Two lightbulbs both operate on 120 V. One has a power of 25 W and the other 100 W. Which lightbulb carries more current?
1.The dim 25-W lightbulb does.
2.The bright 100-W lightbulb does.
3.Both are the same.
2
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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.
What are the very cold (about 20 K), dense clouds of gas thought to be the most massive objects in the Galaxy called?
A) emission nebulae B) absorption clouds C) dust clouds D) molecular clouds E) reflection nebulae
What do astronomers mean by a "selection effect". Explain why the detection of giant planets in close orbits does not necessarily mean our Solar System is unusual
What will be an ideal response?
The critical angle for total internal reflection is a:
A. is a single angle for which transmission through the boundary is zero B. a maximum angle of incidence, below which no light is transmitted through the boundary C. minimum angle of incidence, above which no light is transmitted through the boundary D. may be either a minimum or a maximum angle, depending on which of the indices of refraction is larger