Gaps in the asteroid belt (often called Kirkwood gaps) are caused by

A) tidal forces from the Sun.
B) tidal forces from Jupiter.
C) the competing gravitational tugs of Mars and Jupiter.
D) orbital resonances with Jupiter.


D

Physics & Space Science

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A light-year is

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An electron moves with a speed of 8.0 × 106 m/s along the +x-axis

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The magnetic field in a region of space is parallel to the surface of a long flat table. Imagine that this page is lying flat on the table. When current is present in the coil, which is lying on the table, the coil tends to rotate so that the left side moves up and the right side moves down. The magnetic field is

A. directed parallel to the page and downwards. B. directed parallel to the page and upwards. C. directed parallel to the page and to the right. D. directed parallel to the page and to the left. E. in a direction that cannot be determined in this experiment

Physics & Space Science