The half-life of 3H is 12 years. About how long does it take for 7/8 of a sample of that radionuclide to decay?
a. 3 years
b. 24 years
c. 4 years
d. 36 years
d
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RC Circuits: A 2.0-?F capacitor that is initially uncharged is charged through a 50-k? resistor. How long does it take for the capacitor to reach 90% of its full charge?
A. 0.90 s B. 0.23 s C. 2.2 s D. 2.3 s
If you run a complete loop around an outdoor track (400 m) in 100 s, your average velocity is
A) 0.25 m/s. B) 4.0 m/s. C) 40,000 m/s. D) zero. E) 4.00 km/s.
Three wires are made of copper having circular cross sections. Wire 1 has a length L and radius r. Wire 2 has a length L and radius 2r. Wire 3 has a length 2L and radius 3r. Which wire has the smallest resistance?
1.wire 1 2.wire 2 3.wire 3 4.All have the same resistance. 5.Not enough information is given to answer the question.
Water at room temperature, 20°C, is pumped into a reactor core where it is converted to steam at 200°C. How much heat (in J) is transferred to each kilogram of water in this process? (csteam = 2 010 J/kg×°C; Lsteam = 2.26 × 10^3 J/g; 1 cal = 4.186 J.)
a. 3.35 × 10^5 b. 7.53 × 10^5 c. 2.67 × 10^6 d. 2.80 × 10^6 e. 3.01 × 10^6