Charge in an Electric Field: An electron is initially moving to the right when it enters a uniform electric field directed upwards, as shown in the figure. Which trajectory (X, Y, Z, or W) will the electron follow in the field?
A. trajectory W
B. trajectory X
C. trajectory Y
D. trajectory Z
Answer: D
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An empty spice bottle has an inner volume of 1.31 × 10^?4 m3 . It has a mass of 112 g when filled with air, and it displaces 1.63 × 10^?4 m3 of water when fully submerged. What fraction of the total volume of the bottle will be beneath the surface when it is placed in a tank of water?
a. 0.69 b. 0.81 c. 0.85 d. 1.00 e. 1.46
We know that giant stars are larger in diameter than the Sun because
a. they are more luminous but have about the same temperature. b. they are less luminous but have about the same temperature. c. they are hotter but have about the same luminosity. d. they are cooler but have about the same luminosity. e. they have a larger absolute magnitude than the Sun.
Betelgeuse is a star in the constellation Orion. It radiates heat at the rate of 3.00 × 1030 W and has a surface temperature of 3000 K
Assuming that it is a perfect emitter, what is the radius of Betelgeuse? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2•K4). A) 7.80 × 1010 m B) 8.70 × 1010 m C) 1.40 × 1011 m D) 1.90 × 1011 m E) 2.30 × 1011 m
Astronomers conclude that quasars must come from the earliest phases of the Universe because they ____
a. have supermassive black holes b. are colliding with other galaxies c. create jets d. have large redshifted spectra e. have a fluctuating luminosity