A stalactite in a cave has drops of waterfalling from it to the cave floor below. The drops are equallyspaced in time and come in rapid succession, so that at any givenmoment there are many drops in midair. (a) Is the center of massof the midair drops higher than, lower than, or equal to the halfway distance between the tip of the stalactite and the cave floor?(b) Choose the best explanation from among the following:I. The drops bunch up as they near the floor of the cave.II. The drops are equally spaced as they fall, since they are released at equal times.III. Though equally spaced in time, the drops are closer togetherhigher up

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Central Force

Central force is the force that acts along the center of mass of one body to the center of mass of another body. Its direction from or away from a point on a body to another is called the center of the force. Such forces include gravitational force between two massive objects or electrostatic forces between two charged particles. So from atoms to planets, the central forces play an important role in shaping our daily lives. One of the remarkable features of central forces is that they are conservative, i.e. the total energy of a central force system can always be expressed as a gradient of a potential energy function.