What is the expected result from the merger of a large irregular and a small irregular galaxy?
What will be an ideal response?
A spiral galaxy is believed to form.
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A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren relative to the police car is 500 Hz, what is the frequency heard by an observer in the truck as the police car approaches the truck? (The speed of sound in air is 343 m/s.)
a. 396 b. 636 c. 361 d. 393 e. 617
Which Mars mission searched for life in the Martian soil in the 1970's?
A) Pathfinder B) Phoenix C) Viking D) Mariner
As a spaceship nears the Moon, its mass
1) varies slightly with distance, 2) increases, 3) decreases, 4) remains unchanged, while the Moon's gravitation force on the ship 5) increases. 6) decreases. 7) remains unchanged.
Slanting Surfaces Without Friction: A 150-N crate is being pulled up a perfectly smooth ramp that slopes upward at 15° by a pull that is directed at 30° above the surface of the ramp. What is the magnitude of the pull required to make the crate move up the ramp at a constant velocity of 1.75 m/s?
Fill in the blank(s) with the appropriate word(s).