Your motorboat can move at 30 km/h in still water. What is the minimum time it will take you to move 12 km downstream in a river flowing at 6.0 km/h?
A) 20 min
B) 22 min
C) 24 min
D) 30 min
A
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The mean free path of a molecule is 
m in an ideal gas at standard temperature and pressure. What is the mean free path when the pressure of the gas is doubled and the temperature is constant?
A. 
B. 
C. 
D. 
E. 
Iced tea is made by adding ice to 3.0 kg of hot tea, initially at 80°C. How many kg of ice, initially at 0°C, are required to bring the mixture to 10°C? (Lf = 3.33 x 105 J/kg, cw = 4186 J/kg•°C)
a. 2.8 kg c. 1.4 kg b. 1.6 kg d. 2.3 kg
A wire of resistivity ? must be replaced in a circuit by a wire four times as long. If, however, the total resistance is to remain as before, the diameter of the new wire must
A) remain unchanged. B) be two times smaller. C) be four times smaller. D) be two times larger. E) be four times larger.
A car slows down uniformly from a speed of 18.0 m/s to rest in 5.00 s. How far did it travel in that time?
What will be an ideal response?