Angles are generally measured counter clockwise from positive x- axis. suppose you have a vector lying in the x-y plane. when you determined its direction using vector method, you got the angle as negative. what does that indicate? both the components of the vector must be negative (lying in the 3rd quadrant). the vector must be lying in the 4th quadrant. 2 at least one of the components of the vector 3 is negative. the vector must be lying in the first quadrant. 4 it is not possible to have a negative angle for a vector. 5 exactly one of the components is negative.

To place a communications satellite into a geosynchronous orbit at an altitude of 22,240 mi above the surface of the earth, the satellite first is released from a space shuttle , which is in a circular orbit at an altitude of 185 mi, and then is propelled by an upper-stage booster to its final altitude. as the satellite passes through a, the booster's motor is fired to insert the satellite into an elliptic transfer orbit. the booster is again fired at b to insert the satellite into a geosynchronous orbit. knowing that the second firing increases the speed of the satellite by 4810ft/s, determine (a.) the speed of the satellite as it approaches b on the elliptic transfer orbit, (b.) the increase in speed resulting from the first firing at a.