Which jovian planets in our solar system have rings?
A) Saturn only
B) Jupiter and Saturn only
C) all but Neptune
D) all four of the jovian planets have rings.
D) all four of the jovian planets have rings.
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Characteristics of Waves: What is the frequency of a pressure wave of wavelength 2.5 m that is traveling at 1400 m/s?
A. 178 Hz B. 1.78 kHz C. 560 Hz D. 5.6 kHz
The Flash, a comic superhero, is able to run close to the speed of light. Two people, with synchronized watches, stand several kilometers apart and time the Flash as he runs a straight course. The Flash has his own stopwatch and uses it to independently time his run. The Flash also observes the speed at which the finish line moves toward him, and upon finishing his run he calculates the length of the course by multiplying this speed by the time on his stopwatch. Who measures (I) the Flash's proper time for the race, and who measures (II) the rest or proper length for the race?
A. Both the Flash and the two people measure (I) and (II) B. Only the Flash measures both (I) and (II) C. The two people measure (I) and Flash measures (II) D. Neither the Flash nor the two people measure (I) or (II) E. The Flash measures (I) but the two people measure (II)
Lenz's Law: As shown in the figure, two parallel wires carry a current I in opposite directions, and this current is decreasing. A rectangular loop is centered between the wires. The direction of the induced current through the resistor R is
A. from a to b. B. from b to a. C. No current is induced.
Weight and g: In another solar system, a planet has an airless moon Zygo that is 4.0 × 105 m in diameter. Experiments reveal that a freely falling object at the surface of Zygo accelerates at 0.20 m/s2. What is the mass of Zygo? (G = 6.67 × 10-11 N ? m2/kg2)
A. 2.4 × 1019 kg B. 4.8 × 1019 kg C. 1.2 × 1020 kg D. 2.4 × 1020 kg E. 4.8 × 1020 kg