Explain why is euler theory good mathematically but not equally good mechanically. Give one example to prove your point.

project about automotive cruise control system

AEROSPACE ENGINEERING QUESTION

1) Calculate the synodic period of Venus with respect to Earth.

I'm not sure exactly how to do this. Our professor hasn't given us a formula or anything. Can someone please give me a hand. Thank You.

EDIT: I FIGURED IT OUT. :)

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.