The rms current is equal to the direct current that:
a. produces the same average voltage across a resistor as in an AC circuit.
b. dissipates an equal amount of energy in a resistor at the same rate as in an AC circuit.
c. provides the same average current in a resistor as in an AC circuit.
d. results in the same peak power in a resistor as in an AC circuit.
b
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Some scientists speculate that super-Earths and water worlds might be habitable at greater distances from their stars than Earth-size planets. Why?
A) Their larger sizes might allow them to retain hydrogen atmospheres. B) Their larger sizes mean they might have more of the ingredients needed for life. C) For the water worlds, at least, they are certain to have oceans no matter how far they are from a star. D) These planets may retain more internal heat than Earth, which might drive greater geological activity.
Suppose you live at latitude 30°S. Which star is circumpolar in your sky?
Consider the following data for four stars: Star RA Dec. Spica 13hr24m.1 -11°20' Deneb 20hr39m.7 +45°06' Sirius 6hr44m.2 -16°42' Alpha Centauri 14hr38m.4 -60°46' A) Alpha Centauri B) Deneb C) Spica D) Sirius
An electron and a positron (antielectron), both nearly at rest, collide. What particle(s) is(are) produced?
a. One photon of energy 1.02 MeV b. Two photons of energy 511 keV c. A pi-meson d. A K-meson and an anti-neutrino
Four identical particles (mass of each = 0.24 kg) are placed at the vertices of a rectangle (2.0 m × 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the moment of inertia of this rigid body about an axis that passes through the center of mass of the body and is parallel to the shorter sides of the rectangle?
a. 2.4 kg/m2 b. 2.2 kg/m2 c. 1.9 kg/m2 d. 2.7 kg/m2 e. 8.6 kg/m2