How was the surface of Venus mapped?
a) with images taken in optical light by the Keck Telescope inHawaii
b) with a roving vehicle that landed on the surface of Venus
c) with images taken in optical light by the Hubble Space Telescope
d) with radar bounced off of it by the Magellan spacecraft
e) it is impossible to map the surface of Venus by any method because it has no surface
Ans: d) with radar bounced off of it by the Magellan spacecraft
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Calorimetry: A lab assistant drops a 400.0-g piece of metal at 100.0°C into a 100.0-g aluminum cup containing 500.0 g of water at 15.0°C. In a few minutes, she measures the final temperature of the system to be 40.0°C. What is the specific heat of the 400.0-g piece of metal, assuming that no significant heat is exchanged with the surroundings? The specific heat of this aluminum is 900.0 J/kg ? K and that of water is 4186 J/kg ? K.
A. 1900 J/kg ? K B. 2270 J/kg ? K C. 3300 J/kg ? K D. 3800 J/kg ? K E. 4280 J/kg ? K
A sonic boom is produced by an airplane flying at a speed
A) just below the speed of sound. B) equal to the speed of sound. C) greater than the speed of sound. D) all of the above E) none of the above
The average energy dissipated in an inductor is
A) zero. B) proportional to the inductance. C) proportional to both the inductance and frequency. D) proportional to the frequency. E) none of the above.
A scientific model is considered valid if it is consistent with
A) a single observation by an individual scientist B) the opinions of experts in the field C) repeated observations made by an individual scientist D) independent observations made by different scientists