A bridge is made with segments of concrete 50 m long. If the linear expansion coefficient is 12 × 10?6 (°C)?1, how much spacing (in cm) is needed to allow for expansion during an extreme temperature change of 150°F?
A. 10
B. 2.5
C. 7.5
D. 5.0
E. 9.5
Answer: D
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If a material is strain-rate sensitive, when the strain rate increases, the applied _________must increase drastically.
Fill in the blank(s) with the appropriate word(s).
A bridge is made with segments of concrete 50 m long. If the linear expansion coefficient is 12 × 10^?6 (°C)?1, how much spacing (in cm) is needed to allow for expansion during an extreme temperature change of 150°F?
a. 10 b. 2.5 c. 7.5 d. 5.0 e. 9.5
One kilogram of chilled water (0°C) is placed in a freezer which is kept at 0°F (-18°C). Approximately how much electric energy (in kilocalories) is needed just to freeze the water if the room temperature is maintained at 75°F (24°C)? (Lice = 333 J/g; cice = 209 J/g×°C.)
a. 11 b. 15 c. 16 d. 13 e. 33
How might you tell whether or not your toothpaste contained either calcium carbonate, CaC 03, or baking soda, NaHC 03, without looking at the ingredients label?
A) if the toothpaste bubbles when heated B) if the toothpaste bubbles when added to ammonia, such as window cleaner C) if the toothpaste produces a salt (NaCl) when added to HCl D) if the toothpaste bubbles when added to vinegar