What aspect of Mercury's interior structure is used to explain the presence of its magnetic field?
What will be an ideal response?
its unusually large core
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If the AA designation of an alloy begins with a “7”, the major alloy element is _________.
Fill in the blank(s) with the appropriate word(s).
Hot Jupiters were a surprise to astronomers. What is the current explanation for their existence?
A) Jupiters actually can form close to the host star, since they do not require as much hydrogen compounds and ice as originally thought. B) The temperature of the hot Jupiters is highly uncertain, so they might not be as hot as the astronomers say. C) Jupiters are supposed to form far away from their host star, and then they migrate closer through gravitational interactions with the protoplanetary disk. D) Jupiters form as a companion to the host star, but fail to become actual stars themselves because they are not massive enough.
Two point charges are placed along a horizontal axis with the following values and positions: +3.0 µC at x = 0 cm and -6.0 µC at x = 20 cm. At what point along the x axis is the electric field zero?
a. 8.0 cm c. -38 cm b. -48 cm d. -69 cm
According to a postulate of Einstein, which of the following describes the nature of the laws of physics as one observes processes taking place in various inertial frames of reference?
a. Laws are the same only in inertial frames moving at near speed of light. b. Laws are the same in all inertial frames. c. Laws are the same only in inertial frames with zero velocity. d. Laws are the same only in inertial frames moving at low velocities.