# Question 2.4: When a system is taken from state a to state b in the accomp...

When a system is taken from state a to state b in the accompanying figure along path acb, 100 J of heat flows into the system and the system does 40 J of work.

(a) How much heat flows into the system along path aeb if the work done by the system is 20 J?

(b) The system returns from b to a alongpath bda. If the work done on the system is 30 J, does the system absorb or liberate heat? How much?

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Question: 2.7

## Air at 1 bar and 298.15 K is compressed to 3 bar and 298.15 K by two different closed-system mechanically reversible processes: (a) Cooling at constant pressure followed by heating at constant volume. (b) Heating at constant volume followed by cooling at constant pressure.Calculate the heat and ...

In each case take the system as 1 mol of air conta...
Question: 2.15

## A steam turbine operates adiabatically with a power output of 4000 kW. Steam enters the turbine at 2100 kPa and 475°C. The exhaust is saturated steam at 10 kPa that enters a condenser, where it is condensed and cooled to 30°C. What is the mass flow rate of the steam, and at what rate must cooling ...

The enthalpies of entering and exiting steam from ...
Question: 2.14

Question: 2.13

## Air at 1 bar and 25°C enters a compressor at low velocity, discharges at 3 bar, and enters a nozzle in which it expands to a final velocity of 600 m·s^−1 at the initial conditions of pressure and temperature. If the work of compression is 240 kJ per kilogram of air, how much heat must be ...

Because the air returns to its initial conditions ...
Question: 2.12

## For the flow calorimeter just discussed, the following data were taken with water as the test fluid: Flow rate = 4.15 g . s^−1 t1 = 0°C t2 = 300°C P2 = 3 bar Rate of heat addition from resistance heater = 12,740 W The water is completely vaporized in the process. Calculate the enthalpy of steam ...

If Δz and $Δu^{2}$ are negligible and...
Question: 2.11

## An insulated,electrically heated tank for hot water contains 190 kg of liquid water at 60°C. Imagine you are taking a shower using water from this tank when a power outage occurs. If water is withdrawn from the tank at a steady rate of m = 0.2 kg·s^−1, how long will it take for the temperature ...

This is an example of the application of Eq. (2.28...
Question: 2.10

## Show that Eq. (2.28) reduces to Eq. (2.3) for the case of a closed system. ...

The second term of Eq. (2.28) is omitted in the ab...
Question: 2.9

## In a major human artery with an internal diameter of 5 mm, the flow of blood, averaged over the cardiac cycle, is 5 cm^3·s^−1. The artery bifurcates (splits) into two identical blood vessels that are each 3 mm in diameter. What are the average velocity and the mass flow rate upstream and ...

The average velocity is given by the volumetric fl...
Question: 2.8