At what distance from a point charge of 14 mC would the electrical potential be 4.2 × 10^4 V? (ke = 8.99 × 10^9 N×m2/C2)
a. 0.76 m
c. 3.0 m
b. 0.58 m
d. 1.7 m
C
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Interstellar gas clouds may collapse to form stars if they
a. have very high temperatures. b. encounter a shock wave. c. rotate rapidly. d. are located near main sequence spectral type K and M stars. e. All of the other choices are correct.
If a beam of blue light has a wavelength of 400 nm is emitted by an object moving away from you at 1% of the speed of light, what wavelength would you see from this light?
A) 396 nm B) 399 nm C) 400 nm D) 401 nm E) 404 nm
A particle (m = 50 g, q = 5.0 ?C) is released from rest when it is 50 cm from a second particle (Q = ?20 ?C). Determine the magnitude of the initial acceleration of the 50-g particle.
A. 54 m/s2 B. 90 m/s2 C. 72 m/s2 D. 65 m/s2 E. 36 m/s2
If the dielectric breakdown field in air is 3 × 10^6 V/m, what potential difference is involved with a 3 cm spark?
a. 1.0 × 10^8 V c. 9 × 10^4 V b. 9 × 10^6 V d. 1.0 × 10^10 V