A stretched string is observed to vibrate in three equal segments when driven by a 480 Hz oscillator. What is the fundamental frequency of vibration for this string?
a. 480 Hz
b. 320 Hz
c. 160 Hz
d. 640 Hz
e. 240 Hz
C
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The estimated age of the Milky Way Galaxy is about ________.
A. 4.6 billion years B. 13 billion years C. 100,000 years D. 20 billion years
General Questions: A fireman is sliding down a fire pole. As he speeds up, he tightens his grip on the pole, thus increasing the vertical frictional force that the pole exerts on the fireman. When the force on his hands equals his weight, what happens to the fireman?
A. The fireman comes to a stop. B. The fireman descends with slower and slower speed. C. The fireman descends with a smaller but non-zero acceleration. D. The fireman continues to descend, but with constant speed. E. The acceleration of the fireman is now upward.
Kinetic energy is proportional to mass
Indicate whether the statement is true or false
Through what potential difference must an electron (starting from rest) be accelerated if it is to reach a speed of 3.0 × 10^7 m/s?
a. 5.8 kV b. 2.6 kV c. 7.1 kV d. 8.6 kV e. 5.1 kV