What conditions must be met if a man-made satellite is to attain a circular orbit around the earth? (choose as many as apply)
a) it must be launched with a tangential speed of 0.
b) it must be launched with a tangential speed of 8 km/s.
c) it must be launched with a tangential speed greater than 8 km/s.
d) it must be launched horizontally at a distance over 150 kilometers above the earth.
e) it must be launched vertically with a speed of 8 km/s.