In order to lift a bucket of concrete, you must pull up harder on the bucket than it pulls down on you
A) True
B) False
B
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You drive 6.00 km at 50.0 km/h and then another 6.00 km at 90.0 km/h. Your average speed over the 12.0 km drive will be
A) greater than 70.0 km/h. B) equal to 70.0 km/h. C) less than 70.0 km/h. D) exactly 38.0 km/h. E) cannot be determined from the information given, must also know directions traveled
Various new quantities are introduced in this chapter, each having associated units. Which of the following quantities is followed by the wrong SI unit for that quantity?
1.resistivity, ?·m 2.temperature coefficient of resistivity, (°C)-1 3.electric power, kWh 4.drift speed, m/s
According to author Norman Mailer from his book Of a Fire on the Moon, quoted in the opening section,
A) powerful new science-based technologies are bringing about a better life on this planet. B) the creation of Earth was a beautiful and spiritually significant event for the human race. C) intelligent extraterrestrial life forms probably exist in many places, and may visit Earth in the near future. D) the establishment of a technology base on the moon is a crucial step in the exploration of the solar system. E) science is moving us rapidly along new paths, but we haven't stopped to consider where those paths might lead.
According to the HST data, very distant (and early) galaxies tend to be
A) smaller, bluer, and more irregular than modern ones. B) redder, due to the recession of the universe. C) larger and bluer that modern galaxies. D) nothing but quasars. E) very well formed into clusters of nothing but spirals.