The greater the velocity the fluid flows through an orifice, the __________ the differential pressure that develops across it.

A. less
B. greater


Answer: B

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If a pure inductance is connected to an ac source, the current lags the applied voltage by ____________________ electrical degrees.

Fill in the blank(s) with the appropriate word(s).

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Information that provides a reliable and valid reflection of the real world is said to be

a. accurate. b. complete. c. differentiated. d. systematic. e. dependable.

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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.


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Microcontrollers use data registers to contain information about conditions associated with peripheral operation

Indicate whether the statement is true or false

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