What is the magnitude of the electric field 2.8 cm from a tiny object that carries an excess charge of –16 nC? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 180,000 N/C
B) 5100 N/C
C) 1.8 × 1014 N/C
D) -180,000 N/C
E) -5100 N/C
A
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The sound of a band is rated as 50 dB at a distance of 30.0 m. What is the dB sound level of the band when one is 10.0 m from the band?
A. 59.5 dB B. 57.3 dB C. 55.2 dB D. 52.9 dB E. 50.1 dB
Most of the mass of the Milky Way seems to exist in the form of:
A) Population I stars in the disk. B) Population II stars in the Halo. C) hydrogen gas in the disk and spiral arms. D) dark matter out in the Halo. E) the black hole in the Galactic Center.
In the simplified Drake equation, the total number of life-bearing planets in our galaxy is given by
A) NHP B) flife C) NHP × flife D) NHP / flife
In the "space" [or in "outer space"] between Earth and the moon there is
A) air, but no force due to gravity. B) both air and a force due to gravity. C) no air and no force [or pull] due to gravity. D) a big cloud made of chocolate fudge. E) no air, but there is a force due to gravity.