An AC series circuit has 8.00-W resistance, 15.00-W inductive reactance, and 10.00-W capacitive reactance. If an effective (rms) emf of 120 V is applied, what is the effective (rms) current value?
a. 26.0 A
c. 9.23 A
b. 5.31 A
d. 12.7 A
D
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A sound source emits 30.0 W of sound power spread equally in all directions. What is the sound intensity level 30.0 m from the source?
A) 94.2 dB B) 83.2 dB C) 2.65 × 10-3 dB D) 2.65 × 10-3 W E) -25.8 dB
Astronauts are weightless inside the International Space Station because
A) the station and the astronauts are constantly falling toward Earth. B) the station has rockets that fire to counteract Earth's gravity. C) there is no gravity in space. D) the station is too far from Earth for gravity to be noticeable. Answer: A
An electrodeposition process of plating zinc onto steel for corrosion protection is expected to save energy over dipping steel into molten zinc (hot dipping), because it is necessary to keep the hot dip zinc molten continuously; whereas, with electrodeposition it is only necessary to run a current through the electrolyte during the electrodeposition process. The electrodeposition should take no more than 4 minutes to be competitive with hot dipping. With the electrodeposition equipment and agitation of the part and the solution it is found that a current density of 1 A/cm2 gives a coating of zinc that is satisfactory. What thickness and weight of zinc can be electroplated per square centimeter of steel in 4 minutes if the process is 100 % efficient?
What will be an ideal response?
________'s theories were based on the very accurate observations made by ________
A) Kepler; Tycho Brahe B) Galileo; Kepler C) Kepler; Galileo D) Tycho Brahe; Kepler