A concrete cylinder specimen is tested by loading it in compression from its top. The cylinder is restrained from expanding laterally (not allowed to bulge horizontally under the load). A second identical cylinder is tested in compression similarly but without any lateral restraint, i.e., this cylinder is allowed to bulge laterally. Will both cylinders fail at the same or a different value of
load? Explain your answer.
What will be an ideal response?
The first cylinder, restrained from lateral expansion, will fail at a higher load than the second cylinder. The difference between the two loads is a function of the magnitude of lateral restraint - the lateral compressive stress imposed on the cylinder.
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The specification for the pull strength of a wire that connects an integrated circuit to its frame is 10 g or more. In a sample of 85 units made with gold wire, 68 met thespecification, and in a sample of 120 units made with aluminum wire, 105 met the specification. Find a 95% confidence interval for the difference in the proportions of units that meet the specification between units with gold wire and those with aluminum wire.
What will be an ideal response?
Handrails are constructed from _____.
a. plan view drawings b. detail drawings c. pipe drawings d. machine drawings
Cells are classified, according to the nature of their ____ activity, as being primary or secondary.
a. electromotive b. chemical c. physical d. electrical
When making a measurement with a rule the machinist must be careful not to introduce ________ error
A) parallel B) discrimination C) angular D) parallax