Which of the following is not known to result in a high probability of a solvent penetrating a polymer?
(a) Similar solubility parameters for the solvent and polymer
(b) A similar molecular mass for the solvent and polymer molecules
(c) Similar bond types between molecules of the solvent and polymer
(d) Similar molecular structure on the solvent and polymer molecules
(b) A similar molecular mass for the solvent and polymer molecules
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Consider a plot of the displacement (x) as a function of the applied force (F) for an ideal elastic spring. The slope of the curve would be
A) the acceleration due to gravity. B) the spring constant. C) the reciprocal of the acceleration of gravity. D) the mass of the object attached to the spring. E) the reciprocal of the spring constant.
What is the conversion factor between km/ h2 and m/ s2?
A) 7.72 × 10-5 (m/ s2)/(km/ h2 ) B) 2.78 × 10-1 (m/ s2)/(km/ h2 ) C) 1.30 × 104 (m/ s2)/(km/ h2 ) D) 3.60 (m/ s2)/(km/ h2 ) E) 16.7 (m/ s2)/(km/ h2 )
A certain pendulum consists of a 1.5-kg mass swinging at the end of a string (length = 2.0 m). At the lowest point in the swing the tension in the string is equal to 20 N. To what maximum height above this lowest point will the mass rise during its oscillation?
a. 77 cm b. 50 cm c. 63 cm d. 36 cm e. 95 cm
The conservation of energy equation must include
A. Work done on the system B. Thermal energy added to the system C. Thermal energy leaving the system D. Work done by the system. E. All of these are correct.