Answer:
the secound one
Step-by-step explanation:
K = 75
75-25=50
Hope this helps!
Answer:
a) 38"
b) L = 5.7'
Step-by-step explanation:
a) Given
P = 9,500 lb/ft
Thick = 18"
We assume an allowable bearing pressure of σ = 3000 lb/sf
If Stress = Force / Area
σ = P/A
Solving for area
A = P/σ ⇒ A = 9,500 lb/ft/3000 lb/sf
⇒ A = 3.167 sf, or 3.167 ft wide, per foot of length.
⇒ A = 38" wide
We can see the pic 1 in order to understand the answer.
b) Given
P = 65,000 pounds = 65,000 lb
Thick = 18" = 1.5'
We assume an allowable bearing pressure of σ = 2000 lb/sf
If Stress = Force / Area
σ = P/A
Solving for area
A = P/σ ⇒ A = 65,000 lb/2000 lb/sf
⇒ A = 32.5 sf
then A = L² ⇒ L = √A = √(32.5 sf) = 5.7 ft
Finally L = 5.7'
We can see the pic 2 in order to understand the answer.
Answer:
2880 in³
Step-by-step explanation:
We can first split this prism into two rectangular prisms. The first one, the bottom portion of the steps, will have dimensions 16 in x 20 in x 6 in; this makes the volume
16(20)(6) = 1920 in³
The top part have a width of 8 inches. This is because the entire width of the bottom is 16; the part from where the top step ends to the other side is 8 inches of it. This leaves 16-8 = 8 inches for the width.
The length will be 20, just as the length of the entire set of steps is.
The height will be 6; this is because the total height of the steps is 12 inches, and the height of only the bottom step is 6; this leaves 12-6 = 6 steps.
This gives us 8 in x 20 in x 6 in, giving us
8(20)(6) = 960 in³
This makes the total volume
1920+960 = 2880 in³
Answer:
<BYX = 74 degrees
Step-by-step explanation:
The sum of angles of the adjacent sides of the trapezoid is 180 degrees
Given
<A = 106 degrees
<A + <BYX = 180
106 + <BYX = 180
<BYX = 180-106
<BYX = 74 degrees