Why is the term "arc" used to describe units of measure for angular distance?
a. To avoid confusion with the minutes and seconds of time
b. To describe the arc-shaped distance between the stars
c. To distinguish the base unit of 10 per degree
d. To distinguish the difference between northern and southern spheres
e. To describe the placement of the stars within each hemisphere
a
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A magnifying glass of focal length 150. mm is used to examine an old manuscript
(a) What is the maximum magnification given by the lens? (b) What is the magnification for relaxed eye-viewing (image at infinity)?
Astigmatism is usually due to
A) the cornea or lens being out of round. B) accommodation. C) myopia. D) missing rods. E) hyperopia.
To be able to do work, a system must have _______
Fill in the blank(s) with correct word
In an AC circuit the voltage varies as V = 96. sin (277 t) volts
(a) What is the rms voltage? (b) What is the frequency?