Your company has developed a new polymer, and you are asked to determine
(a) its elastic modulus and
(b) its viscosity. To measure these properties, you choose to conduct a stress-relaxation test at 300 K. At 300 K a specimen of the new polymer is strained at t=0 by an amount of 3×10-3, and this requires an initial stress of
6×106 Pa. This strain is constant for 100 hours, and the stress on the polymer has dropped to 3×106 Pa. Assume that this polymer can be modeled as a Maxwell solid, with the viscous component behaving as a Newtonian fluid.
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Multiple-Object Accelerating Systems: A 3.0-kg and a 5.0-kg box rest side-by-side on a perfectly smooth, level floor. A horizontal force of 32 N is applied to the 3.0-kg box pushing it against the 5.0-kg box, and, as a result, both boxes slide along the floor. How hard do the two boxes push against each other?
A. 12 N B. 20 N C. 24 N D. 32 N E. 0 N
To be dimensionally consistent, velocity [L/T], acceleration 
and time [T] must be related as follows.
a. 
b. 
c. 
d. 
One star is emitting primarily visible light, and another star is emitting primarily infrared light. Which star is hotter?
A) There is not enough information to answer the question. B) Both stars are the same temperature. C) The star emitting visible light is hotter. D) The star emitting infrared light is hotter.
The unit for rate of energy transformation, the watt, in an electric circuit is equivalent to which of the following?
a. V/s b. A?? c. V?A d. V/?