At about what fraction of the speed of light do today's spacecraft travel?
A) 1/10 B) 1/100 C) 1/10,000 D) 1/1,000 E) 1/2
C
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Which is the process that explains how life adapts itself to a changing environment?
a. biological evolution b. environmental duplication c. biological transformation d. natural selection e. genetic reproduction
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
___________ have elongated nuclei with spiral structure extending from the ends of the elongations. The Milky Way is a member of this class of galaxy
a. Spiral galaxies b. Barred spiral galaxies c. Elliptical galaxies d. Irregular galaxies e. S0 galaxies
A block slides down a frictionless inclined ramp and experiences no significant air resistance. If the ramp angle is 17
0° above the horizontal and the length of the surface of the ramp is 20m find the speed of the block as it reaches the bottom of the ramp, assuming it started sliding from rest at the top. A) 7.57 m/s B) 19.6 m/s C) 114 m/s D) 10.7 m/s