the nodal displacements are For the plane strain elements shown in the Figure given as (4, 4) uj = 0.001 in. vị = 0.005 in. U2 = 0.001 in. v2 = 0.0025 in. Uz = 0.0 in. V3 = 0.0 in. 2 (2, 2) (4, 2) Determine the element stresses ox,Gy, T,xy, 01, and 02 and the principal angle 0p. Let E = 30 × 106 psi and v = 0.25, and use unit thickness for plane strain. All coordinates are in inches. (b)

Last person got every single question wrong and didn't include units. Please help.

Please do the last three questions (2, 3 and 4)! Thank you in advance!  A seesaw that weights 45lbs and its 5m long is balanced on the fulcrum in the center.  1- Two children are sitting on opposite sides of each other on the seesaw. One child weights 50lbs and is sitting 0.7m on the left end. Where should the other child sit in order to be balanced on the seesaw if they weigh 42lbs?  2- Now, a third child wants to sit on the seesaw and weighs 30lbs and is sitting 1.25m in front of them and is closer to the fulcrum on the right side. What are the CW and CCW moment of the seesaw now? What is the net moment and direction?  3- Then, a fourth child wants to play on the seesaw and is on the left side of the plank in order to bring the system to equilibrium. How much does the child weigh (Calculate the pounds of force needed in order for rebalance?)  4- Now the fourth child leaves the other three children sitting on the plank. If the three children are sitting in the same potions as they did…

The class I'm taking is physics for scientists and engineers! **** I need help with part  D only*****  Can you please write out the solution and not type out the solution? I had to reask this question because the last tutor typed out the solution and it was very hard for me to follow . Please and thank you for the special request. I have attached the problem. Please view attachment before answering. Thank you!

Need help answering these questions.