What isotopes are used as nuclear reactor fuel?
a. uranium-235 b. uranium-238
c. plutonium-239 d. deuterium
a, c
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Amy, Brad, and Cate are walking (or running) along a straight line as shown below
Consider the ratio of the surface area of a cylinder to its volume. Assume the height is equal to its diameter. What happens to this ratio if the diameter of the cylinder decreases by a factor of 2?
A. Remains the same B. Decreases by a factor of 2 C. Increases by a factor of 2 D. Decreases by a factor of 4 E. Increases by a factor of 4
Bottles of perfume sometimes have thick glass (n = 1.5) walls which give the impression the volume is larger than it is. Assume a cylindrical bottle has an inner radius of 1.0 cm and an outer radius of 2.0 cm. How thick (in cm) would the wall appear if you could see a mark on the inside surface?
a. 0.80 b. 0.51 c. 0.72 d. 80 e. 12
Which of the following is not a characteristic of superplasticity?
(a) Grains elongate in the direction of flow. (b) Temperatures are above half of the melting temperature. (c) The material is highly strain-rate sensitive. (d) A strain rate of approximately 10-3 s-1.