The model we have constructed in this chapter neglects feedback effects that might accelerate or brake the warming. Scientists now predict that the Arctic Ocean will be ice-free in the summer by as early as 2020 (due to increased temperatures in the Arctic). Less ice will mean that the Arctic will reflect less visible light back into space. Will this accelerate or brake the warming compared to the predictions of the model in the text?
A. Accelerate
B. Brake
C. No change
A. Accelerate
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The pressure at the bottom of a geyser is
A) less than nearer the top. B) the same as nearer the top C) greater than nearer the top. D) all of the above E) none of the above
Astronomers observe huge bubbles of hot gas, some over a thousand light years across, in the Milky Way. What is their cause?
What will be an ideal response?
A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the string is horizontal, the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?
a. 16 N b. 17 N c. 21 N d. 11 N e. 25 N
Diffraction Gratings: A diffraction grating with 396 lines/mm is illuminated with light of wavelength 343 nm. What is the angular separation between the two second-order bright fringes?
A. 31.5° B. 15.8° C. 32.9°