If liquid PMMA is rapidly cooled to room temperature, the structure is ______________.
Fill in the blank(s) with the appropriate word(s).
amorphous
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You are asked to select a polymer for a design where the temperature could vary between 0°C and 100°C, and it is desired that the polymer’s mechanical properties should not significantly change over this temperature range. What type of polymers would you initially investigate for this design, and why would you make this selection?
What will be an ideal response?
General Questions: If you pound a feather with a hammer, which one feels a greater force?
A. always the feather B. always the hammer C. The size of the force is always exactly the same on both of them. D. If the feather moves, then it felt the greater force. Otherwise the force was the same on both.
Impulse: Calculate the impulse due to a force of 4.5 N that lasts for 1.4 s.
A. 6.3 kg? m/s B. 5.0 kg? m/s C. 5.7 kg? m/s D. 6.9 kg? m/s
A wire, 0.60 m in length, is carrying a current of 2.0 A and is placed at a certain angle with respect to the magnetic field of strength 0.30 T
If the wire experiences a force of 0.18 N, what angle does the wire make with respect to the magnetic field? A) 20° B) 25° C) 30° D) 35° E) 60°