Three identical 3.0-µC charges are placed at the vertices of an equilateral triangle that measures 30 cm on a side. What is the magnitude of the electrostatic force on any one of the charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 1.6 N
B) 1.8 N
C) 2.0 N
D) 2.2 N
E) 2.4 N
A
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The assumption of isotropy states that
a. the Universe looks the same at all epochs. b. the Universe looks the same from all locations over sufficiently great distances. c. the Universe looks the same in all directions over sufficiently great distances. d. the Universe looks the same at all epochs, the Universe looks the same from all locations over sufficiently great distances, and the Universe looks the same in all directions over sufficiently great distances. e. None of the other choices are correct.
Intelligence may be subject to convergent evolution because it
A) is inevitable B) is a fundamental characteristic of life C) has survival value D) is required for survival
A 460-turn solenoid of length 30.0 cm and radius 4.00 cm carries a current of 3.50 A. What is the magnetic field strength inside the coil at its midpoint?What is the magnetic field strength inside the coil at its midpoint?
a. 2.02E–3 T b. 6.74E–3 T c. 6.07E–4 T d. 4.95E–5 T
If the speed of an object in circular motion is increased by a factor of 3, its centripetal acceleration for the same radius will be multiplied by a factor of
a. 0.111. b. 0.333. c. 1.73. d. 9. e. 3.