For the PMMA in Figure 11.28, determine the power n and the preexponential constant A for the crack-propagation rate in Equation 11.20. It may be helpful to set up a ?K scale that is 10x to obtain the values of ?K.
What will be an ideal response?
Physics & Space Science
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A 1200-kg car moving at 15.6 m/s suddenly collides with a stationary car of mass 1500kg. If the two vehicles lock together, what is their combined velocity immediately after the collision?
A) 12.1 m/s B) 8.6 m/s C) 6.9 m/s D) 5.5 m/s
Physics & Space Science
A radar pulse returns 6.0 × 10-4 s after it was sent out and reflected by an object. What is the separation distance of the radar source and the object?
a. 1.8 × 105 m b. 9× 104 m c. 1.1 × 10-3 m d. 5.6 × 10-4 m
Physics & Space Science
By what factor will an intensity change when the corresponding sound level increases by 3 dB?
a. 3 b. 0.5 c. 2 d. 4 e. 0.3
Physics & Space Science
Which of the following web video formats was originally designed for Apple systems?
A. .avi B. .mov C. .mpeg D. .wmv
Physics & Space Science