On a Hertzsprung-Russell diagram, where would you find red giant stars?
A) upper right B) lower right C) upper left D) lower left
A
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Compare the graph above to Figure 8.14, which shows the decay of potassium-40. Which element is more radioactive (undergoes radioactive decay more quickly)?
A) uranium-235 B) potassium-40 C) Both are equally radioactive.
A rectangular loop of wire measures 1.0 m by 1.0 cm. If a 7.0-A current flows through the wire, what is the magnitude of the magnetic force on the centermost 1.0-cm segment of the 1.0-m side of the loop? (?0 = 4? × 10-7 T ? m/A)
A) 4.9 × 10-6 N B) 9.8 × 10-8 N C) 9.8 × 10-6 N D) 7.8 × 10-7 N
Carnot Engine: An ideal Carnot engine operating between a warm reservoir of unknown temperature and a cold reservoir at 1.76 K has an efficiency of 11.0%. What is the temperature of the warm reservoir?
A. 1.98 K B. 0.180 K C. 157 K D. 0.160 K
Mercury is heated from 100ºF to vapor at 800ºF. Assume hnfg is 122 Btu/lbm at 676ºF and use a cP of 0.032 Btu/lbm ·ºF for liquid mercury and 0.015 for the vapor. Determine the enthalpy change per unit mass and the heat per unit mass.
What will be an ideal response?