What mode of fracture is present for a smooth tensile specimen when a small amount of plastic strain creates a crack that is of sufficient length to cause fracture?
(a) Mode I
(b) Mode II
(c) Mode III
(d) Ductile
(b) Mode II
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In the Copernican system, Earth moves slower along its orbit than the planets that lie farther from the Sun
a. True b. False Indicate whether the statement is true or false
Explain the Babcock model and why the solar cycle should really be considered as a 22-year cycle instead of 11-year cycle
What will be an ideal response?
The axial tilt of Mars has varied from near 0 to 60 degrees.
Answer the following statement true (T) or false (F)
Would you expect polypropylene to be denser or less dense than low-density polyethylene? Why?
A) Polypropylene should be more dense because because it has a greater molecular mass. B) Polyproylene should be more dense because its molecules are able to pack more closely together. C) Polyproylene should be less dense because its molecules are not able to pack together as tightly. D) Polypropylene should be more dense given that the polyethylene is already known to be of low density.