You observe a 1-cm-long crack in the middle of the glass windshield of your car. Compare the expected fracture strength of your defective glass windshield to that of a new one that has a tensile fracture strength of 69 MPa. Assume that the KIc of glass is 0.84 MPa?m1/2.
What will be an ideal response?
The relationship between critical stress intensity factor, crack size, and fracture stress is given by
The strength of the window has been reduced by a factor of 10 by this crack.
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These photos show two different astronomical objects. Which object is bigger, and by about how much?
A) Object 2 is more than a trillion times as large as Object 1. B) Object 2 is approximately 1,000 times as large as Object 1. C) Object 2 is about 10 times as large as Object 1. D) Object 1 is about 10 times as large as Object 2. E) Both objects are about the same size.
Within Earth's atmosphere the ozone layer is located:
A) in the troposphere. B) between the troposphere and the stratosphere. C) in the stratosphere. D) between the stratosphere and the mesosphere. E) in the mesosphere.
Two beams of coherent light start out at the same point in phase and travel different paths to arrive at point P. If the maximum destructive interference is to occur at point P, the two beams must travel paths that differ by
A) a whole number of wavelengths. B) an odd number of half-wavelengths. C) a whole number of half-wavelengths.
The kilowatt-hour is a unit of
a. power c. voltage b. energy d. current