The sequence from (a) to (d) in this question should be from high thermal conductivity to low thermal conductivity. Which material is out of sequence?
(a) OUHMWPE fibers parallel to the fiber axis
(b) PMMA
(c) HDPE
(d) LDPE
(b) PMMA
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Transformers use ac so there will be the required
A) transfer of energy from coil to coil. B) voltage for transformation. C) change in magnetic field for operation. D) change in input current. E) magnetic field intensities.
The fact that more radioactive particles are spewed from coal-fired power plants than nuclear fission reactors is evidence that
A) coal is more radioactive than uranium. B) coal-fired plants have less shielding. C) coal-fired plants are more numerous. D) all of the above E) none of the above
An object falls freely from a height, H. It is released at t = 0 and strikes the ground at t = T. Consider the time at which the object is at a height of H/2. Also consider the height at which the object is located at the time T/2. Which of the following is true?
1.When the object is at a height H/2, the time is less than T/2 and when the time is T/2, the object is at a height of less than H/2. 2.One cannot tell which of these choices may be true from the given information. 3.When the object is at a height of H/2, the time is equal to T/2. 4.When the object is at a height H/2, the time is greater than T/2 and when the time is T/2, the object is at a height of more than H/2.
If a radioactive isotope with a half-life of 5 hours is injected into your bloodstream for medical imaging purposes, how many hours do you have to wait before the amount of this isotope in your body is 1/16 its original amount?
A) 15 B) 10 C) 25 D) 5 E) 20