If an object's acceleration is positive, its speed must be increasing.
Indicate whether the statement is true or false
[Ques. 2] French physicist Hippolyte Fizeau set up an experiment where he sent light through the gaps in the teeth of a rotating gear to a distant mirror, as shown in this figure. He measured the speed of the light when it bounced back from the mirror. If you performed a similar experiment, what value would you get for the speed of light if the distance to the mirror was 50 meters and you estimated that it took light 3 10-7 seconds to travel that distance and return? (See page 349 of your textbook for more on this experiment.)
a. 6.6 108 meters/second.
b. 3.3 108 meters/second.
c. 1.7 108 meters/second.
d. 3.0 108 meters/second.
e. 2.997 108 meters/second.
[Ques. 3] An object moving in a circle undergoes centripetal acceleration.
Indicate whether the statement is true or false
[Ques. 4] What is different about locating images in convex mirrors compared to locating images in concave mirrors?
a. Among many differences, ray diagrams do not work for convex mirrors.
b. Convex mirrors require more rays for a minimum ray diagram.
c. Everything is the same except that the focal point is located behind the mirror.
d. Because convex mirrors have no focal point, rays must be constructed differently.
e. Because convex mirrors have no optic axis, rays must be constructed differently.
[Ques. 5] The slope of a velocity vs. time graph is the acceleration.
Indicate whether the statement is true or false
[Ques. 6] Rays that go through the focal point to a concave mirror return:
a. back on themselves.
b. parallel to the optic axis.
c. perpendicular to the optic axis.
d. at many different angles from the mirror surface.
e. at many different angles relative to the optic axis.
[Ques. 7] The slope of a distance vs. time graph is the acceleration.
Indicate whether the statement is true or false
[Ques. 8] This figure shows that the image of a candle inside the focal point of a concave mirror is virtual, erect, and magnified. Where would the candle's image be if it were placed exactly at the center of curvature, point C?
a. A real inverted image is formed at an infinite distance to the left and infinite in size.
b. A virtual erect image is formed at an infinite distance to the right and infinite in size.
c. The inverted image is formed with the same size as the object, also located at the focal point, but on the opposite size of the optical axis.
[Ques. 9] A body at the end of a spring oscillates up and down ten times in five seconds. The period of oscillation is 2 s.
Indicate whether the statement is true or false
[Ques. 10] One function of concave mirrors is:
a. to focus light.
b. to make light more diffuse.
c. to curve light beams.
d. to serve as wide view mirrors.
e. to scatter light.
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