Power: An instrument is rated at 250 W if it is connected across a 120-V dc power supply.(a) What current does it draw under normal operation?(b) What is its resistance?(c) How many kilowatt-hours does it use in a day if it is left on all the time?
What will be an ideal response?
(a) 2.1 A (b) 58 ? (c) 6.0 kWh
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A ray of light traveling in air makes a 63.0° angle with respect to the normal of the surface of a liquid. It travels in the liquid at a 39.2° angle with respect to the normal
Find the critical angle for total internal reflection for this interface.
Which of the following planets can be in opposition?
a. Mercury b. Venus c. Earth d. Neptune
If you were to take a voyage across the Milky Way, what kind of material would you spend most of your time in?
A) empty space—a pure vacuum B) dusty molecular clouds C) star clusters D) warm, rarefied clouds of atomic hydrogen E) cool, dense clouds of atomic hydrogen
The greenhouse effect is occurring because
a. the ozone layer is being depleted. b. the amount of carbon dioxide in the atmosphere is increasing. c. the ionosphere reflects low frequency radiation. d. more ultraviolet radiation is penetrating the atmosphere. e. none of the above.