On April 8, 2005, observers off New Zealand observe an annular eclipse at sunrise, and those in Columbia see an annular eclipse at sunset
Yet in the middle of the path, off the Galapagos Islands, cruise ships are advertising that they will show their guests a total solar eclipse. How can this be possible?
The Earth's radius is about 6,000 km (4,000 miles), so this means that at noon, when the Sun is highest overhead, the cruise ship passengers will be just close enough to the Moon to see it big enough to cover the Sun, if only for a few seconds.
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Where did the cosmic microwave background (CMB) come from?
a. Photons emitted from the first stars b. Photons released from hydrogen in our galaxy c. Light scattered by dust in our Solar System d. Photons released when electrons and nuclei combined for the first time.
Suppose that a symmetry argument of some kind tells us that the electric field in a certain region points in the +y direction and has a magnitude that depends only on y. For which of the following gaussian surfaces would it be easiest to calculate the net flux of the electric field?
A. A cubical surface oriented so that two opposite faces are perpendicular to the y axis. B. A spherical surface. C. A cylindrical can-like surface oriented with its central axis perpendicular to the y axis. D. A cylindrical can-like surface oriented with its central axis parallel to the y axis. E. A cone-like surface oriented with its central axis parallel to the y axis.
Suppose Earth were to cool down a little. How would the carbon dioxide cycle tend to restore temperatures to normal?
A) Cooler temperatures cause volcanoes to become more active, so they release more carbon dioxide into the atmosphere than they do when temperatures are warmer. B) Cooler temperatures allow carbon dioxide to form rain and rain out of the atmosphere. C) Cooler temperatures mean more ice and more erosion, which somehow makes the planet warm up. D) Cooler temperatures lead to slower formation of carbonate minerals in the ocean, so carbon dioxide released by volcanism builds up in the atmosphere and strengthens the greenhouse effect.
As the filament of a lamp is heated it changes
A) temperature. B) color. C) both of these D) neither of these