A 10.0 kg mass is attached to the end of a 2.00 m long brass rod, which has a diameter of 1.00 mm and negligible mass. The mass at the end is pulled, stretching the rod slightly, and then released. If the elastic modulus of brass is 9.10 × 1010 N/m2, then the period of the resulting oscillations is
A. 0.175 sec.
B. 0.105 sec.
C. 0.133 sec.
D. 0.145 sec.
E. 0.167 sec.
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