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tidal force niru-ye kešandi (#) Fr.: force de marée The → F = d_{tidal}F/dr = (2GMm)/r^{3},
where M is mass of the → primary body,
m is mass of the → secondary body,
r is distance between objects, and G the
→ gravitational constant. The total tidal force experienced
across a body is equal to the tidal force (force per unit distance) multiplied
by the diameter of that body:
F = _{tt}F x 2_{tidal}R (provided that radius
R is much smaller than r). It is obvious that the tidal force experienced
by Earth at Moon's → perigee is larger than
that at the → apogee.
If the tidal force is stronger than a body's cohesiveness, the body
will be disrupted. The minimum distance that a secondary comes to a
primary before it is shattered by tidal force is called its
→ Roche limit. Tidal forces create
→ tidal heating. |