• Card 23 / 36: A cylindrical body of length body of length 5 cm and diameter 1 cm is subject to a tension force of 1000 N. The cylinder extends by 3 mm in length. If the body behaves elastically, which of the following represents Youngs modulus for that material?
    A) 212 MPa
    B) 848 MPa
    C) 848 kPa
    D) 212 KPa
    E) 424 kPa

    Answer:
    A) 212 MPa

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Explanation:

First calculate the force per cross sectional area by dividing 1000 N by the area of the cylinder; this is the stress. The calculate the strain from 0.3 cm/5 cm = 0.06. Young's modulus can be found by dividing the stress by the strain. Be careful with units. You may wish to review section 2.2.

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Mechanics I ME102

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Attribution:  Stephanie Redfern, Ranjeet (Ron) Agarwala, and Dr. Steve Gibbs. Mechanics I. The Saylor Academy 2014, http://www.saylor.org/courses/me102/
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