Q1. Describe mechanical properties of stress-strain
behavior of a polymer and a plastic (contrast with stress-strain
curves of ceramics and metals)
Q2. Describe variation of elastic/relaxation modulus
with temperature.
Q3. Describe viscoelasticity and examples of a
rubber/elastomer.
Two suppliers manufacture a plastic gear used in a laser
printer. The impact strength of these gears measured in foot-pounds
is an important characteristic. A random sample of 10 gears from
supplier 1 results in x1 = 290 and s1 = 12, and another random
sample of 16 gears from the second supplier results in x2 = 292 and
s2 = 22. Do the data support the claim that the mean impact
strength of gears from supplier 2 is at...
Two suppliers manufacture a plastic gear used in a laser
printer. The impact strength of these gears measured in foot-pounds
is an important characteristic. A random sample of 10 gears from
supplier 1 results in and s1=14 while another random
sample of 16 gears from the second supplier results
in and s2=23. Is there sufficient evidence to
conclude that the variance of impact strength is different for the
two suppliers? Use
Which one?
The variances of impact strength significantly differ at the...
Two suppliers manufacture a plastic gear used in a laser
printer. The impact strength of these gears measured in foot-pounds
is an important characteristic. A random sample of 10 gears from
supplier 1 results in =289.30 and s1=22.5, and another random
sample of 16 gears from the second supplier results in =322.10 and
s2=21. Use only Table II of Appendix A. (a) Is there evidence to
support the claim that supplier 2 provides gears with higher mean
impact strength? Use...
Two types of plastic are suitable for use by an electronic
calculator manufacturer. The breaking strength of the plastic is
important. From random samples of n1 = 10 and n2 = 12 batches the
respective means were obtained as ¯y1. = 152.5 and ¯y2. = 153.7.
The total sum of square for the data was SSTotal = 31.865.
(a) Complete the following ANOVA table.
Source SS df MS F
Treatment
Error -
Total 31.865
(b) Calculate the t statistic for...
Answer in 2 sentences. Describe the structure of a phospholipid and
phospholipid bilayer.
Answer in 2 sentences. How does the organization of membranes
provide for transport and recognition.
15 sentences minimum, no maximum. In this post describe your
(your kids, your parents...) usual sleeping schedule. Describe HOW
it may negatively or positively impact your health. Describe the
improvement that could be implemented. Describe the result of these
improvements.
Thanks so much!
In one or two sentences, describe the usefulness of each of the
following reagents in the analysis of proteins by SDS-PAGE:
(a) polyacrylamide/bis-acrylamide
(b) SDS
(c) reducing agent (dithiothreitol or β-mercaptoethanol)