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Square metal plates having a total exposed area of 10.75 ft.2 are fastened together with rivets having a total exposed area of 15.5 in.2. The environment involves moisture and some salt. Consider two cases:
(1) iron plates with nickel-copper alloy rivets, and
(2) nickel-copper alloy plates with iron rivets.
(a) For each case, which metal will corrode?
(b) How do the rates of corrosion compare for the two cases?
(c) If half as many rivets were used, what influence would this have on the total rate of corrosion?
A US Department of Energy article states that a leak of one drip of hot water per second can cost $1.00 per month. Making reasonable assumptions about drop size and unit cost of energy, determine if this claim is reasonable.
Assuming the average rate of heat dissipation from people in an exercise room is 525 W determine the rate of heat gain of the exercise room from people and the equipment at peak load conditions.
Otherwise, there are no losses at all. Suppose that the outside temperature is freezing and the indoor temperature is kept at 17 °C.
Nitrogen flows through a converging-diverging nozzle designed to operate at a Mach number of 3.0. If it is subjected to an operating pressure ratio of 0.5: Determine the Mach number at the exit. What is the entropy change in the nozzle?
Cylindrical-Spherical System Relationship Assume the position, velocity, and acceleration of a particle are given in a cylindrical coordinate system. Determine the position, velocity, and acceleration of the particle in the spherical system in ter..
In energy equation for a boundary layer the viscous dissipation term is taken as
the surface pressure of venus is about 90 bar and the surface temperature is ap-proximately 880 degrees f. the
a small water droplet of diameter d100 micro meter and temperature tmp 0 deg c falls on a nonwetting metal surface
a mixture that is 15 percent carbon dioxide 5 percent carbon monoxide 10 percent oxygen and 70 percent nitrogen by
water is flowing through a 23 cm diameter pipe with a velocity of 11 ms. the viscosity of water is 8 x 10-3 nmiddotsm2.
air enters an adiabatic turbine at 408ordmc and 1.3 mpa and leaves at 56 kpa. if the isentropic efficiency of the
Suppose interest rates have risen lately and the proportion of executives with retirement investment money in the bond market may have dropped. To test this idea, a researcher randomly samples 210 exec- utives who have retirement funds. Of these, ..
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