A particle with a charge of +4.0 ?C has a mass of 5.0 g. What magnitude electric field directed upward will exactly balance the weight of the particle?
A) 4.1 × 104 N/C
B) 8.2 × 104 N/C
C) 4.4 × 104 N/C
D) 1.2 × 104 N/C
E) 5.1 × 104 N/C
D
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Stars are born from the interstellar medium, and aging or dying stars return gas and dust back into the interstellar medium
a. True b. False Indicate whether the statement is true or false
When the Sun is located near one of the horizons, an observer looking at the sky directly overhead will view partially polarized light. This effect is due to which of the following processes?
a. double refraction c. selective absorption b. optical activity d. reflection
What element is oxidized in the following equation and what element is reduced?
SN2 + 2 Ag ? Sn + 2 Ag? A) The tin ion, SN2 , is oxidized, while the silver, Ag, is reduced. B) The tin ion, SN2 , is reduced, while the silver, Ag, is oxidized. C) Both the tin ion, SN2 , and the silver, Ag, are reduced. D) Both the tin ion, SN2 , and the silver, Ag, are oxidized.
When two organ pipes open at both ends sound a perfect fifth, such as two notes with fundamental frequencies at 440 Hz and 660 Hz, both pipes produce overtones. Which choice below correctly describes overtones present in both pipes?
a. 440, 880 and 1 320 Hz. b. 660, 1 320 and 1 980 Hz. c. 880, 1 320 and 1 760 Hz. d. 1 320, 2 640 and 3 960 Hz. e. They have no overtones in common.