Mastering Physics Solution Tutorial, 'The position of a 49 g oscillating mass is given by x(t)

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Mastering Physics Video Solution Tutorial, "The position of a 49 g oscillating mass is given by x(t)=(2.1cm)cos12t, where t is in seconds. Determine the amplitude. Determine the period. Determine the spring constant. Determine the maximum speed. Determine the total energy. Determine the velocity at t = 0.45 s"

In this problem we review how to calculate energy in simple harmonic motion, amplitude, period, and how to calculate the spring constant.

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I am struggling with the last part of this question... when I rework the last portion I do not get the same number as in the video.

leliashankula
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why is the spring constant 7.1 N/m. When I punch it into any calculator I get 0.073 N/m. What am I doing wrong?

melmartin