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PHYS102Midterm2

# PHYS102Midterm2 - PHYSICS 102 Home Take Midterm Exam II...

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PHYSICS 102 Home Take Midterm Exam II Last Name _______________ First Name______________________ Circle the answer and mark this choice on the scantron. To get a full credit show the all calculations steps in the spaces provided. All the work must be shown in order to receive FULL credit. No excuses will be accepted for delaying your report. 1) The wave speed in an aluminum wire with a radius of 1.00 mm is 120 m/s. What is the tension in the wire? The density of aluminum is 2.70 × 10 3 kg/m 3 . A) 112 N B) 134 N C) 427 N D) 122 N 2) Compared to a sound of 40 decibels, a sound of 50 decibels is 3) When a single charge q is placed on one corner of a square, the electric field at the center of the square is F/q. If three other equal charges are placed on the other corners, the electric field at the center of the square due to these four equal charges is 4) Two charged particles held close to each other are released. As they move, the force on each particle increases. Therefore, the particles must have A) the same sign. B) opposite signs. C) the same mass. D) the same size. E) impossible to answer without additional information 5) A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it approaches a stationary pedestrian. What frequency does the pedestrian hear? The speed of sound in air is 343 m/s.

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6) A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz. After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn? The speed of sound in air is 343 m/s. A) 68 Hz B) 69 Hz C) 70 Hz D) 71 Hz
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