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20. Fill in the rest of the chart and predict the number of F-18 nuclei left and the number of
new 0-18 nuclei produced.
Time (hours)
Number of half-lives
F-18 Nuclei (%)
0-18 Nuclei (%)
0.0
Start
100
0
2.0
1
4.0
2
6.0
3
8.0
4
10.0
5
12.0
6
14.0
7
16.0
8
18.0
9
20
10

Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.