A thin beam of light enters a thick plastic sheet from air at an angle of 32.0° with the normal and continues in the sheet at an angle of 23.0° with the normal. What is the index of refraction of the plastic?
A) 0.74
B) 1.11
C) 1.28
D) 1.36
D
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For one-dimensional conduction, why are the boundary control volumes half the size of interior control volumes?
GIVEN One-dimensional conduction EXPLAIN (a) Why the boundary control volume is half the size of internal control volumes
A capacitor with a capacitive reactance of 40.0 ? is connected in series with a 100-? resistor across an ac source of frequency 60.0 Hz. What is the phase angle?
A) +68.2° B) -68.2° C) -21.8° D) +21.8° E) 90.0°
A cube at 100°C radiates heat at a rate of 80.0 J/s. If its surface temperature is increased to 200°C, the rate at which it will now radiate is closest to
A) 160 J/s. B) 207 J/s. C) 320 J/s. D) 640 J/s. E) 1280 J/s.
A radar operator on Earth sees two spaceships moving straight at each other, each with speed 0.60c. With what speed does the pilot of one ship see the other ship approaching?
What will be an ideal response?