Molecular Physics | Thermodynamics Answers

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?

Room temperature constant 20 ° C and relative humidity 20%. How many grams of water must be added to the room air to obtain relative humidity to rise to 60%?

Outdoor air temperature is 0 ° C and relative humidity 90%. The air is blown into the house
and heated to 20 ° C. What is the new relative humidity?

The humidity meter shows the relative humidity of the room air at 78% when the temperature
is 22 ° C. What is the absolute humidity in g / m3 of air and what is Dew point (temperature)?

Room capacity is 250 m3, air temperature 18 ° C and relative humidity 45%.
How many kilograms of water in the room air and how much air can fit in the air
water as water vapor? The total pressure is 101.3 kPa.

Calc the change in entropy of a system containing 1kg of ice at 0degree Celsius which melts reversibly to water at d same temperature.latern heat of fusion of melting is 79.6cal/g