The 75lb uniform cellar door is held in place by the hinges at a and b and the tension in rope cd. hinge b does not support any axial thrust. find the reaction a1. point d is in the xy plane.

63

Explanation:

75lb uniform cellar door is held in place by the hinges at A and B and the tension in rope CD. Hinge B does not support any axial thrust. Find the reaction A1. Point D is in the XY plane.

A.

Explanation:

When dealing with heavy loads, one needs to take certain precautions in order to avoid or prevent from injuries. So, one should avoid lifting above the shoulder level which can end up pulling your muscle. Also, you can either break the load in parts if possible or get some for lifting heavy bulks. Moreover, one should try to lift with the legs while keeping the back straight and not twisting it. Besides, by increasing magnification you decrease the field of view.

this is true

explanation:

i looked it up