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Occupational safety experts have developed an alternative criterion for electrical safety. They have found that shocks...

Occupational safety experts have developed an alternative criterion for electrical safety. They have found that shocks lasting less than 3 s will be nonlethal if the product of the voltage drop across the body, the current through the body, and the time (≤ 3.0 s) that the current flows does not exceed 13.5 V⋅A⋅s = 13.5 J. Suppose that one hand of a potential victim is grounded and the other hand touches a voltage source; suppose further that his skin resistance is negligible--a worst-case scenario.

Using the criterion above, what is the largest voltage that will not be lethal for a shock that lasts 1.2 s?

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