Two things that exploit fission are __________ and __________
Fill in the blank(s) with correct word
atomic bombs, nuclear power plants
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The isotope 64Zn has a nuclear radius of 4.8 × 10^-15 m. Approximately what is the nuclear radius of the isotope 125Te?
a. 2.0 × 10^-15 m c. 2.7 × 10^-15 m b. 3.6 × 10^-15 m d. 6.0 × 10^-15 m
A solenoid must be produced that has a magnetic flux density of 25,000 T. The coil for the solenoid has 200 loops in a distance of 1 cm, and the maximum current for the wire is 1A. Select a suitable material for this solenoid from the materials listed. For this design, performance is more important than cost.
What will be an ideal response?
What is the source of luminosity for protostars that have not yet become hot enough for fusion in their cores?
A) light absorbed from nearby stars B) energy released by infalling matter C) fusion in their low-density outer layers D) fission from concentrated radioactive elements
Benzene flowing at 12.5 kg/s is to be cooled continuously from 80°C to 54°C by 10 kg/s of water available at 15.5°C. Using Table 10.6, estimate the surface area required for (a) cross-flow with six tube passes and one shell pass with neither of the fluids mixed and (b) a counterflow exchanger with one shell pass and eight tube passes with the colder fluid inside tubes.
GIVEN
• Benzene coded by water in a heat exchanger
• Benzene flow rate m b= 12.5 kg/s
• Water flow rate m w= 10 mg/s
• Benzene temperatures
? (Tb,in) = 82°C
? (Tb,out) = 54°C
• Water inlet temperature (Tw,in) = 15.5°C
FIND
The surface area required for (a) Cross-flow, 6 tube passes, 1 shell pass, both unmixed (b) Counterflow, 8 tube passes, 1 shell pass, water in tubes
SKETCH
PROPERTIES AND CONSTANTS
the specific heat of water at 20°C (cpw) = 4182 J/(kg K)
the specific heat of Benzene at 68°C (cpb) = 1926 J/(kg K)