The probability of Earth being hit by a 10 km asteroid in the next few hundred years is
A) impossible to predict
B) very high
C) zero
D) small but not zero
D
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Weight and g: An astronaut drops a marble on the surface of the airless Planet Z-49 and observes that it takes 1.02 s for the marble to fall 2.00 m starting from rest. She also knows that the radius of Z-49 is 3.39 × 106 m. From this information, what will she determine for the mass of Z-49? (G = 6.67 × 10-11 N ? m2/kg2)
A. 3.30 × 1023 kg. B. 6.62 × 1023 kg. C. 4.62 × 1023 kg. D. 8.09 × 1023 kg. E. 9.95 × 1023 kg.
A telescope that is 1.0 meter in diameter has a focal length of 10 meters. An eyepiece with a focal length of 0.01 meters that is used with this telescope would have a magnification of ____________________?
Fill in the blank(s) with correct word
Venus is brightest as seen from Earth:
A) at greatest eastern elongation, appearing half lit in the evening sky. B) at greatest western elongation, appearing half lit in the morning sky. C) 36 days before or after inferior conjunction, appearing as a large crescent. D) at inferior conjunction, when closest to Earth and largest in apparent size. E) at superior conjunction, and fully lit.
A "megawatt" is
A) 1,000,000 watts. B) 1,000,000,000 watts. C) 1000 watts. D) 100 watts. E) None of the above.