If a 110 ft steel measuring tape with a cross section of 0.008 in² is stretched with a force of 20 lb, what is the total elongation in inches? What is the stress in the steel with E = 29,000 ksi?

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The total cross-sectional area of the load-bearing calcified portion of the two forearm bones (radius and ulna) is approximately 2.0 cm2. During a car crash, the forearm is slammed against the dashboard. The arm comes to rest from an initial speed of 80 km/h in 4.5 ms. If the aum has an effective mass of 3.0 kg, what is the compressional stress that the arm withstands during the crash? Pa Need Help? Read It

A firefighter weighs 730 N. She wears shoes that each cover an area of 309cm2. (a) What is the average stress she applies to the ground on which she is standing? (b) How does the stress change if she stands on only one foot? Show working equations for both (a) and (b). Answer must be in kPa.