Which of the following is true of planets?
A) They are self-luminous balls of hot gases.
B) They generate their own energy.
C) They are of identical size.
D) They are nonluminous bodies.
D
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A person has a near point of 40 cm and a far point of 1.0 m. When looking through lenses of focal length –1.0 m, what is the nearest an object can be to be seen clearly?
a. 29 cm b. 67 cm c. 134 cm d. 140 cm e. 68 cm
A 4-?F capacitor has a potential drop of 20 V between its plates. The electric potential energy stored in this capacitor is:
A) 0.8 ?J B) 8 ?J C) 80 ?J D) 800 ?J E) 8000 ?J
A ray of light travels from a glass-to-liquid interface at an angle of 23°. Indices of refraction for the glass and liquid are, respectively, 1.58 and 1.80 . What is the angle of refraction for the ray moving through the liquid?
a. 26.4° b. 20.1° c. 17.5° d. 20.2° e. 26.2°
Predict the boundary layer thickness as a function of the distance from the leading edge for steam at 573 K flowing at 10 m/s over a flat boiler surface.
What will be an ideal response?