Atmospheric refraction makes the daylight hours
A) longer.
B) shorter.
C) neither
Answer: A
Physics & Space Science
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Radiation: The cylindrical filament in a light bulb has a diameter of 0.050 mm, an emissivity of 1.0, and a temperature of 3000°C. How long should the filament be in order to radiate 60 W of power? (? = 5.67 × 10-8 W/m2 ? K4)
A. 11 cm B. 9.4 cm C. 8.6 cm D. 7.2 cm E. 5.9 cm
Physics & Space Science
A pair of 10-N vectors at right angles to each other has a resultant of about
A) 10 N. B) 14 N. C) 20 N. D) none of the above
Physics & Space Science
What is the element X for the nuclide 64 30X?
A. Zn B. Se C. Gd D. Ge
Physics & Space Science
If the potential is given by 6/ x2, the x-component of the electric field is
A) -12 x-3. B) -6x. C) 12 x-3. D) 12x. E) 6x.
Physics & Space Science