Two possible overhead valve combustion chambers are being considered, the first has two valves and the second design has four valves per cylinder. The diameter of the inlet valve is 23 mm for the first design and 18.5 mm for the second design. If the second design is adopted, show that the total valve perimeter is increased by 60.8 per cent. If the valve lift is restricted to the same fraction of valve diameter, calculate the increase in flow area. What are the additional benefits in using four valves per cylinder?

The spiral of Archimedes is a curve described in polar coordinates by the equation ?? = ???? where ?? is the distance of a point from the origin, and ?? is the angle of the point in radians with respect to the positive x-axis. Write an m-file to create a plot of the spiral of Archimedes using 1000 points for 0 ? ?? ? 6?? ?????? when k = 0.5. Be sure to include a title, axis labels, and grid on the plot. Hint: use the command axis equal.

what is the slip plane for the lomer Cottrell barrier formed by combining the (a/2)[-110] on (111) with the (a/2)[101] on (1-1-1)

explain the differences between E and S glasses

13.0 (20 pts)    An electroplating process will be used to coat the exterior surface of a 160 mm diameter x 1.5 meter long cylinder with silver. Determine the time in minutes to electroplate silver to a thickness of 0.06 mm if the plating current is 15 amps.

A W8 3 31 rolled-steel shape is used for a column of 21-ft effective
length. Using allowable stress design, determine the allowable
centric load if the yield strength of the grade of steel used is
(a) sigma Y = 36 ksi
(b) sigma Y = 50 ksi.

Use E = 29 * 10 ^6 Psi

Using the Faraday equation. What current and time are needed to plate a 1 mm thick layer of copper onto an object with a surface area of 0.1m2 ? The density of copper is 8940 kg/m3 , its atomic weight is M = 63.5 kg/kmol and copper ions have a valence of z = 2.

two large aluminum plates (k =240W/m.K) each 1cm thick with 10micrometer surface roughness are placed in contact under a pressure of 1bar in air (k=0.026W/m.K). The temperature at the inside and outside surfaces is 400 degrees Celsius and 150degrees Celsius. Calculate the heat Flux and the temperature drop due to contact resistance.

What are the synthesis methods for carbon nanotubes? What is the general growth mechanism for CNTs? List at least 2 potential applications for CNTs. What are the synthesis methods for silicon nanowires? List at least 2 potential applications for SiNWs.

In a heat treatment of a specific excavator bucket tooth of 15kg mass, the tooth is heated to 885⁰C and to achieve the required level of physical properties it needs to be cooled to the final temperature in a cooling tank using brine as the cooling medium. Determine the final temperature if the minimum required mass of brine initially at 20⁰C temperature is 260 kg, using specific heat values c_b= 3.71 J/g·K and c_s=0.47 J/g·K for brine and steel respectively. Assume no heat losses to the environment.

Advantages, disadvantages and typical applications for the Acoustic Emission Testing.

what is the impact that the technology did?

the technology is the auto focus cameras on the phone or cameras which is a mechatronics system

(can you type it please it is hard to read the handwriting )

Fluid enters a tube with a flow rate of 0.021 kg/s and an inlet temperature of 20°C. The tube, which has a length of 6.280 m and diameter of 15 mm, has a surface temperature of 30°C. Determine the heat transfer rate to the fluid if it is water. The heat transfer rate to the fluid, in W is?