Amorphous polymers are _____________subject to mixing with solvents than are crystalline polymers.
Fill in the blank(s) with the appropriate word(s).
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When electrons fill a subshell in which the orbitals have equal energy, the order in which the orbitals are filled is such that
a. a minimum number of electrons has unpaired spins. b. a minimum number of electrons has intrinsic angular momentum. c. a maximum number of electrons has unpaired spins. d. a maximum number of electrons first fills the next energy level. e. the maximum number of electrons has the same set of quantum numbers.
The time is 9 pm and the Moon is setting in the west. The Moon phase is third quarter
a. True b. False Indicate whether the statement is true or false
A pipe (E 5 110 GPa) carries a load P1 5 120 kN at A and a uniformly distributed load P2 5 100 kN on the cap plate at B. Initial pipe diameters and thicknesses are dAB 5 38 mm, tAB 5 12 mm, dBC 5 70 mm, and tBC 5 10 mm. Under loads P1 and P2, wall thickness tBC increases by 0.0036 mm. Poisson’s ratio ? for the pipe material is approximately:
(A) 0.27
(B) 0.30
(C) 0.31
(D) 0.34
______________ are cool, with temperatures of about 100 K and densities of ten to a few hundreds of atoms per cubic centimeter
Fill in the blank(s) with correct word