Approximately how long ago did the dinosaurs suddenly become extinct?
A) 6 million years ago
B) 65 million years ago
C) 245 million years ago
D) 10,000 years ago
B
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A cube at 100°C radiates heat at a rate of 80.0 J/s. If its surface temperature is increased to 200°C, the rate at which it will now radiate is closest to
A) 160 J/s. B) 207 J/s. C) 320 J/s. D) 640 J/s. E) 1280 J/s.
What is the probability of rolling either a 7 or 11 on a single roll of a pair of dice?
a. 1/6 b. 2/9 c. 3/8 d. 1/3 e. 1/2
An inventor has created a heat engine that extracts energy from geothermal hotspots and geysers like Old Faithful at Yellowstone National Park. She claims to turn all of the geothermal energy into work. Such a device is
A. a violation of the first law of thermodynamics. B. consistent with Clausius's statement of the second law of thermodynamics. C. a violation of Kelvin's statement of the second law of thermodynamics. D. only possible for a Carnot cycle.
In ___________, the material is forced through an opening in a die into the desired shape.
Fill in the blank(s) with the appropriate word(s).