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**Question:**

A distance

*R*is measured to be 3.400 ± 0.007m. What is the absolute uncertainty in

*R^*−2?

**Attempted solution:**

Relative uncertainty: 2* (0.007/3.4) = 4.11E-3;

R^-2 = 3.4^-2 = 0.0865 m^-2;

Absolute uncertainty = R^-2 * relative = 0.0865 * 4.11E-3 = 3E-4 m^-2;

Any help would be greatly appreciated!!

EDIT: instead of 3E-4, the correct rounding should be 4E-4.

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