A reflected ray of light leaves a plane mirror's surface at an angle of 30° relative to the normal. The angle of incidence was
a. 30° relative to the surface.
b. 60° relative to the normal.
c. 90° from the surface.
d. none of these.
d
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The total mass of galaxies in a cluster of galaxies divided by the number of galaxies in the cluster can be used to determine a typical galaxy's ___________
a. luminosity b. distance c. mass d. diameter e. age
Does the uncertainty principle affect our ability to follow the path of a baseball? Why or why not?
A) no, because the uncertainties in the position and momentum of the baseball are so small in comparison to its size and total momentum that they are unnoticeable B) yes, because we cannot know both where the baseball is and which way it is going at the same time C) no, because the exclusion principle says that large objects are excluded from the consequences of the uncertainty principle D) no, because the uncertainty principle applies only to electrons
A lenticular galaxy is another name for an elongated elliptical galaxy
Indicate whether the statement is true or false
Fred swings around a 0.40 kg ball attached to a string at constant speed in an almost horizontal circle of radius 1.3 meters. If one revolution takes 1.4 s:
(a) What is the angular speed of the ball? (b) What centripetal force is exerted on the ball?