For a high-temperature gas turbine application, you have chosen to use alumina ceramic material for a non-rotating part that is subject to modest forces. You find that you can save a significant amount of money by buying alumina that is of 1% lower density than more-expensive alumina, and in aircraft design saving weight is always desired. What aspect of the defect structure of the cheaper alumina should you investigate to determine its possible effects on mechanical properties, and why may this be important?
What will be an ideal response?
The lower density results from voids in the ceramic. Voids reduce the resistance to fracture in brittle ceramic materials.
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An astronaut is on a 100-m lifeline outside a spaceship, circling the ship with an angular speed of 0.100 rad/s. How far inward can she be pulled before the centripetal acceleration reaches 4g = 39.2 m/s2?
a. 50.0 m c. 72.7 m b. 70.6 m d. 89.9 m
A 20.0 kg mass is attached to the end of a 1.00 m steel rod with a 1.00 mm diameter. If the tensile modulus of steel is 
then the frequency of the simple harmonic motion of the mass is
A. 37.2 Hz. B. 30.4 Hz. C. 24.5 Hz. D. 20.1 Hz. E. 14.1 Hz.
Which of the following is not a phase of the Moon?
A) first-quarter moon B) third-quarter moon C) half moon D) full moon E) new moon
A quantity that has both a magnitude and direction associated with it is called a __________
Fill in the blank(s) with correct word