Unlike welds in steels, welds in aluminum are ________ stronger than the base metal
A) Usually B) Almost never C) Almost always D) None of the above
B
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An ideal gas initially at 300 K and 1 bar undergoes a three-step mechanically reversible cycle in a closed system. Pressure increases isothermally to 5 bar; Pressure increases at constant volume; and, the gas returns adiabatically to its initial state. Take 
= (7/2)R and 
= (5/2)R.
(a) Sketch the cycle on a PV diagram. (b) Determine (where unknown) V, T, and P for states 1, 2, and 3. (c) Calculate Q, W, ?U, and ?H for each step of the cycle.
If the rate is 100%, the percentage and the ____________________ are the same quantity.
Fill in the blank(s) with the appropriate word(s).
When the first European settlers arrived, which of the following was not a check on the population of herbivores?
A) disease B) climate C) predators D) market hunters
Technician Asays automatic transmission fluid is red and easily identified as a leak. Technician B says very old fluid may not appear red and may look like engine oil or power steering fluid. Who is correct?
A. A only B. B only C. both A and B D. neither A nor B