Normal atmospheric pressure is
a. 14.7 psi.
b. 1 N/m2.
c. zero.
d. 760 mm of mercury.
e. 101,000 pascals.
f. none of the above.
a, d, e
Physics & Space Science
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Which of these could be considered as "hot dark matter"?
A) deuterium B) weakly interacting magnetic particles (WIMPS) C) neutrinos D) dust close to H II regions E) dark energy
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Calculate the Earth's angular momentum in the approximation that treats the Earth's orbit around the sun as a circle. (MSun = 1.99 × 10^30 kg; T = 3.156 × 10^7 s; ME = 5.98 × 10^24 kg.)
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Wavelengths of light are most efficiently measured in:
a. meters. b. inches. c. millimeters. d. centimeters. e. nanometers.
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