What type of dunes exist on Titan?
A. dust dunes
B. sand dunes
C. ice crystal dunes
D. We have not discovered any dunes on Titan.
Answer: C
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A proposed explanation for gamma-ray bursters is:
A) hypernova-making black holes and bi-polar jets. B) coalescence of a neutron star binary. C) collisions between two white dwarfs. D) Both A and B are possible. E) All three are possible.
A fisherman casts his bait toward the river at an angle of 25° above the horizontal
As the line unravels, he notices that the bait and hook reach a maximum height of What was the initial velocity he launched the bait with? Assume that the line exerts no appreciable drag force on the bait and hook and that air resistance is negligible. A) 18 m/s B) 7.9 m/s C) 7.6 m/s D) 6.3 m/s
A simple electrical circuit has a constant voltage power supply and a variable resistor. As you increase the resistance the current flow _____________
a. increases b. decreases c. remains the same d. cannot be determined
A high-pressure zone girdles Earth at the 30°N and 30°S latitudes, causing
A) great deserts, such as the Sahara and Arabia Desert in Africa, the Mojave Desert in the United States, and the great Victoria Desert in Australia. B) hot, weak winds in the horse latitudes. C) a belt of hot and dry surface air. D) all of these