A person weighing 900 N is standing on snowshoes. Each snowshoe has area 2500 cm2 and has negligible weight. What pressure does this person's weight exert on the snow?
A) 0.18 N/m2
B) 0.36 N/m2
C) 1800 N/m2
D) 3600 N/m2
C
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Radiation pressure: If the average intensity of the sunlight in Miami, Florida, is 1060 W/m2, what is the average magnitude of the force this light exerts on a 16-m2 surface of black asphalt that totally absorbs the light? (c = 3.00 × 108 m/s)
A. 7.83 × 10-5 N B. 1.63 × 10-5 N/m2 C. 2.61 × 10-5 N D. 5.65 × 10-5 N E. 0.204 × 10-5 N
In the context of blackbody radiation, which of the following statements is true of stars?
A) Temperatures of stars cannot be estimated from their color. B) Red stars are cool, and blue stars are hot. C) Red stars are hot, and blue stars are cool. D) Star temperatures cannot be measured using the relative strengths of various spectral lines.
What characteristic of sound determines the "pitch" of a musical note?
A) amplitude B) wavelength C) frequency D) phase E) intensity
A diffraction grating with 10 rulings is illuminated by a light source. When do other wavelengths begin to distinguish themselves from 500 nm in the second order?
1.at 475 nm and 525 nm 2.at 450 nm and 550 nm 3.at 495 nm and 505 nm 4.at 487.5 nm and 512.5 nm