The power factor of an ac RL circuit with a 100-? resistor and a certain inductor is 0.60. What is the impedance of the circuit?
A) 85 ? B) 170 ? C) 340 ? D) 100 ? E) 60 ?
B
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Steel beams each 10 m in length at 25°C are used in a bridge design. The design temperature range is from –20°C to 30°C. The coefficient of linear expansion for the steel is 12.5 × 10–6 °C–1 . Calculate the total change of length possible for the beams in this design.
What will be an ideal response?
One of the most important mechanical properties of metals is their capacity for ______________deformation.
Fill in the blank(s) with the appropriate word(s).
The process in which some substances may remain in a liquid state even though their temperature may dip below the freezing point is known as ________
What will be an ideal response?
The figure above shows the geological time scale of Earth. Life has existed for ________ of the Earth's history.
A) all B) about 90% C) about 50% D) about 25%