Kepler's Laws

Answer the following questions. Mark on the screen. You may change
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#1 A satellite is in an elliptical orbit about a planet as shown. If its speeds at the four labelled points are va, vb, vc, and vd, which of the following is/are true?

#2 A new satellite (m = 2200 kg) is to be used for Earth observation. It is to be in a circular orbit at an altitude of 1.3 x 107 m. What will be its period?

#3 Suppose satellites GP1 and GP2 are both in circular orbits around the Earth. If GP1 has an orbital radius four times that of GP2, what is the period T1 of GP1Ôs orbit compared to the period T2 of GP2?