Steady-state creep rate data are given in the following table for some alloy taken at 200C (473 K): ` # s (h-1 ) S[MPa (psi)] 2.5 103 55 (8000) 2.4 102 69 (10,000) If it is known that the activation energy for creep is 140,000 J/mol, compute the steady-state creep rate at a temperature of 250C (523 K) and a stress level of 48 MPa (7000 psi).

Lecture 17: Test Review Lecture 18: (skipped) Lecture 19: Graphical Integration and Differentiation Graphical Integration and Differentiation Integral: area under a curve Derivative: slope of the tangent line to a curve Common integral/Derivative relationships Acceleration : ∫dt : velocity : ∫dt : distance Distance : d/dt : velocity : d/dt : acceleration Force : ∫dx : work Power : ∫dt : energy Energy : d/dt : power Current : ∫dt : charge Charge : d/dt : current Integral of a square If you know how to calculate the area of something, you can find the integral For a constant speed and a given time, you can calculate distance traveled just by multiplying the 2 values - the area of a square Integ