About how many stars does a globular cluster have?
A. About a dozen
B. Hundreds
C. Tens to hundreds of thousands
D. Hundreds of millions
E. Billions
Ans: C. Tens to hundreds of thousands
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Natural rubber is made from the polymer _________.
Fill in the blank(s) with the appropriate word(s).
Why didn't a planet form in the region of the solar system now occupied by the asteroid belt?
A. It was too cold for a rocky planet to form beyond Mars. B. Orbital resonances with Jupiter disrupted orbits in this region. C. Gravitational encounters with jovian planets kicked most of this material out into the Oort cloud. D. There was never enough material to form a planet.
We have already launched spacecraft whose orbits will carry into interstellar space
Indicate whether the statement is true or false
How much energy is transported across a 1.00-cm2 area per hour by a sinusoidal electromagnetic wave whose electric field has a maximum strength of 30.4 V/m?
(?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s) A) 0.44 J B) 0.44 mJ C) 0.44 nJ D) 0.44 ?J