Consider a magnifying glass with a power of 3.0 D
(a) What is the maximum magnification for a person with a near point of 25. cm?
(b) What is the magnification when viewing with a relaxed eye?
(a) 1.75
(b) 0.75
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A grindstone spinning at the rate of 8.3 rev/s has what approximate angular speed?
a. 3.2 rad/s b. 26 rad/s c. 52 rad/s d. 81 rad/s
What happens to the core of a star if gravity is strong enough to overcome neutron degeneracy pressure?
A) The core contracts and becomes a white dwarf. B) The core contracts and becomes a ball of neutrons. C) The core contracts and becomes a black hole. D) The star explodes violently, leaving nothing behind. E) Gravity is not able to overcome neutron degeneracy pressure.
The dew point is the temperature at which a given humidity equals the saturation density
a. True b. False Indicate whether the statement is true or false
In the figure below the blue object arrow is replaced by one that is much taller than the lens. How many rays from the object will strike the lens?