Question

What would be the effect on satellites now in orbit if the earth stopped rotating

Answer 1

There would be no effect on the satellites themselves, but satellites that were former synchronous (always above the same place on earth) would not stay at the same place in the sky, as seen from the ground. This would disrupt satellite TV and some communicate systems on earth.

There would be even more serious problems on earth below, as the length of a day suddenly became one year. Winters would be very cold indeed.