Answer:
48 , 96
Step-by-step explanation:
You are doubling each number
<span>There are 56 possible combinations when drawing two chips. Remember that you cannot draw two of the same chips from the bag, so 11, 22, 33, 44, 55, 66, 77, and 88 are not possible. Therefore, 20 of 56 combinations are divisible by 3, or approximately 36 percent.
12,13,14,15,16,17,18
21,23,24,25,26,27,28
31,32,34,35,36,37,38
41,42,43,45,46,47,48
51,52,53,54,56,57,58
61,62,63,64,65,67,68
71,72,73,74,75,76,78
81,82,83,84,85,86,87</span>
Answer:
b
Step-by-step explanation:
(2x + 6) x (-5x -9)
-10x^2 -18 - 30 -54
-10x^2 - 38 - 54
Assuming P (usually written in upper case) represents a force normal to a given cross section.
If a point load is applied to any point of the section, stress concentration will cause axial stress to vary.
The context of the question considers the uniformity of axial stress at a certain distance away from the point of application (thus stress concentration can be neglected).
If a force P is applied through the centroid, sections will be stressed uniformly. However, if the force P is applied at a distance "e" from the centroid, the equivalent load on the section equals an axial force and a moment Pe. The latter causes bending of the member, causing non-uniform stress.
If we assume A=(uniform) cross sectional area, and I=moment of inertia of the section, then stress varies with the distance y from the centroid equal to
stress=sigma=P/A + My/I
where P=axial force, M=moment = Pe.
Therefore when e>0, the stress varies across the section.
