The zirconium nucleus contains 40 protons, and an electron is 1.0 nm from the nucleus. What is the electric force on the electron due to the nucleus? ( e = 1.60 × 10-19 C, k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A) 2.9 nN
B) 1000 C
C) 3.7 nN
D) 6.8 nN
E) 9.2 nN
E
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None of the pulsars emit pulses of visible light because
a. pulsars are to hot to emit visible light. b. pulsars contain black holes that won't let visible light escape. c. the gravitational field of a pulsar is so great that the visible light emitted is red shifted. d. pulsars are too far away for the visible light to be bright enough to be detected at Earth. e. A few pulsars do emit visible light pulses.
A flask and a breaker both have the same depth, as shown on the figure. If they are both filled with water, which will have the greater pressure at the bottom?
Will the full moon's rising time for an observer at 40°N on February 1 be the same, earlier, or later than the rising time for an observer at the equator?
The electric field at a point 2.8 cm from a small object points toward the object with a strength of 180,000 N/C. What is the object's charge q? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) -16 nC B) +16 nC C) -17 nC D) +17 nC