Explain why a heating system made by circulating hot water through a concrete floor could be desirable. Would it be better to circulate the hot water through the ceiling? Why or why not?
What will be an ideal response?
The floor radiates thermal energy, and humans respond positively in terms of
personal comfort to radiant heat.
Floor radiant heating is better than ceiling radiant heating because hot air rises and cold air
sinks.
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Explain how planetary nebulae and white dwarfs are related to mass loss from an aging medium-mass star
What will be an ideal response?
The resolution of Olbers's paradox suggests that it gets dark at night because
a. the Universe is not infinite in age. b. the Universe is static. c. the Universe is closed. d. the Universe is not infinite in age and the Universe is static. e. All of the other choices are correct.
Which statements are true about a VIRTUAL image? (There may be more than one correct choice.)
A) Its location can be calculated, but it cannot be viewed directly by your eye without using auxiliary lenses. B) It cannot be photographed. C) It cannot be viewed on a screen. D) A plane mirror always forms a virtual image. E) A concave lens always forms a virtual image.
A 0.20-kg object attached to the end of a string swings in a vertical circle (radius = 80 cm). At the top of the circle the speed of the object is 4.5 m/s. What is the magnitude of the tension in the string at this position?
a. 7.0 N b. 2.0 N c. 3.1 N d. 5.1 N e. 6.6 N