Resistors in Combination: The resistors in the circuit shown in the figure each have a resistance of 700 ?. What is the equivalent resistance between points a and b of this combination?
A. 700 ?
B. 2800 ?
C. 175 ?
D. 1400 ?
Answer: A
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Momentum: Find the magnitude and direction of the net momentum of the system shown in the figure. Express the direction by giving the angle the net momentum makes with the +x-axis.
Fill in the blank(s) with the appropriate word(s).
Venus may have started with an ocean's worth of water. Where is its water now?
A) The original water remains vaporized in the atmosphere due to Venus's intense heat. B) Most of the water is frozen beneath the surface. C) Most of the water combined with rocks in chemical reactions. D) The water was lost when ultraviolet light broke apart water molecules and the hydrogen escaped to space. E) The water changed to carbon dioxide through chemical reactions.
Current understanding holds that a galaxy's type (spiral, elliptical, or irregular) ________
A) may either be a result of the mass of the protogalactic cloud that formed it or the result of the heavy element abundance in that cloud B) is always determined by the angular momentum of the protogalactic cloud that formed it C) is determined by whether the galaxy is located in a cluster where collisions are likely or outside a cluster where collisions are less likely D) may either be the result of conditions in the protogalactic cloud that formed it or the result of later interactions with other galaxies
A straight 1.0-m long wire is carrying a current. The wire is placed perpendicular to a magnetic field of strength 0.20 T
If the wire experiences a force of 0.60 N, what is the current in the wire? A) 2.0 A B) 1.0 A C) 3.0 A D) 4.0 A E) 5.0 A