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# exam1v1ans - 0001-1 Exam I Physics 1240 Fall 2010 Version...

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0001-1 Exam I – Physics 1240 – Fall 2010 Version 0001 1. Two big boxes are sitting on the floor. One of them weighs 5 Newtons (that's about 1 pound), and has a base which is a square shape, 1 meter by 1 meter. The other is bigger – it weighs 20 Newtons, and has a base which is a square 2 meters by 2 meters. Comparing the two, which one exerts more pressure on the floor, and by how much? A) The larger one exerts 4 times more pressure. B) The larger one exerts twice the pressure. C) The smaller one exerts 4 times more pressure. D) The smaller one exerts twice the pressure. E) They both exert the same pressure . 2. The period of an oscillating object is doubled. What happens to its frequency? A) It quadruples (becomes 4 times larger). B) It doubles (becomes 2 times larger). C) It is unchanged (frequency and period are independent). D) It halves (becomes 2 times smaller). E) It becomes ¼ of what it was (becomes 4 times smaller). 3. Which one of the following best describes the physical nature of sound in air? A) When sound is produced, sound particles are emitted by the source. These sound particles collide many times with air molecules on the way to our ears, where the sound particles are detected. B) When sound is produced, sound particles are emitted by the source. These sound particles travel to our ears in straight lines, without colliding with anything on the way. C) There are no special sound particles. Sound is a traveling pressure disturbance created by the source, and it is this disturbance that propagates through the air to our ears. D) There are no special sound particles. When sound is produced the source emits regular air molecules and those same molecules propagate through the room and arrive at our ears where they are detected. E) Sound is a type of light, technically known as an electromagnetic wave, just very low frequency so that we can hear it. 4. When you turn up the volume on your stereo, how does the motion of the speaker cone change? A) The speaker cone oscillates back and forth more often, completing more cycles per second. B) The speaker cone oscillates back and forth less often, completing fewer cycles per second. C) The speaker cone makes larger oscillations, traveling back and forth farther on each cycle. D)

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## This note was uploaded on 08/24/2010 for the course PHYS 1240 taught by Professor Holland,murray during the Spring '08 term at Colorado.

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exam1v1ans - 0001-1 Exam I Physics 1240 Fall 2010 Version...

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