to the device?