A boy scout will be burned more severely by
A) 100 g of water at 100°C.
B) 100 g of steam at 100°C.
C) both about equally
D) neither of these
Answer: B
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Why do astronomers narrow their search to the "habitable zone" of other star systems?
a. the most likely place to support planets with thick atmospheres b. the least likely place to have zero ultraviolet radiation c. the most likely place with liquid water, and extraterrestrial life d. the most likely place to have oxygen in the atmosphere e. the least likely place to have wide temperature ranges on the surfaces of planets
The stride of a horse would be quicker if more mass in its legs were concentrated
A) in the upper part, nearer the horse's body. B) towards its feet. C) halfway up its legs. D) uniformly all along its legs. E) none of the above
The linear momentum of a 100.0 kg object moving around a 30.0 m circle at a constant speed of 2.20 m/s is
a. 0.0 N b. 220 N c. 242 N d. 6600 N
Two point charges are separated by 10.0 cm and have charges of +1.00 µC and -1.00 µC, respectively. What is the electric field at a point midway between the two charges? (ke = 8.99 × 10^9 N•m2/C2)
a. 14.4 × 10^6 N/C c. 28.8 × 10^6 N/C b. zero d. 7.19 × 10^6 N/C