Calculate the current through a 10.0-m long 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The resistivity of nichrome is 100 × 10-8 ??m.)
A)
17.5 A
B)
30.9 A
C)
61.8 A
D)
0.388 A
E)
0.776 A
D
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Ideal Gas Law: A sealed container holds 0.020 moles of ideal nitrogen (N2) gas, at a pressure of 1.5 atm and a temperature of 290 K. The atomic mass of nitrogen is 14.0 g/mol. How many molecules of nitrogen are in the container? (R = 8.31 J/mol ? K, 1 atm = 101 kPa)
A. 1.5 × 1021 mol B. 3.0 × 1021 mol C. 6.0 × 1021 mol D. 1.2 × 1022 mol E. 2.4 × 1022 mol
Carbon-14 has a half-life of 5730 y. A sample of wood has been recovered by an archaeologist. The sample is sent to a laboratory, where it is determined that the activity of the sample is 0.144 Bq/g
By comparing this activity with the activity of living organic matter, 0.230 Bq/g, the scientist determines how old the wood sample is, or more precisely, when the tree that the sample came from died. How old is the sample of wood? A) 3870 y B) 4250 y C) 4590 y D) 2630 y E) 2940 y
A chain reaction progresses when the average number of liberated neutrons that cause further fissions is
A) zero. B) less than one. C) one or more. D) none of the above
A refrigerator has a coefficient of performance equal to 4.2. How much work must be done on the operating gas in the refrigerator in order to remove 250 J of heat from the interior compartment?
A) 60 J B) 120 J C) 250 J D) 480 J E) 1050 J