(6%) Problem 13: Crates A and B have equal mass. Crate A is at rest on an incline that makes and angle of 0 = 39 degrees to horizontal, while crate B is at rest on a horizontal surface. Tran , Theresa - ttran55@mail.sfsu.edu @theexpertta.com - tracking id: 6C65-7E-A041-B9BD-31983. In accordance with Expert TA's Terms of Service. copying this information to any solutions sharing website is strictly forbidden. Doing so may result in termination of your Expert TA Account. D ' 33% Part (a) Write an expression for the ratio of the normal forces, A to B, in terms of 0, _ Grade Summary NA/NB _ || Deductions 0% cos(a) 005(4)) Submissions Attempts remaining: g (g per attempt) sin(a) sin() '5 Y detailed view d g m n Hints: 0% deduction per hint. Hints remaining: i Feedback: 1% deduction per feedback. i ' 33% Part (b) What is the ratio of the normal forces, A to B? i ' 33% Part (c) In which case is the normal force greater