It's a physical change. the water is changing it's physical state
<span>The magnitude of the rock is equal to g. After the rock is released, there are no more forces acting on it, yet gravity remains. The initial inputs, on a bridge, at an angle of 30 deg below horizontal do not matter after the release.</span>
ANSWER:
The answer will be OT
The phase of the Moon must be new, and the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun.
That will depend on the coefficient of friction between the sliding surfaces, and also on Zak's weight. We don't have any of that information.
