<p>An unstretched spring is&#160;<span>13.0</span>&#160;<img src=\"http://sessio

Question

<p>An unstretched spring is&#160;<span>13.0</span>&#160;<img src="http://session.masteringphysics.com/render?units=cm" alt="cm" align="middle" />&#160;long. When you hang an&#160;<span>935</span>&#160;<img src="http://session.masteringphysics.com/render?units=g" alt="g" align="middle" />&#160;weight from it, it stretches to a length of<span>15.0</span>&#160;<img src="http://session.masteringphysics.com/render?units=cm" alt="cm" align="middle" />.&#160;What is the force constant (in&#160;<img src="http://session.masteringphysics.com/render?tex=%7B%5Crm+N%2Fm%7D" alt="{ m N/m}" align="middle" />) of this spring?</p>

Explanation / Answer

Weight hung = 0.935 kg = 0.935*9.8 = 9.163 N

F = k x

k = 9.163 /(15-13) = 4.5815 N/cm = 458.15 N/m

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