The risks and expense of manned deep-water exploration must be balanced

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.

Which best describes the difference between internal and thermal energy?

Explain the difference in reactivity of the elements based on their electron configurations.