If a guitar string has a fundamental frequency of 500 Hz, which one of the following frequencies can set the string into resonant vibration?
A) 1750 Hz B) 750 Hz C) 1500 Hz D) 250 Hz
C
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As you walk away from a plane mirror on a wall, the height of your image
A) is always the same size. B) is always a real image, no matter how far you are from the mirror. C) gets smaller. D) changes from being a virtual image to a real image as you pass the focal point. E) may or may not get smaller, depending on where the observer is positioned.
A proton initially moves left to right long the x axis at a speed of 9.0 × 10^3 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.8 m before coming to rest. If the proton's mass and charge are 1.67 × 10^?27 kg and 1.60 × 10^?19 C respectively, what is the magnitude of the electric field?
a. 4.3E+1 N/C b. 5.3E–2 N/C c. 5.3E–1 N/C d. 6.6E–1 N/C e. 1.1E+0 N/C
Every cause has an effect and every effect has a cause
a. True b. False Indicate whether the statement is true or false
When is the Sun directly overhead at noon in the continental United States?
a. March 21 b. June 21 c. July 21 d. never