The magnetic polarities of sunspots _______________ at the end of an 11-year cycle
Fill in the blank(s) with correct word
reverse
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What do asteroids and comets have in common?
A) They have similar densities. B) They have similar orbital radii. C) Most are unchanged since their formation in the solar nebula. D) They have a similar range of orbital inclinations. E) They have nothing in common with each other.
The _____________strength of a brittle or composite material is the maximum tensile stress determined from a three-point bend test.
Fill in the blank(s) with the appropriate word(s).
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.
A startled deer runs 520 m at 20.0° north of east for half a minute, then turns and runs 380 m at 55.0° north of west for 15.0 seconds and stops. What is the average velocity of the deer during this time?
a. 14.3 m/s b. 12.4 m/s c. 20.0 m/s d. 36.1 m/s