A Steel Rod 55 Cm Long Has a Diameter of 30

question 16

Multiple Choice

A steel rod 55 cm long has a diameter of 30 cm. The compressive strength (the maximum stress it can support without breaking) of this steel is 500 × 10⁶ N/m². What is the compression force that would break the rod?

• A) 3.5 × 10⁷ N
• B) 2.4 × 10⁷ N
• C) 1.4 × 10⁸ N
• D) 4.7 × 10⁸ N
• E) 8.9 × 10⁸ N

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Definitions:

Chi-Square

A statistical test used to determine if a significant relationship exists between two categorical variables in a contingency table.

Degrees of Freedom (df)

Number of values or quantities free to vary when a statistic is used to estimate a parameter.

Expected Frequency

In statistics, the frequency expected in a category of a contingency table under the assumption that the null hypothesis is true.

Chi-Square

A statistical test that measures the difference between observed and expected frequencies in categorical data.