The star Polaris is important because it
What will be an ideal response?
always shows the direction of north.
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When Mars is located directly behind Earth with respect to the Sun in its orbit, it is
a. at the midpoint in the sky between east and west at sunset. b. at the midpoint in the sky between east and west at midnight. c. at the midpoint in the sky between east and west at sunrise. d. at the midpoint in the sky between east and west at noon. e. not visible in the night sky.
____________________ discovered Uranus using a telescope that he built himself
Fill in the blank(s) with correct word
Identical balls oscillate with the same period T on Earth. Ball A is attached to an ideal spring and ball B swings back and forth to form a simple pendulum. These systems are now taken to the Moon, where g = 1.6 m/s2, and set into oscillation
Which of the following statements about these systems are true? (There could be more than one correct choice.) A) Both systems will have the same period on the Moon as on Earth. B) On the Moon, ball A will take longer to complete one cycle than ball B. C) On the Moon, ball B will take longer to complete one cycle than ball A. D) On the Moon, ball A will execute more vibrations each minute than ball B. E) On the Moon, ball B will execute more vibrations each minute than ball A.
Some of Earth's artificial satellites orbit in the
a. stratosphere. b. troposphere. c. mesosphere. d. thermosphere. e. exosphere.