Question

Q5. An efficiency consultant is studying the power stroke of a four-stroke engine and determines the following:

1. As the piston is forced down, the mixture of combustion products and air undergoes an adiabatic expansion.
2. The engine is running at 3,100 cycles/min.
3. The gauge pressure immediately before the expansion is 25.0 atm.
4. The volumes of the mixture immediately before and after the expansion are 50.0 cm³ and 400 cm³, respectively (figure below).
5. The time interval for the expansion is one-fourth the period of the cycle.
6. The mixture behaves like an ideal diatomic gas with a specific heat ratio of 1.40.

Determine the average power (in kW) generated during the power stroke.

Q12.

A 1.00-L insulated bottle is full of tea at 90.5°C. You pour out a mug of tea and immediately screw the stopper back on the bottle. Find the change in temperature of the tea remaining in the bottle that results from the admission of air at room temperature. (Let the room temperature be 20.0°C and assume that you poured out 205 cm³ of tea. Take the molar mass of air as 28.9 g/mol and ρ_air = 1.20 10^-3 g/cm³. Here we define a "monatomic ideal gas" to have molar specific heatsC_V =

3

2

R andC_P =

5

2

R, and a "diatomic ideal gas" to haveC_V =

5

2

R andC_P =

PLEASE HELP me with these two questions ASAP!! I will rate you right away!!

12.-15 points SerPSE10 20.2.P.013 My Notes Ask Your Teacher A 1.00 L nsulated bottle is full of tea at 90.5 С You pour out a mug of tea and immediately screw the stopper back on the botte. Find the change n temperature of the tea remaining in the bottle that results from the admission of air at room temperature. (Let the room temperature be 20.0°C and assume that you poured out 205 cm3 of tea. Take the molar mass of air as 28.9 g/mol and ραǐr-1.20 x 10-3 g/cm3. Here we define a "monatomic ideal gas" to have molar specific heats Cy-R and Cp-R, and a "diatomic ideal gas" to have CV-R and C,--R.) oC Need Help?Read It

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