hello i need help with the following questions please and thank you.

7.) A sign is hung from a ceiling by two cables as shown in the figure below. Attaching the cables at an angle @ above the horizontal creates horizontal stability. In other words, the sign will not sway side-to-side (left-to-right). The smaller 0 is, the more horizontally stable the sign is. However, each cable can only support a tension up to 65% of the sign's weight. What is the smallest angle # that can be used to hang the sign without the cables breaking? A Physics is Fun 8.) The position of a 2.75 x 10"N training helicopter test is given by "(t) = (0.020m/s3)+3i + (2.2m/s)tj - (0.060m/s?)t2k. Find the net force on the helicopter at t = 5.0s