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The elastic limit of brass is 379 MPa. What should be the minimum diameter of a brass rod if it is to support a 400 N load without exceeding its elastic limit?
(1) 1.00 mm
(2) 1.16 mm
(3) 0.90 mm
(4) 1.36 mm
Stress $= \frac{F}{A} = \frac{400 \times 4}{\pi d^2} = 379 \times 10^6 \Rightarrow d = 1.15$ mm
BETA
