What are section lines and what are they used for?
What will be an ideal response?
Section lines are thin lines used in the view of the section to show where the cutting-plane line has cut through material.
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The U-value and R-value of an assembly are related to each other by which relationship?
A) U2 +R2 = 1.0 B) (U)(R) = 1.0 C) U +R = 1 D) U = R E) None of the above
(a) Both cleavage and twinning in iron are favored by increasing the strain rate. Rationalize this statement. (b) Describe the development of a cup?and?cone fracture in a tensile specimen.
What will be an ideal response?
In a chemical reaction run at a certain temperature, the concentration C of a certain reactant at time t is given by 
where 
is the initial concentration and k is the rate constant. Assume the initial concentration is known to be 0.04 mol/L exactly. Assume that time is measured with negligible uncertainty.
a. After 30 s, the concentration C is measured to be 0.0038 ± 2.0 × 
. Estimate the rate constant k, and find the relative uncertainty in the estimate.
b. After 50 s, the concentration C is measured to be 0.0024 ± 2.0 ×. Estimate the rate constant k and find the relative uncertainty in the estimate.
c. Denote the estimates of the rate constant k in parts (a) and (b) by 
respectively. The geometric mean 
is used as an estimate of k. Find the relative uncertainty in this estimate.
The accompanying figure represents the ____ lettering and numerals.
A. digifont B. photofont C. microfont D. minifont