Please help I have 3 questions 1. In three to five complete sentences, explain how a submarine can obtain neutral buoyancy. Remember to use proper grammar and mechanics.

2. Imagine you have a ball tied to the end of a string. You hold the other end of the string and swing it around. Suppose the string breaks, what direction will the ball travel?

3. Centripetal force demonstrates which of Newton's laws of motion?

1:Submerged, the submarine can obtain neutral buoyancy. That means the weight of the submarine equals the amount of water it displaces. The submarine will neither rise nor sink in this state. To make the submarine rise again, compressed air is simply blown into the tanks forcing the seawater out.

2:a straight line that is tangent to its path at the moment the string breaks

3:For objects in uniform circular motion, the net force and subsequent acceleration is directed inwards. Circular motion requires a net inward or "centripetal" force. ... This demonstrates Newton's first law of motion. But if an unbalanced force is applied to the flat board, then the flat board will accelerate.

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explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."