Iridium was the element that first alerted us to the unusual dust left behind by the K-T boundary event
Indicate whether the statement is true or false
TRUE
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Nanostructured materials can have unique properties. For materials with dimensions measured in nanometers the amount of surface energy is comparable to the bonding energy in the material.
(a) Compare the magnitude of the total surface energy to the total bond energy for a sphere of Ni atoms with one atom at the center surrounded by twelve nearest neighbors. The surface energy of Ni is 1.90 J/m2, the cohesive energy of Ni is –4.435 eV/atom, and the lattice parameter of FCC Ni is 0.352 nm. Assume that the total radius of this sphere is equal to 1 atomic diameter. (b) Is this 13-atom cluster of atoms stable?
A design requires a material that must operate up to a temperature of 300°C (572°F), have a high resistance to deformation, a high strength, a high resistance to fracture, and a low cost. Which of the following materials is most likely to best satisfy the design requirements?
(a) Alumina ceramic (b) Low-carbon steel (c) Polyethylene (d) Graphite-reinforced epoxy
A coil lies flat on a horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly
When viewed from above, what is the direction of the induced current in this coil as the field disappears? A) counterclockwise B) clockwise C) clockwise initially, then counterclockwise before stopping D) counterclockwise initially, then clockwise before stopping E) There is no induced current in this coil.
The places where the Sun crosses the equator are called the:
A) annalemmas. B) prime meridians. C) zeniths. D) equinoxes. E) solstices.