A race car travels 40 m/s around a banked (45° with the horizontal) circular (radius = 0.20 km) track. What is the magnitude of the resultant force on the 80-kg driver of this car?
a. 0.68 kN
b. 0.64 kN
c. 0.72 kN
d. 0.76 kN
e. 0.52 kN
b
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A megaparsec is equivalent to
a. 3.26 light-years. b. 206,265 AU. c. the age of our solar system. d. a million parsecs. e. the diameter of the Milky Way galaxy.
Power: A certain battery charger uses 12 W of power. At 6.0 cents per kilowatt-hour, how much does it cost to charge batteries for a full day?
A. 28¢ B. 1.4¢ C. 75¢ D. 1.7¢ E. 2.3¢
At what temperature would the root-mean-square speed (thermal speed) of oxygen molecules be 13.0 m/s? Assume that oxygen approximates an ideal gas. The mass of one O2 molecule is 5.312 × 10-26 kg. The Boltzmann constant is 1.38 × 10-23 J/K
A) 0.217 K B) 1800 K C) 5410 K D) 0.0666 K
A square is 1.0 m on a side. Point charges of +4.0 ?C are placed in two diagonally opposite corners. In the other two corners are placed charges of +3.0 ?C and -3.0 ?C
What is the potential (relative to infinity) at the midpoint of the square? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) 1.0 × 104 V B) 1.0 × 105 V C) 1.0 × 106 V D) 0 V E) infinite