In an ideal Rankine cycle with reheat, superheated steam vapor enters the turbine at 10 MPa and
480 °C, while the condenser pressure is 6 kPa. Steam expands through the first-stage turbine to
0.7 MPa and then is reheated to 480 °C
a) Calculate the total heat addition, net work of the cycle, heat extraction through condenser,
and thermal efficiency of this ideal Rankine cycle with reheat. [25]
b) Calculate the same quantities assuming that the pump and each turbine stage have an
isentropic efficiency of 80%. [25]
c) Draw p-v diagrams for these two cycles  

do only part c)

A 2500-lb automobile is moving at a speed of 35 mi/h when the brakes are fully applied, causing all four wheels to skid. a) Determine the time required to stop the automobile on dry pavement (?k = 0.75). (Round the final answer to two decimal places.) b) Determine the time required to stop the automobile on an icy road (?k = 0.10). (Round the final answer to two decimal places.)

2. Two different hardening processes, (1) saltwater quenching and (2) oil quenching, are used on samples of a particular type of metal alloy. The results are shown in the table below. Assume that hardness is normally distributed. Test whether the variances are statistically different at 90% confidence. (10 pts)

Q2. Two kilograms of air within a piston-cylinder configuration execute a Carnot power cycle between temperatures 750 K and 300 K. The isothermal expansion is associated with a heat input of 60 kJ from the surroundings. The volume after expansion has occurred isothermally is 0.4 m3 . Assuming air behaves as an ideal gas, calculate: (i) thermal efficiency for the cycle (ii) pressure and volume at the beginning of the isothermal expansion, in kPa and m3 , respectively. (iii) the work and heat transfer for each of the four processes, in kJ.

e are choosing material for a round rod. The material must be a metal or alloy. The length of the rod must be close to 1 m, and its cross-sectional diameter must be between 1 mm and 3 mm. Its natural frequency of vibration, f, should be as low as possible. (a) Clearly list the constraints, objective, and free variables. (b) What is the performance index of the material? (c) What are the best 2 material candidates?

e are choosing material for a round rod. The material must be a metal or alloy. The length of the rod must be close to 1 m, and its cross-sectional diameter must be between 1 mm and 3 mm. Its natural frequency of vibration, f, should be as low as possible. (a) Clearly list the constraints, objective, and free variables. (b) What is the performance index of the material? (c) What are the best 2 material candidates?

the whole child approach to childhood development is supported by current brain research

Develop a heat treatment plan for a 0.5 inch diameter part made of H13 tool steel to be heat treated to a RC 50 to 52 and then stress relieved. ( show steps please )

Develop a heat treatment plan foe a 2 inch diameter part made of 4140 to be heat treated to a Rockwell of 48 to 50 Rockwell C on the surface. ( show steps please)

Water flows at a rate of 30 ft3/s from a reservoir with elevation 45 ft to a lower one with elevation 0
ft through a pipe Of length 1800 ft with bends, elbows, entrances and exits contributing a total of
minor losses Of ?K = 2.5. The pipe has a roughness e = 0.0005ft.
-Determine the pipe diameter needed.
-How important are minor losses? 
-Plot the EGL. 

AT mechanics of material,
Can you explain why the contact point between chip( or work) and cutting tool is larger when the cutting speed is slow? I'm very pleased if you explain this to me by using picture or drawing.

You are heating airflow in a long, round tube. The tube is irradiated uniformly, on all sides, with a constant thermal heat flux q". Inside the tube, the air flows with a known heat flux mdot and constant, known properties. The tube has a length L and a diameter D. This is your baseline case. You then add a helical coil inside the tube that stirs up the airflow and doubles the value of h over the baseline case. a) How does the design change impact the temperature of the airflow? b) How does the design change impact the temperature of the tube wall

Explain the significance of the following in a TCP segment:

1) sequence number

2)Acknowledgement number

3) Window

4) SYN Flag

5) FIN Flag

A volume of 8.62 m3 of air in a rigid, insulated container fitted with a paddle wheel is initially at 322 K, 0.4 bar. The air receives 481 kJ by work from the paddle wheel. Assuming the ideal gas model with cv = 0.71 kJ/kg • K, determine for the air the amount of entropy produced, in kJ/K.