What is true of Jupiter's magnetosphere?
A) Although its surface field is greater, since the planet is larger the total field is actually weaker than Earth's.
B) It does not trap protons and electrons, as Earth's Van Allen belts do.
C) It has a tail that extends at least to Saturn's orbit.
D) It is most extensive on the sunward side of the planet.
E) It is only slightly stronger than Saturn's.
C
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What important change in the Sun over the past four billion years is thought to be very important to understanding the climates of Venus, Earth, and Mars?
A) a gradual weakening of the solar wind with time B) a gradual dimming with time C) a gradual brightening with time D) a gradual reduction in the amount of ultraviolet and X-ray radiation coming from the Sun
What is the simplest way we might detect life on an extrasolar planet?
A) listen for radio signals coming from an advanced civilization on the planet B) wait for aliens from the planet to visit us C) analyze the spectrum of reflected light from the planet D) send an interstellar probe to the planetary system
A coil of wire rotates in the space between the poles of an electromagnet that produces a uniform magnetic field. If the rotation rate is increased, the maximum output voltage
A. increases. B. stays the same. C. decreases.
In a parallel RLC circuit, where IR = IR, max sin(?t), the current through the inductor, IL, is
a. IL = ?IL, max sin(?t). b. IL = IL, max sin(?t). c. IL = ?IL, max cos(?t). d. IL = IL, max cos(?t). e. IL = IL, max tan(?t).