¿En qué lugar de la tubería de vapor podría ubicarse una columna de vapor?
a. Cerca de la caldera
b. En los puntos bajos
c. En los puntos elevados
d. Cerca del serpentín
c. En los puntos elevados
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____ is the measurement of how much work is accomplished in a specific amount of time, with time being the differentiating focus.
a. Power b. Torque c. Work d. Energy
What is the breed of cattle that ranks first in average milk production per cow?
a. Jersey c. Guernsey b. Holstein d. Brown Swiss
The decomposition of nitrogen dioxide 
into nitrogen monoxide 
and oxygen is a second-order reaction. This means that the concentration C of 
at time t is given by 1/C=kt+1/
, where is the initial concentration and k is the rate constant. Assume the initial concentration is known to be 0.03 mol/L exactly. Assume that time can be measured with negligible uncertainty.
a. After 40 s, the concentration C is measured to be 0.0023 ± 2.0 ×10–4mol/L. Estimate the rate constant k, and find the uncertainty in the estimate.
b. After 50 s, the concentration C is measured to be 0.0018 ± 2.0 ×10–4mol/L. Estimate the rate constant k, and find the uncertainty in the estimate.
c. Denote the estimates of the rate constant k in parts (a) and (b) by 
, respectively. The average 
is used as an estimate of k. Find the uncertainty in this estimate.
d. Find the value of c so that the weighted average 
has the smallest uncertainty.
As a typical example of a bar mark number assigned to a reinforcing bar shown on poured-in-place concrete drawings, 4A1 indicates ____.
A. a quantity of 4, bar type A, and length 1, where 1 is matched to the general legend for the drawings B. a number 4 bar, type A, and quantity of 1 for this bar needed in the job C. a number 4 bar, type A, and it is the first length of bar used in the job D. the code for a particular bar type that is specified in the general legend for the drawings