A series 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).
d
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Length Contraction: Astronaut Sarah leaves Earth in a spaceship at a speed of 0.280c relative to Earth. Sarah's destination is a star system 12.5 light-years away (one light-year is the distance light travels in one year). According to Sarah, how far did she travel during the trip?
A. 13.0 light-years B. 12.5 light-years C. 12.0 light-years D. 11.5 light-years E. 11.0 light-years
Latent Heats: How much heat must be added to a 8.0-kg block of ice at -8°C to change it to water at 14°C? The specific heat of ice is 2050 J/kg ? C°, the specific heat of water is 4186 J/kg ? C°, the latent heat of fusion of ice is 334,000 J/kg, and 1 cal = 4.186 J.
A. 780 kcal B. 140 kcal C. 180 kcal D. 810 kcal E. 730 kcal
Molecular Bonds: Van der Waals bonding is due to
A. the sharing of electrons between atoms. B. the transfer of electrons between atoms. C. unequal charge distribution around neutral molecules. D. atoms bonding to hydrogen molecules.
A white dwarf cools slowly into a _________________ dwarf
Fill in the blank(s) with correct word