If a magnet produces a force on a current-carrying wire, the wire
A) produces a force on the magnet.
B) may or may not produce a force on the magnet.
C) none of these
Answer: A
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Determine the approximate value for the convective heat transfer coefficient for water boiling in vertical tubes at a superheat temperature of 120ºC by using Equation 10-56. Compare this result to that using Equation 10-6. Assume the water pressure is 500 kPa.
Thermal Expansion: Two metal spheres are made of the same material and have the same diameter, but one is solid and the other is hollow. If their temperature is increased by the same amount,
A. the solid sphere becomes bigger than the hollow one. B. the hollow sphere becomes bigger than the solid one. C. the two spheres remain of equal size. D. the solid sphere becomes denser and the hollow one less dense. E. the solid sphere becomes less dense and the hollow one denser.
Within Earth's atmosphere the ozone layer is located
A) in the troposphere. B) between the troposphere and the stratosphere. C) in the stratosphere. D) between the stratosphere and the mesosphere. E) in the mesosphere.
One side of a normal outlet is at 120 V AC, the other side is at
A) -120 V AC. B) 0 V. C) 240 V. D) 120 V AC. E) +120 V AC.