PROBLEM 3.50 A hole is punched at A in a plastic sheet by applying a 600-N force P to end D of lever CD, which is rigidly attached to the solid cylindrical shaft BC. Design specifications require that the displacement of D should not exceed 15 mm from the time the punch first touches the plastic sheet to the time it actually penetrates it. Determine the required diameter of shaft BC if the shaft is made of a steel with and
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Express the following as an algebraic expression: three times the square of X reduced by the cube root of Y.
What will be an ideal response?
Chemical costs associated with a packed-bed flue gas incinerator for odor control have been decreasing uniformly for 5 years because of increases in efficiency. If the cost in year 1 was $100,000 and it decreased by $5,000 per year through year 5, the present worth of the costs at 10% per year is closest to:
(a) $344,771 (b) $402,200 (c) $515,400 (d) $590,700
Which of the following statements is correct about flushing A/C systems?
A. Most A/C system manufacturers recommend flushing B. A/C system flushing effectively cleans very small refrigerant passages C. Flushing chemicals make refrigerant cool better D. Flushing solvents may remain in A/C systems, causing problems
Pressure is normally measured in _____
A) foot-pounds B) pounds per square inch C) pounds of force D) inch-pounds