At what temperature is the average kinetic energy of an atom in helium gas equal to 6.21 × 10-21 J?
What will be an ideal response?
300. K
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If a specially designed space probe reaches the event horizon of a black hole, an observer watching the clock on this probe from a safe distance would see
A) the clock slow down. B) the clock speed up. C) the clock keep time in sync with the observer's clock. D) the time on the clock would appear to change randomly.
The mass of ice that can be melted by 1 gram of 100°C steam is (Hint: Don't forget about hot water remaining from condensed steam.)
A) 0.125 gram. B) 0.148 gram. C) 6.75 grams. D) 8 grams. E) none of the above
A planet is in orbit around the Sun with a period of 5 years. What is the semimajor axis of its orbit (average distance from the Sun) in AU? Use P2 = a3 to estimate.
A. 1.24 AU B. 8.65 AU C. 123 AU D. 25.0 AU E. 2.92 AU
Areas always have dimensions ____ while volumes always have dimensions ____
a. m2, m3 b. L2, L3 c. Both a and b are correct. d. No answer is correct because of the "always."