If a tree's range can migrate 30 km in a century, and warming is expected to cause isotherms to move north- and southward 300 km in a century, what can be expected to occur? Explain. Would Scotch pine (200 km per century) be similarly affected?
What will be an ideal response?
The trees cannot migrate fast enough (at least without human assistance).
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Parallel Wires: An object is hung using a metal spring. If now a current is passed through the spring, what will happen to this system?
A. The spring will contract, raising the weight. B. The spring will extend, lowering the weight. C. The weight will not move. D. The spring will begin to swing like a pendulum. E. None of these are true.
Suppose you see two stars: a blue star and a red star. Which of the following can you conclude about the two stars? Assume that no Doppler shifts are involved. (Hint: Think about the laws of thermal radiation.)
A) The red star is more massive than the blue star. B) The blue star is more massive than the red star. C) The red star is farther away than the blue star. D) The blue star has a hotter surface temperature than the red star. E) The red star has a hotter surface temperature than the blue star.
Which of the following statements about the "helium flash" is correct?
A. It releases enough energy to change the degenerate gas in the core to normal gas. B. It does not occur in high-mass stars. C. It marks the end of the red giant stage for a star like the Sun. D. It does not occur in stars smaller than 0.5 solar masses. E. All of these choices are correct.
What is one atomic mass unit?
a. The mass of a hydrogen atom at the Earth's surface. b. The mass of an oxygen atom in outer space. c. The mass of a carbon atom. d. One-twelfth of a carbon atom. e. One-twentieth the mass of a uranium atom.