Although we know less about dark matter in elliptical galaxies than in spiral galaxies, what does current evidence suggest?
A) Elliptical galaxies probably contain about the same proportion of their mass in the form of dark matter as do spiral galaxies.
B) Elliptical galaxies probably contain far less dark matter than spiral galaxies.
C) Elliptical galaxies probably contain far more dark matter than spiral galaxies.
D) Unlike the broad distribution of dark matter in spiral galaxies, elliptical galaxies probably contain dark matter only near their centers.
A) Elliptical galaxies probably contain about the same proportion of their mass in the form of dark matter as do spiral galaxies.
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A cubic centimeter of pure water at maximum density has a mass of
a. 1 g. b. 1 kg. c. 1 cg. d. 1 lb. e. none of these
A transformer for charging a power tool steps the line voltage down to 2.9 V. The output current of this transformer is 240 mA. If the transformer is 80% efficient, what is the input current?
A) 300 mA B) 7.3 mA C) 240 mA D) 190 mA E) 4.6 mA
A certain camera uses a double-convex lens made of glass with an index of refraction of 1.60. This lens has a radius of curvature of magnitude 12 cm for the first surface and one of magnitude 24 cm for the second surface
What is the focal length of this lens?
RC Circuits: For the circuit shown in the figure, V = 60 V, C = 20 µF, R = 0.10 M?, and the battery is ideal. Initially the switch S is open and the capacitor is uncharged. The switch is then closed at time t = 0.00 s. What is the charge on the capacitor 8.0 s after closing the switch?
A. 1200 µC B. 940 µC C. 1400 µC D. 1600 µC E. 1900 µC