Answer:I think the answers would be A(maybe),B,and D.
Explanation:
I'm not sure about A. B because it stop people from entering easily. D because people can put cameras on them. I'm most sure about B though. I hoped this helped.
Answer:
Because slave owners didn't want them to know how to read or write because they can use that to escape, an example is they can make a fake letter saying that they are free and is not owned.
Explanation:
Answer:
a > 3 mm
so that critical flow is subject to detection
Explanation:
plane strain fracture toughness = 98.9 MPa root m
yield strength = 860 MPa
flaw detection apparatus = 3.0 mm
Y = 1
solution
we know critical stress formula that is
critical stress
.............................1
here K is design stress plane strain fracture toughness and a is length of surface creak
so here length of surface creak will be
length of surface creak a =
put here value
a =
a = 0.0168 m = 16.8 mm = 0.66 in
so
a > 3 mm
so that critical flow is subject to detection
The answer is D.by a popular reference
They could be separated by mountains or rivers and could be influenced by neighboring peoples.