Packet 4: Tossup 6

A solid object will be destroyed by this phenomenon as it crosses a distance threshold of 1.26 times radius times the cube root of a ratio of two densities. This phenomenon causes the appearance of namesake “tails” (15[1])in colliding galaxies. This phenomenon, whose strength (15[1])is inversely proportional to (15[1])distance cubed, causes internal friction (-5[1])that heats up Io’s volcanoes. Objects are disintegrated by this (15[1])phenomenon within (15[1])the (*) Roche limit. This phenomenon causes the Moon’s rotational and orbital periods to synchronize in its namesake “locking.” This force is caused by (10[1])gradients in the strength of gravity. For 10 points, what force drives a periodic rising and falling of sea level on Earth? ■END■

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