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
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
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