The yield strength of metals is proportional to the negative _________ power of the grain diameter.
Fill in the blank(s) with the appropriate word(s).
1/2
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The basic function of an automobile's carburetor is to atomize the gasoline and mix it with air to promote rapid combustion. Assume that 40 cm3 of gasoline is atomized into N spherical droplets. Each droplet has a radius of 2.0 × 10^-5 m. Find the total surface area of these N spherical droplets
a. 60,000 cm2 c. 20,000 cm2 b. 24,000 cm2 d. 2800 cm2
Three 2.50-?C charges are placed on tiny conducting spheres at the ends of 1.00 m-long strings that are connected at 120° angles as shown below. The magnitude, in N, of the tension in any one of the strings is
?
?
a.
1.88 × 10?2.
b.
3.25 × 10?2.
c.
3.75 × 10?2.
d.
6.50 × 10?2.
e.
7.50 × 10?2.
What is the power of a lens that has a focal length of -40 cm and a width of 2.0 cm?
A) -2.5 diopters B) -0.50 diopters C) +2.5 diopters D) +4.0 diopters E) -50 diopters
The Eiffel tower in Paris is 300 meters tall on a cold day (T = – 5 degrees Celsius). What is its height on a hot day when the temperature is 35 degrees? (It is made of iron which has a coefficient of linear expansion of 0.000012 per degree Celsius.)