Which box has a larger upward force (normal force) acting on it? (A) The box of mass 3M
(B) The box of mass M
(C) The two boxes experience equal sized upward normal forces

c

Explanation:

I makes the most sense in math. if you put a 3 in the m box it will be the same. So all they did is take out the 3 in the m box

their crystal patterns have been disrupted by stress

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west