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    bayanm's Avatar
    bayanm Posts: 4, Reputation: 1
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    #1

    Jan 6, 2012, 02:08 PM
    Spring Constant
    The left side of the figure shows a light (`massless') spring of length 0.350 m in its relaxed position. It is compressed to 72.0 percent of its relaxed length, and a mass M= 0.210 kg is placed on top and released from rest (shown on the right).

    The mass then travels vertically and it takes 1.50 s for the mass to reach the top of its trajectory. Calculate the spring constant, in N/m. (Use g=9.81 m/s2). Assume that the time required for the spring to reach its full extension is negligible
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Jan 6, 2012, 02:42 PM
    Use energy principles: 1/2 k x^2 = 1/2 m v^2. You'll need to determine the velocity required for the mass to reach the top of its trajectory in 1.5s.
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