A converging lens will be prescribed by the eye doctor to correct which of the following?
a. glaucoma
c. farsightedness
b. nearsightedness
d. astigmatism
C
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Intensity: An 8.0-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.90 mm in diameter. What is the rms value of the electric field in this laser beam? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s)
A. 2200 N/C B. 1000 N/C C. 1100 N/C D. 4100 N/C E. 2000 N/C
Water waves pass by a piece of cork floating on the water that bobs up and down one complete cycle each second. The waves are 2 meters long. What is the speed of the wave?
A) 0.25 m/s B) 0.50 m/s C) 1.0 m/s D) 2 m/s E) 4 m/s
Why is it easier to travel to a remote viewing site with an 8" Cassegrain than an 8" Newtonian reflector?
What will be an ideal response?
A parachutist of mass 50.0 kg jumps out of an airplane at a height of 800 m. The parachute deploys, and she lands on the ground with a speed of 5.0 m/s. How much energy was lost to air friction during this jump?
a. 49,400 J c. 391,000 J b. 98,700 J d. 489,000 J