Repeat Problem 2–9 for a part made from 2024-T4 aluminum alloy.
(a) Obtain the yield strength and ultimate strength before and after the cold-work operation. Determine the percent increase in each strength.
(b) Determine the ratios of ultimate strength to yield strength before and after the cold-work operation. What does the result indicate about the change of ductility of the part?
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Which of the following is required when hoisting materials with a crane?
a. There can’t be any wind during the lift. b. The material must be wrapped in a tarp. c. There must be a certified rigger present to direct the lift. d. Cranes can be used only for lifts of two or more stories.
Answer the following statement(s) true (T) or false (F)
1. A straight current-carrying conductor has a magnetic field with north and south poles. 2. The accompanying figure shows the symbol for “current in” in the dot-cross method of indicating current direction. 3. The accompanying figure shows the symbol for “current in” in the dot-cross method of indicating current direction. 4. The more current there is through a coil, the weaker the magnetic field will be.
Which grass has the highest shoot density?
A) Kentucky bluegrass B) perennial ryegrass C) ?tall fescue D) creeping bentgrass
Adding humidity to heated air
A) Has no effect on perceived room temperature B) Increases the perceived room temperature C) Reduces the level of carbon particles generated by heat pumps D) Decreases the perceived room temperature