A 20-? resistor and a 30-? resistor are wired in parallel and connected to a 9.0-V battery
a. How much current is drawn from the battery?
b. How much power is dissipated in the circuit?
a. 0.75 A
b. 6.8 W
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A charge of 1.0 × 10-6 ?C is located inside a sphere, 1.25 cm from its center. What is the electric flux through the sphere due to this charge? (?0 = 8.85 × 10-12 C2/N ? m2)
A) 0.11 N ? m2/C B) 8.9 N ? m2/C C) 0.028? N ? m2/C D) It cannot be determined without knowing the radius of the sphere.
The Solar and Heliospheric Observatory (SOHO) is positioned:
A) in a geosynchronous orbit around the Earth. B) in near-Earth orbit. C) about 1.5 million kilometers from Earth at the L1 Lagrangian Point. D) on the far side of the Sun at the L3 Langrangian Point. E) on the far side of the Moon.
A 0.50-m long solenoid consists of 1000 turns of copper wire wound with a 4.0-cm radius. When the current in the solenoid is 18 A, the magnetic field at a point 1.0 cm from the central axis of the solenoid is
A. 0.090 mT. B. 0.36 mT. C. 23 mT. D. 36 mT. E. 45 mT.
Molecular Speeds: Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, the average molecular kinetic energy of oxygen molecules, compared to that of hydrogen molecules,
A. is greater. B. is less. C. is the same. D. cannot be determined without knowing the pressure and volume.