Olympus Mons is a
A) shield volcano on Mars.
B) stratovolcano on Mercury.
C) large lava plain on the Moon.
D) shield volcano on Venus.
E) stratovolcano on the Moon.
A
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The three laws of planetary motion by ________ allowed us to predict planetary motion
Fill in the blank(s) with correct word
Spiral density wave theory and self-sustaining star formation are ways to explain why ____
a. stars orbit the galaxy with different periods at different distances from the center b. sun-like stars are evenly distributed through the disk of the galaxy c. dark matter affects the orbit of stars outside the visible disk of the galaxy d. molecular clouds are compressed forming young stars along spiral arms e. the central bulge of the galaxy has a "bar" shape
The length of a certain wire is doubled while its radius is kept constant. What is the change in the resistance of this wire?
A) It stays the same. B) It is doubled. C) It is tripled. D) It is quadrupled. E) It is reduced by a factor of 2.
The pilot of an aircraft flies due north relative to the ground in a wind blowing 40 km/h toward the east. If his speed relative to the ground is 80 km/h, what is the speed of his airplane relative to the air?
a. 89 km/h b. 85 km/h c. 81 km/h d. 76 km/h e. 72 km/h