The body of a swimmer occupies a volume of 2 cubic feet. What is the buoyant force when the swimmer is immersed in water? (The weight density of water is 62.4 pounds per cubic foot.)
124.8 lb
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Imagine that in the distant future you (on earth) are watching a transmission from Pluto, which at the time is 5.0 light-hours from earth. You notice that a clock on the wall behind the person speaking in the video reads 12:10 p.m. You note that your watch reads exactly the same time. Is the station clock synchronized with your watch?
A. Yes, it is. B. No, it isn’t. C. The problem doesn’t give enough information to tell.
A surprise from the Pioneer Venus photos was that:
A) the craters on Venus are all large. B) the clouds rotate around the planet in only four days, very unlike the slow surface rotation. C) the clouds of Venus are mainly water vapor, like our own. D) the highest volcano, Maxwell Mons, protrudes above the cloud deck. E) no impact craters at all are found on the Venusian surface.
What makes the North Star, Polaris, special?
A) It is the brightest star in the sky. B) It is the star straight overhead. C) It appears very near the north celestial pole. D) It is the star directly on your northern horizon. E) It can be used to determine your longitude on Earth.
Why are dark dust clouds largely misnamed?
A) It is ice, not dust, which make them look dark. B) Dust clouds do radiate energy, but not as much light as the stars do. C) The cloud is an illusion, for the dust is evenly distributed around the Galaxy. D) They contain much more gas than dust. E) All of the above are correct.