Does the uncertainty principle affect our ability to follow the path of a baseball? Why or why not?
A) No, because the uncertainties in the position and momentum of the baseball are so small in comparison to its size and total momentum that they are unnoticeable.
B) Yes, because we cannot know both where the baseball is and which way it is going at the same time.
C) No, because the exclusion principle says that large objects are excluded from the consequences of the uncertainty principle.
D) No, because the uncertainty principle applies only to electrons.
A
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An object is placed in front of a convex mirror at a distance closer than the focal length of the mirror. The image will appear
A) behind the mirror. B) upright and reduced. C) upright and enlarged. D) inverted and reduced. E) inverted and enlarged.
In order to lift a bucket of concrete, you must pull up harder on the bucket than the bucket pulls down on you
A) True B) False
Carbon-fiber reinforced epoxy is being used as the outer surface material in high-performance aircraft where the surface temperatures are elevated because of the friction with air. The maximum-use temperature for epoxy resin is approximately 260°C. A composite sheet is produced from 75 vol % carbon fiber and 25 vol % epoxy resin. Assume that the epoxy and carbon are stress free at room temperature, and the composite is heated from room temperature (22°C) to 260°C during service. The elastic modulus of the carbon fiber is 380 GPa, the ultimate tensile strength is 2.4 GPa, and the axial thermal expansion coefficient is –0.7×10-6 K-1 . The elastic modulus of the epoxy resin is 4 GPa, the ultimate tensile strength is 0.07 GPa, and the thermal expansion coefficient is 60×10-6 K-1 .
(a) Calculate the thermal stresses, both the magnitude and sign, in the epoxy matrix and in the carbon fibers at 260°C. Assume that each material is elastic at all temperatures, and that there is good interface bonding. (b) Calculate the composite strain in heating from 22°C to 260°C. (c) Is there any component of this design that might cause a problem? Comment on the results in comparison to the data provided. If data is not available on these components, justify your evaluation of this design based upon your knowledge of these materials.
In the formula E = mc2, what does E represent?
A) the mass-energy, or potential energy stored in an object's mass B) the kinetic energy of a moving object C) the radiative energy carried by light D) the gravitational potential energy of an object held above the ground E) the electric field produced by a charge