In the American Engineering System of units, viscosity can have the units of ("f "/ hr "/12) while in a handbook, viscosity is given in units of (9/cm · s). Convert a viscosity of 20.0 (9/cm· s) to the American Engineering units.

Pick a statement which incorrectly describes steel ? A. It contains carbon atoms in the holes of its iron crystals. B. The presence of carbon-iron bonds in the alloy make steel harder and stronger than pure iron. C. Pure iron is relatively soft and ductile because it lacks directional bonding. O D. The amount of carbon directly affects the properties of steel. O E. All of these are true.

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Aluminum is not as strong as steel. What other factor needs to be considered when comparing the desirability of aluminum versus steel if strength is an important consideration for a design?