The force $F=780i+260j+130k(lb)$ acts where the

cables $AB,AC,$ and $AD$ are joined $($Figure $1).$

Part A

What is the tension in cable $AB?$

Express your answer in pounds to three significant figures.

$T_{AB}=$

Part B

What is the tension in cable $AC?$

$T_{AC}=$

Part C

What is the tension in cable $AD?$