Standing Waves on a String: Find the first three harmonics of a string of linear mass density 2.00 g/m and length 0.600 m when the tension in it is 50.0 N.
A. 132 Hz, 264 Hz, 395 Hz
B. 66 Hz, 132 Hz, 198 Hz
C. 264 Hz, 528 Hz, 792 Hz
D. None of these
Answer: A
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A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.0 rad/sec2 acquires an angular velocity of 5.0 rad/sec. The CD continues rotating at 5.0 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the centripetal acceleration of a point 4.0 cm from the center at the time 10.0 seconds from the start?
A. 2.0 
B. 1.8
C. 1.0
D. 0.9
E. 0.6
As the velocity of an inertial frame of reference increases with respect to a stationary observer, Einstein's theory of special relativity predicts that the length of an object, measured in the dimension parallel to the motion of the reference frame
, will A) decrease. B) remain unchanged. C) increase. D) increase at first but start to decrease when the speed of the reference frame equals half the speed of light. E) decrease at first but start to increase when the speed of the reference frame equals half the speed of light.
Relate Seyferts to spirals
What will be an ideal response?
The index of refraction of a type of glass is 1.50, and the index of refraction of water is 1.33. If light enters water from this glass, the angle of refraction will be
A) greater than the angle of incidence. B) equal to the angle of incidence. C) less than the angle of incidence.