When a nucleus captures a slow neutron itmust bring the neutron to a stop within

Question

   When a nucleus captures a slow neutron itmust bring the neutron to a stop within the diameter of the nucleusby means of the strong force. Suppose a stray neutron has the speedof 1400 km/s and is barely captured by a nucleus with a diameterd=1.0X10^(-14) m. Assuming that the strong force on theneutron iis approximately constant, find its magnitude. I am very confused about where to begin. It seems likethey are not giving me enough information.    When a nucleus captures a slow neutron itmust bring the neutron to a stop within the diameter of the nucleusby means of the strong force. Suppose a stray neutron has the speedof 1400 km/s and is barely captured by a nucleus with a diameterd=1.0X10^(-14) m. Assuming that the strong force on theneutron iis approximately constant, find its magnitude. I am very confused about where to begin. It seems likethey are not giving me enough information.

Explanation / Answer

We know that          F = mv2/ r            = 1.67 x 10-27 * 1400 * 1400 * 1012 / 0.5 x10-14            ( r = d / 2)            = 6.5465 x 105 N

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