A 20.0 kg mass is attached to the end of a 1.00 m steel rod with a 1.00 mm diameter. If the tensile modulus of steel is 
then the frequency of the simple harmonic motion of the mass is
A. 37.2 Hz.
B. 30.4 Hz.
C. 24.5 Hz.
D. 20.1 Hz.
E. 14.1 Hz.
E. 14.1 Hz.
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The critical angle for an air-glass interface is 10.9 degrees. A ray in air is incident on the interface. The reflected ray is 100 percent polarized. The angle of refraction is closest to:
A) 10.7° B) 10.1° C) 9.51° D) 8.91° E) 8.31°
_________is an alloy of zinc and copper
Fill in the blank(s) with the appropriate word(s).
A stable group of stars that formed and are held together by their combined gravity is called a stellar association
Indicate whether the statement is true or false
For small angle approximations
a. the angle must be 10° or less b. the angle must be 10 radians or less c. the angle must be 1° or less d. the angle must be 1 radian or less e. the angle must be 45° or less