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February 1, 2015

February 1, 2015

Posted by **ablin** on Tuesday, May 18, 2010 at 9:22am.

calculate the spring constant

what is the size of the force that will produce and extension of 4.0 cm

caluclate the unstretched length of the spring if its total length is 17.5 cm when applied force is 5 N.

- physic -
**drwls**, Tuesday, May 18, 2010 at 11:16amThe spring constant k = Force/extension.

In your case, k = 3.5/0.07 = 50 N/m

Use that k to calculate the force when the extension = 0.04 m. It should be (4/7) times 3.5 = ___ Newtons.

For the final question, calculate the extension when F = 5N,

extension = F/k = 0.1 m = 10 cm

and subtract that from 0.175 m to get the unstretched length.

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