onsider a spacecraft in an elliptical orbit around the earth. At the low point, or perigee, of its orbit, it is 450 kmkm above the earth's surface; at the high point, or apogee, it is 4500 kmkm above the earth's surface. a. What is the period of the spacecraft's orbit? b. Using conservation of angular momentum, find the ratio of the spacecraft's speed at perigee to its speed at apogee. c.Using conservation of energy, find the speed at perigee and the speed at apogee. Enter your answers numerically separated by a comma.

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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.