If Q = 20 ?C and L = 60 cm, what is the magnitude of the electrostatic force on any one of the charges shown?
a.
25 N
b.
19 N
c.
15 N
d.
9.1 N
e.
14 N
d
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The moderate temperatures of islands throughout the world has mainly to do with water's
A) poor conductivity. B) vast supply of thermal energy. C) high specific heat capacity. D) high evaporation rate. E) absorption of solar energy.
A brass wire 2.0 m long and 2.0 mm in diameter supports a 10.0-kg fixture. By what distance did this fixture stretch the wire? Young's modulus for brass is 10 × 1010 N/m2
A) 0.11 mm B) 0.22 mm C) 0.33 mm D) 0.62 mm
The wire in Fig. 29-2 carries a current I that is decreasing with time at a constant rate. The induced emf in each of the loops is such that
A) no emf is induced in any loop. B) all loops experience counterclockwise emf. C) loop A has clockwise emf, loop B has no induced emf, and loop C has counterclockwise emf. D) loop A has counterclockwise emf, loop B has no induced emf, and loop C has clockwise emf. E) loop A has counterclockwise emf, loop B clockwise emf, and loop C has clockwise emf.
The purpose of the moderator in a reactor is to
A. separate the nuclear fuel from the spent products of fission. B. provide cooling for the control rods. C. reduce the number of neutrons available for the chain reaction. D. slow neutrons down so that they will be more likely to initiate fission reactions.