Fahrenheit and Kelvin scales agree numerically at a reading of:
A. -40
B. 0
C. 273
D. 301
E. 574
Ans: E. 574
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Tensile train is
A) the ratio of the change in length to the original length. B) the stress per unit area. C) the same as force. D) the applied force per cross-sectional area. E) the ratio of stress to elastic modulus.
An ideal heat engine can have an efficiency of 1 if the temperature of the low temperature reservoir is
a. 0 K. b. 0°C. c. 0°F. d. 0°R. e. the same as the temperature of the heat source.
In the Sun, nuclear fusion occurs
A. throughout the entire star. B. only in the core. C. in concentric shells D. in the core and the radiative zone.
Radioactive Decay: Today, uranium contains 0.72% 235U (half-life = 0.70 billion years) and 99.28% 238U (half-life = 4.5 billion years). At a time 1.9 billion years ago, what was the fraction of 235U in uranium?
A. 3.53% B. 4.72% C. 4.90% D. 6.75%