If the material for life were introduced from space after the Earth formed, a major carrier would have been:
A) the solar wind.
B) tektites from the Moon.
C) comet impacts.
D) encounters with other solar systems.
E) iron meteorites.
C
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Answer the following statement true (T) or false (F)
A wheel (radius = 0.20 m) is mounted on a frictionless, horizontal axis. A light cord wrapped around the wheel supports a 0.50-kg object, as shown in the figure. When released from rest the object falls with a downward acceleration of 5.0 m/s2. What is the rotational inertia of the wheel?
?
?
A. 0.023 kg?m2 B. 0.027 kg?m2 C. 0.016 kg?m2 D. 0.019 kg?m2 E. 0.032 kg?m2
When using an eyepiece of focal length f, the Yerkes refracting telescope gives a magnification of 800 . What focal length eyepiece would yield a magnification of 500?
a. (8/5)2f b. (5/8)f c. (8/5)f d. (5/8)2f
Boat 1 goes directly across a stream a distance L and back taking a time t1 . Boat 2 goes down stream a distance L and back taking a time t2 . If both boats had the same speed relative to the water, which of the following statements is true?
a. t2 > t1 b. t2 < t1 c. t2 = t1 d. t2 = 2t1 e. t2 = 0.5t1