Answer the following statement(s) true (T) or false (F)
1. The layer of air closest to the earth’s surface is called the troposphere and plays an important role in shaping our weather.
2. The higher the air temperature, the less water vapor the air can hold before it is fully saturated.
3. Surface water refers to water in reservoirs, lakes, rivers, and streams.
4. Groundwater refers to water that has collected on the ground.
5. Water is a common engineering material.
1. True
2. False
3. True
4. False
5. True
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Which of the following are not public good issues related to agriculture?
a. Farmers' decisions to sell farmland for development. b. A Forest Service decision to allow cattle to graze on public lands. c. A farmer's decision to drain a pothole on his/her land. d. a and c above. e. None of the above.
Cracks that occur in the heat-affected zone (HAZ) at the grain boundaries are called _____
a. magnesium cracks b. liquation cracks c. ductile cracks d. solidification cracks
What is the resistance of a system that is powered by 480 volts and has 60 amps flowing through it?
A. 5.8 ohms B. 10 ohms C. 13.5 ohms D. 8 ohms
Consider the east wall of a house that has a thickness of L. The outer surface of the wall exchanges heat by both convection and radiation. The interior of the house is maintained at T?1, while the ambient air temperature outside remains at T?2. The sky, the ground, and the surfaces of the surrounding structures at this location can be modeled as a surface at an effective temperature of Tsky for radiation exchange on the outer surface. The radiation exchange between the inner surface of the wall and the surfaces of the walls, floor, and ceiling it faces is negligible. The convection heat transfer coefficients on the inner and outer surfaces of the wall are h1 and h2, respectively. The thermal conductivity of the wall material is k and the emissivity of the outer surface is ?2.
Assuming the heat transfer through the wall to be steady and one-dimensional, express the mathematical formulation (the differential equation and the boundary and initial conditions) of this heat conduction problem. Do not solve.
