Tripling the focal length in a telephoto lens, while keeping the aperture size constant, will change the f-number by what factor?
a. 1/9
b. 1/3
c. 3
d. 9
e. 1/6
c
Physics & Space Science
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In a 1-g gravitational field, 1 second after turning on a flashlight its beam will curve beneath a perfectly straight line by
A) less than 4.9 m. B) 4.9 m. C) more than 4.9 m.
Physics & Space Science
Coal, gas, and oil are ______________ fuels
Fill in the blank(s) with correct word
Physics & Space Science
The Large Hadron Collider is expected to produce protons with kinetic energy 7 TeV. What is the speed of these protons?
A) less than 0.9000 c B) 0.9500 c C) 0.9990 c D) greater than 0.9999 c E) 0.9000 c
Physics & Space Science
A 10 kg solid cylinder (I = 1/2 
) with a radius of 30.0 cm is rotating about a vertical axis through its center. If the angular momentum is increasing at the rate of 25 kg 
then what is the torque?
A. 70 N•m B. 45 N•m C. 37 N•m D. 25 N•m E. 12 N•m
Physics & Space Science