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
D
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A parallel circuit consists of a 100 V DC power source, a 100 ? resistor, and a variable resistor of resistance R, which varies from 0 to 100 ?. The current in the circuit is
a.
directly proportional to R.
b.
inversely proportional to R.
c.
directly proportional to (100 ? + R).
d.
inversely proportional to (100 ? + R).
e.
neither directly nor inversely proportional to R or to (100 ? + R).
In the Czochralski technique of single-crystal growth, the crystal growth is initiated by epitaxial attachment of atoms to a(n) ___________crystal.
Fill in the blank(s) with the appropriate word(s).
What is the evidence that a meteorite impact caused the great extinction at the end of the Mesozoic?
What will be an ideal response?
The extreme size of volcanoes on Mars indicates that
a. Mars has a much thicker crust than Earth. b. water once flowed in streams on Mars. c. large moving plates have not formed on Mars. d. a and c e. a, b, and c