an iron rod stretches 1mm when a mass of 200 kg is hung from its lower end. What is Young's modulus if the rod is 3m long and 0.4 cm2 in cross section

1.47x10^11

Explanation:

young modulus = stress / strain

stress = force / area = 200x9.8 / 0.00004 = 49000000

strain = extension / length = 0.001 / 3 = 0.0003333

49 million / 0.0003333 = 1.47x10^11

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

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