Light bulb A is rated at 60 W and light bulb B is rated at 100 W. Both are designed to operate at 110 V. Which statement is correct?
a. The 60 W bulb has a greater resistance and greater current than the 100 W bulb. b. The 60 W bulb has a greater resistance and smaller current than the 100 W bulb. c. The 60 W bulb has a smaller resistance and smaller current than the 100 W bulb. d. The 60 W bulb has a smaller resistance and greater current than the 100 W bulb. e. We need to know the resistivities of the filaments to answer this question.
B
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Which sequence is correct when ordered by increasing size?
a. Earth, Solar System, Milky Way Galaxy, clusters of galaxies b. Solar System, Earth, galaxy clusters, Milky Way Galaxy c. Earth, Milky Way Galaxy, Solar System, galaxy clusters d. Galaxy clusters, Solar System, Milky Way Galaxy, Earth
Why does the Cepheid distance method fail us beyond about 20 Mpc?
A) The intergalactic dust reddens the Cepheid's light and apparent brightness. B) Distant galaxies are younger than our Milky Way; too young to have Cepheids yet. C) The periods of Cepheids grows longer as the distances increase. D) Distant galaxies are seen in the past, and Cepheids evolve with time. E) Even with the HST, the most luminous Cepheids are too faint to be seen beyond 20 Mpc.
A conducting bar of length L rotates in a counterclockwise direction with a constant angular speed of +2.0 rad/s about a pivot P at one end, as shown. A uniform magnetic field (magnitude = 0.20 T) is directed into the paper. If L = 0.40 m, what is the potential difference, VA ? VB?
a.
+24 mV
b.
?24 mV
c.
+16 mV
d.
?16 mV
e.
+32 mV
A 25-kg wooden sign 3.0-m long by 2.2-m high is supported by two nails along its left edge, one at the bottom of the sign and the other at the top. The nails are on the same vertical line
Find the horizontal component of the force exerted by the upper nail. A) 250 N B) 120 N C) 360 N D) 170 N E) 280 N