Stretching DNA.
With its double-helix structure, DNA is coiled like a spring. A biophysicist grabs the ends of a DNA strand with optical tweezers and stretches it 26µm producing 1.2pN- tension in the strand.

What's the DNA's spring constant?

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  1. F=kx
    F (tension of the strand)=1.2 pN
    x (displacement)=26 µm

    Solve for k, which is the spring constant. You may need to convert your unit measurements, as your answer's unit will come out in pN/µm instead of the standard N/m.

    (I know this is a little late, but I wanted to post it up, in case anyone else needed it.)

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