The fact that a dew drop is spherical is best described in terms of
A) gravitation.
B) gauge pressure.
C) surface tension.
D) Archimedes' principle.
E) viscosity.
C
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Carnot Engine: A heat engine having the maximum possible efficiency has an efficiency of 25% when operating between two heat reservoirs. If the temperature of the cold reservoir is 300 K, what is the temperature of the hot reservoir?
A. 350 K B. 375 K C. 400 K D. 450 K E. 500 K
In a thundercloud there may be an electric charge of +30 C near the top of the cloud and ?30 C near the bottom of the cloud. These charges are separated by about 4.00 km. What is the electric force between these two sets of charges? (ke = 8.99 × 10^9 N·m2/C2)
a. 5.1E+11 N b. 1.3E+20 N c. 5.1E+5 N d. 2.0E+9 N e. 3.2E+13 N
The mercury in a thermometer has a volume of 0.516 milliliters and a mass of 2.8 grams. What is its density?
A. 4.52 g/mL B. 5.43 g/mL C. 6.72 g/mL D. 7.31 g/mL
Relative to the size of the planet, Mercury has the largest core of any planet
Indicate whether the statement is true or false