it is applied physics

The questions is :
1:A constant volume tank contains water vapor at a pressure of 600 kPa with unknown temperature. When the tank is cooled, it is discovered that the steam begins to condense at a pressure of 450 kPa. How high must the initial temperature have been?

2:Saturated steam of the refrigerant R-134a flows into a compressor at a pressure of 200 kPa and the volume feed 0.38 m3 / min. At the outlet of the compressor, the coolant has a pressure of 800 kPa. If the compressor develops the power 3.1 kW, what is the temperature at the outlet?

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3:In a cylinder with a moving piston, 0.13 kg of air is compressed from the atmosphere, ie with the pressure 100 kPa and 20 ° C, to the pressure 700 kPa and 200 ° C. Calculate the entropy change of the air in the cylinder and assume an ideal gas.

Water should be pumped from one basin to another 24 m higher. It is intended to use a pump which gives a pressure height of 41 m at the desired flow of 5.7 liters / s, as well as a tube of galvanized iron with a length of 510 m. The water is assumed to maintain a temperature of 10 ° C. Determine the pipe diameter required to get what you want
flow. Disposable resistors can be neglected.

5:In a countercurrent heat exchanger in a ventilation system, incoming air is heated on one side by means of outgoing room-temperature air. The area of ​​the heat exchanger is 40 m2 and the U-value is 10 W / (m2K). Air enters the cold side with temperature 10 ° C, and hot side with 22 ° C. Both airflows have a volume flow of 50 liters / s. Calculate the exit temperature on the cold side (ie the air entering the house).

6:A resistor of 20 Ω, a coil of 110 mH and a capacitor of 70 µF are connected in series to an alternating voltage of frequency 50 Hz.
(a) Write down the total (complex) impedance of this series connection in the form Z / α (ie amount and angle). (3)
Three such impedances Δ are now connected to a three phase network with mains voltage 400 V.
(b) What will be the active and reactive power respectively? (3)

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