The reason why the sky is blue is best explained by
a. the greenhouse effect.
b. Rayleigh scattering.
c. the dew point.
d. auroras.
b
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Air 1000°C flows at an inlet velocity of 2 m/s between two parallel flat plates spaced 1 cm apart. Estimate the distance from the entrance to the point where the boundary layers meet.
GIVEN
Air flows between two parallel flat plates
Air velocity (U?) = 2 m/s
Plate spacing (S) = 1 cm = 0.01 m
FIND
The distance from the entrance (xc) where the boundary layers meet
ASSUMPTIONS
Steady flow
Air is dry and at a temperature of 1000°C
SKETCH
Space-based telescopes carrying long-wavelength infrared detectors must carry coolant such as liquid helium to chill their optics to near absolute zero temperature
a. True b. False Indicate whether the statement is true or false
The power of a lens is 4.0 diopters. What is the focal length of this lens?
A) 25 cm B) 55 cm C) 40 cm D) 20 cm E) 60 cm
A proton moving with a speed of 6.0 × 10^5 m/s perpendicular to a uniform magnetic field of 0.20 T will follow which of the paths described below? (qp = 1.6 × 10^-19 C and mp = 1.67 × 10^-27 kg)
a. a circular path of 1.6-cm radius c. a circular path of 6.3-cm radius b. a circular path of 3.1-cm radius d. a straight line path