12. The
piston A
moves vertically between two smooth walls. If the spring has a stiffness of 
. Determine the distribution of the stretch of the spring if
it is subjected to a normally distributed force P ~ N(15,
0.152) lb. The weight of the block is W ~ N(10,
0.12) lb, and P and W
are independent. Assuming the weights of rod and piston are negligible.
Answer
Ans.