A meteorologist getting ready for a weather report notes that the wet bulb of a psychrometer has a reading of 60°F when the air temperature is 70°F. What would be the resulting reports for (a) the relative humidity and (b) the dew point temperature?
a . 55%
b. 62°F
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The electrical resistivity of pure copper metal at 0°C is 1.6×10-8 ??m. An alloy of 1.12 atom % nickel, which is substitutional in copper, produced with this copper has an electrical resistivity at 0°C of 3×10-8 ??m. What is the electrical resistivity of an alloy produced from this copper with 3.32 atom % nickel at 0°C?
What will be an ideal response?
Interstellar gas clouds may collapse to form stars if they
a. have very high temperatures. b. encounter a shock wave. c. rotate rapidly. d. are located near main sequence spectral type K and M stars. e. all of the above.
Constant Angular Acceleration: A turntable 45 cm in diameter starts from rest and makes its first complete revolution in 3.4 s with constant angular acceleration. If it maintains the same acceleration, how long will it take the turntable to make its second complete revolution?
Fill in the blank(s) with the appropriate word(s).
An organ pipe makes a sound that has a frequency of 450 Hz when the temperature is 20°C. If the temperature is ten degrees colder the wavelength of sound produced in the pipe will
A. get shorter. B. get longer. C. stay the same. D. It is not possible to tell without more information