The "Grand Tour" of all four jovians was conducted by:
A) Galileo.
B) Cassini.
C) Pioneer 11.
D) Voyager 1 and 2 both.
E) Voyager 2.
E
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The number of sunspots and their activity peak about every:
A) 36 days. B) six months. C) year. D) eleven years. E) 76 years.
If a transparency sheet is rubbed with tissue and the transparency and the tissue are then held at rest a short distance from each other, the force between them will be
A) a repulsive electric force. B) a repulsive magnetic force. C) an attractive electric force. D) an attractive magnetic force. E) zero.
A cubic box with sides of 20.0 cm contains 2.00 × 1023 molecules of helium with a root-mean-square speed (thermal speed) of 200 m/s. The mass of a helium molecule is 3.40 × 10-27 kg
What is the average pressure exerted by the molecules on the walls of the container? The Boltzmann constant is 1.38 × 10-23 J/K and the ideal gas constant is R = 8.314 J/mol•K = 0.0821 L ? atm/mol ? K. A) 3.39 kPa B) 1.13 kPa C) 570 Pa D) 9.10 Pa E) 2.26 kPa
A conducting bar of length L rotates 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 ? VP?
a.
?12 mV
b.
+8.0 mV
c.
?8.0 mV
d.
+12 mV
e.
?16 mV