The Elastic Modulus of a Piece of Steel Rod Under

question 79

Short Answer

The elastic modulus of a piece of steel rod under a load of 1200 pounds, is given by the formula , L is the original, unloaded, length in inches, A is the cross-sectional area in square inches, and l is the elongation (in inches) due to a load. A 24 inch long steel rod having a cross-sectional area of A = 2.85 square inches, is stretching 0.009 inches under a load of 1200 pounds. Due to changes in temperature, the elastic modulus E of the rod is changing. Find the rate of change of the elastic modulus if the elongation is currently 0.009 and is changing at a rate of 0.00037 in/s.

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Definitions:

Extinction

In psychology, the gradual decrease and eventual disappearance of a conditioned response when the conditioned stimulus is no longer paired with an unconditioned stimulus.

Rescorla-Wagner Model

A psychological theory describing how new learning can interfere with or enhance existing conditioned associations through a process of expectation.

Associative Strength

The strength of the linkage or association between two elements, such as between a stimulus and a response, in conditioning.

Training Trial

A practice session or experiment aimed at enhancing an individual's skill or knowledge in a specific area.