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

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