The three point charges +4.0 ?C, -5.0 ?C, and -9.0 ?C are placed on the x-axis at the points x = 0 cm, x = 40 cm, and x = 120 cm, respectively
What is the x component of the electrostatic force on the -9.0 ?C charge due to the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) -0.55 N
B) 0.55 N
C) 0.64 N
D) 0.41 N
E) -0.41 N
D
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Charge of uniform linear density (4.0 nC/m) is distributed along the entire x axis. Determine the magnitude of the electric field on the y axis at y = 2.5 m
a. 36 N/C b. 29 N/C c. 43 N/C d. 50 N/C e. 58 N/C
Why is iron significant to understanding how a supernova occurs?
A) Iron cannot release energy either by fission or fusion. B) Iron is the heaviest of all atomic nuclei, and thus no heavier elements can be made. C) Supernovae often leave behind neutron stars, which are made mostly of iron. D) The fusion of iron into uranium is the reaction that drives a supernova explosion.
What inevitably forces a star like the Sun to evolve away from being a main sequence star?
A) The core begins fusing iron. B) The star uses up all its supply of hydrogen. C) The carbon detonation explodes it as a type I supernova. D) Helium builds up in the core, while the hydrogen burning shell expands. E) The core loses all its neutrinos, so all fusion ceases.
A 20-mF capacitor is attached across a 1000-V power supply. What is the net charge on the capacitor?
a. 20 mC c. 10 mC b. 40 mC d. none of these choices