A Van de Graaff generator has a spherical dome of radius 12 cm. Operating in dry air, where "atmospheric breakdown" is at Emax = 3.0 × 10^6 N/C, what is the maximum charge that can be held on the dome? (ke = 8.99 × 10^9 N×m2/C2)
a. 4.8 × 10^-6 C
c. 2.7 × 10^-5 C
b. 1.3 × 10^-5 C
d. 3.3 × 10^-6 C
A
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The corona and chromosphere of the Sun are believed to be heated by
a. shock waves rising from below the photosphere. b. the solar wind. c. sunspots. d. magnetic carpets. e. differential rotation.
An unfueled 1000-kg experimental rocket sled at rest on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20 s "burn.". The rocket moves at 160 m/s after the burn. What average force is experienced by the rocket during the burn?
a. 0.80 × 10^4 N b. 0.75 × 10^4 N c. 0.60 × 10^4 N d. 0.35 × 10^4 N
Waves emitted by the Sun and terrestrial wave emissions are
A) the same except for their frequencies and wavelengths. B) entirely different kinds of waves. C) identical.
In the Drude model of electrical conduction, the current density is NOT directly proportional to
a. the average time interval between successive collisions. b. the number of charge carriers per unit volume. c. the square of the electron charge. d. the electric field present in the wire. e. the resistivity of the wire.