A small glass bead has been charged to 1.9 nC. What is the strength of the electric field 2.0 cm from the center of the bead? (k = 1/4??0 = 8.99 × 109 N ? m2/C2 )
A) 4.3 × 104 N/C
B) 8.5 × 102 N/C
C) 8.1 × 10-5 N/C
D) 8.5 × 10-7 N/C
A
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An observer on Earth's equator would find
a. Polaris directly overhead. b. Polaris 40° above the northern horizon. c. Polaris on the northern horizon. d. the celestial equator passing directly overhead. e. that the ecliptic coincides with the horizon.
Bok globules are small, dark fragments of the interstellar medium
a. True b. False Indicate whether the statement is true or false
Which of the following stars is hottest?
A. G B. F C. M D. O E. B
You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind at constant speed and you perceive the frequency as 1310 Hz
You are relieved that he is in pursuit of a different driver when he continues past you, but now you perceive the frequency as 1240 Hz. What is the frequency of the siren in the police car? The speed of sound in air is 343 m/s. A) 1300 Hz B) 1320 Hz C) 1270 Hz D) 1360 Hz E) 1370 Hz