Molecular Physics | Thermodynamics Answers

Room temperature is 10 ° C and relative humidity 75%. Temperature raised to 20 ° C. What is the relative humidity of the air now? How much water should be added to the air to get 50% relative humidity? The temperature remains constant.

A volume of 150 m3 of room air contains 1800 g at 22 ° C water vapor. What is the relative humidity of room air? Pressure 101.3 kPa.

The water in the water heater is heated at 80 ° C overnight and its average temperature must not fall below 55 ° C. How much water should be in the reservoir to store 25 kWh of thermal energy? The reservoir's own thermal capacity should be insignificant.

500 g of water at 18 ° C and 0 g of 80 g of ice cubes are added. Dish own heat capacity is 100 J / K. Do you melt everything? If it melts, then what is the temperature of the final state, and if not melt, how much ice will remain without melting?

The diameter of the round brass rod is 30.05 mm and the steel ring the inner diameter is 30.00 mm at 20 ° C. At what temperature the steel ring must be heated to fit the brass rod inside?

The internal thermal energy of the steel body is 10 kJ at 0 ° C. According to one
of the same and the same mass of steel body the thermal energy is 25 kJ. What is the temperature of this second body?

The diameter of the Styrox ball is 38 cm and the density is 84 kg / m³. How much power
needed to keep the ball completely under the water (1000 kg / m³)?

A monatomic ideal gas that is initially at a pressure of 1.5x105 N/m2 and has a volume of
0.08 m3 is compressed adiabatically to a volume of 0.04 m3 (a) What is the final pressure?
(b) How much work is done by the gas? (c) What is the ratio of the final temperature of
the gas to its initial temperature?

The air flows into the 0.5 kg / s heat exchanger at + 5 ° C and the relative humidity 20%.
How much heating power is needed and how much water must be injected into the air when
it wants to be + 30 ° C and 50%? The required power is

The compressed air compressor absorbs air at 101.3 kPa, 10 ° C and relative humidity
60%. After the compressor, the compressed air temperature is 30 ° C and the pressure is 300 kPa. What is the relative humidity of the compressed air produced?