We recorded this initial reading and labeled it as our L 1 Than we measured the

# We recorded this initial reading and labeled it as

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screw so that the bubble level would be accurate. We recorded this initial reading and labeled it as our L 1 . Than we measured the diameter of the wire (D) using the micrometer and we measured the length of the wire (L). Afterwards we added 7 kg to the weight pan, one at a time. After we added each 1 kg weight, we adjusted the micrometer to the bubble would be back in the center and recorded the reading of the micrometer screw (L 2 ). Finally, we took off all seven weights one by one and moved the bubble and recorded the number. It was the same as the previous step, but in reverse. Results (Data and Calculation): L 1 = 7.42 mm L = 680 mm D = .00052 mm A = 2.12 x 10 -7 m 2
Table 1 Weight m (kg) Applied Force F = mg (N) L 2 (mm) ΔL = L 2 – L 1 Strain ΔL/L Stress F/A (N/m 2 ) 1 9.80 7.61 .19 2.79 x 10 -4 4.62 x 10 7 2 19.4 7.73 .31 4.56 x 10 -4 9.15 x 10 7 3 29.4 7.82 .40 5.88 x 10 -4 1.39 x 10 8 4 39.2 7.94 .52 7.65 x 10 -4 1.85 x 10 8 5 49.0 8.06 .64 9.41 x 10 -4 2.31 x 10 8 6 58.8 8.11 .69 1.01 x 10 -3 2.77 x 10 8 7 68.6 8.29 .87 1.28 x 10 -3 3.24 x 10 8 The slope of graph one is 3x10 11 2.00E-04 4.00E-04 6.00E-04 8.00E-04 1.00E-03 1.20E-03 1.40E-03 0.00E+00 5.00E+07 1.00E+08 1.50E+08 2.00E+08 2.50E+08 3.00E+08 3.50E+08 f(x) = 287470297981.77x - 33622073.57 Stress vs Strain Graph 1 Strain Stress (N/m2)
Table 2 Weight m (kg) Applied Force F = mg (N) L 2 (mm) ΔL = L 2 – L 1 Strain ΔL/L Stress F/A (N/m 2 ) 7 68.6 8.29 .87 1.28 x 10 -3 3.24 x 10 8 6 58.8 8.16 .74 1.09 x 10 -3 2.77 x 10 8 5 49.0 8.03 .61 8.97 x 10 -4 2.31 x 10 8 4 39.2 7.93 .51 7.50 x 10 -4 1.85 x 10 8 3 29.4 7.85 .43 6.32 x 10 -4 1.39 x 10 8 2 19.4 7.73 .31 4.56 x 10 -4 9.15 x 10 7 1 9.80 7.62 .20 2.94 x 10 -4 4.62 x 10 7 The slope of graph two is 3x10 11 2.00E-04 4.00E-04 6.00E-04 8.00E-04 1.00E-03 1.20E-03 1.40E-03 0.00E+00 5.00E+07 1.00E+08 1.50E+08 2.00E+08

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• Spring '17
• HalinaOprychal
• Physics