Silicon doped with impurities is used in the manufacture of semiconductor devices.
a. True
b. False
True
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A cylindrical space colony 8.00 km in diameter and 30.0 km long has been proposed as living quarters for future space explorers. Such a habitat would have cities, land, and lakes on the inside surface and air and clouds in the center. All this would be held in place by the rotation of the cylinder about the long axis. How fast would such a cylinder have to rotate to produce a 1-g gravitational
field at the walls of the cylinder? a. 0.049 rad/s b. 0.035 rad/s c. 0.0025 rad/s d. 0.15 rad/s
A small hole is cut in the bottom of a water storage tank. The initial depth of the water is 12.00 m. If the diameter of the small hole in the bottom of the tank is 4.00 mm, then what is the flow rate of the water leaving the tank?
a. 
b. 
c. 
d. 
e. 
The spectral lines of a star will appear ________ if the star is moving away from the Earth.
A. blue shifted (i.e., shifted toward the shorter wavelengths) B. the same (no shift) C. red shifted (i.e., shifted toward the longer wavelengths)
The cabin pressure of a passenger jet cruising at high altitude (30,000 ft) is about 1 atm. and the pressure outside is about 0.3 atm. What is the outward force acting on a door measuring 1 meter by 2 meters? (Hint: convert metric to English units in this problem using the conversion factor m2 to ft2 in the Table of Conversion Factors)