Electric fields are vector quantities whose magnitudes are measured in units of volts/meter (V/m). Find the resultant electric field when there are two fields, E1 and E2, where E1 is directed vertically upward and has magnitude 96 V/m and E2 is directed 48° to the left of E1 and has magnitude 165 V/m.

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(a) Find the speed of a satellite moving around the earth in a circular orbit that has a radius equal to six times the earth's radius of 6.38 106 m.
(b) Find the satellite's orbital period.
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