t1AB_cp_ansspr2010

# t1AB_cp_ansspr2010 - Physics 1112 Spring 2010 University of...

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Physics 1112 Spring 2010 University of Georgia Instructor: HBSch¨uttler Answers to Conceptual Practice Problems PHYS 1112 In-Class Exam #1A+1B Thu. Feb. 4, 2010, 9:30am-10:45am and 11:00am-12:15pm CP 1.01: A student runs westward at 3m/s, away from a vertical plane mirror, while the mirror, mounted on wheels, travels eastward at 7 m/s (with both speeds given relative to the ground). The speed at which the student’s image moves and its direction, relative to the ground, is (A) 4m/s westward (B) 4m/s eastward (C) 10m/s eastward (D) 17m/s eastward (E) 17m/s westward Answer: (D) CP 1.02: Sound waves (including ultrasound) have a speed of wave propagation v Air = 346m/s in air and v Water = 1497m/s in water. Also, note that sin(13 . 364 o ) = 346 / 1497 . A narrow ultrasound beam striking the ﬂat water surface of your swimming pool (A) will have an angle of refraction smaller than the angle of incidence if the beam is incident from above the water surface; (B) will have an angle of refraction greater than the angle of incidence if the beam is incident from below the water surface; (C) cannot undergo total internal reﬂection if incident from above the water surface, regardless of the angle of incidence; (D) will undergo total internal reﬂection if incident from above the water surface with an angle of incidence of 30 o (E) will undergo total internal reﬂection if incident from below the water surface with an angle of incidence of 30 o . Answer: (D) CP 1.03: If a real object is placed between the focal point and the lens for a convergent lens ( f > 0), then the image is (A) virtual, erect and enlarged in height relative to the object (B) virtual, erect and reduced in height relative to the object 1

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Physics 1112 Spring 2010 University of Georgia Instructor: HBSch¨uttler
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t1AB_cp_ansspr2010 - Physics 1112 Spring 2010 University of...

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