Incorrect the guy wires ab and ac are attached to the top of the transmission tower. the tension in cable ab is 6.8 kn. determine the required tension t in cable ac such that the net effect of the two cables is a downward force at point a. determine the magnitude r of this downward force. assume a = 43 m, b = 48 m, c = 22 m, and d = 29 m.