The critical-stress intensity factor KIc for a glass-fiber reinforced epoxy matrix composite is 50 MPa(m)1/2, and the tensile strength is 500 MPa. In a design application, it is expected that the maximum stress is 400 MPa. What size crack could produce fracture of this composite? Assume that the geometrical factor Y is equal to 1.0.
What will be an ideal response?
The relationship between KIc crack size (a) and fracture stress ?f is that
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A container is filled with a mixture of helium (light molecules) and oxygen (heavy molecules) gases. A thermometer in the reads 22°C. Which gas molecules have the greater average speed?
A) It is the same for both of the gases because the temperatures are the same. B) The oxygen molecules do because they are diatomic. C) The oxygen molecules do because they are more massive. D) The helium molecules do because they are less massive. E) The helium molecules do because they are monatomic.
An ideal heat engine can have an efficiency of 1 if the temperature of the low temperature reservoir is
a. 0 K. b. 0°C. c. 0°F. d. 0°R. e. the same as the temperature of the heat source.
Escape Speed: Planet X-39 has a mass equal to 1/3 that of Earth and a radius equal to 1/3 that of Earth. If V is the escape speed for Earth, what is the escape speed for X-39?
A. V B. 3V C. 6V D. V/9 E. 9V
The two most important properties of any telescope are
A. the magnification and the light-gathering power. B. the light-gathering power and the length of the tube. C. the length of the tube and the magnification. D. the light-gathering power and the resolving power. E. the resolving power and the magnification.