While air freight is energy inefficient, aircraft carry the greatest amount of freight
What will be an ideal response?
This is not correct. Much freight travels by railroad, ship, and truck. Far larger
volumes and weights are carried by the other carriers.
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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 string that is 0.26 m long is vibrating in its n = 6 harmonic. The sound from this string excites a pipe that is long and open at both ends into its second overtone resonance
What is the common resonant frequency of the string and the pipe? The speed of sound in air is 345 m/s. A) 760 Hz B) 690 Hz C) 390 Hz D) 490 Hz E) 590 Hz
Eighty-eight prominent groups of stars in the sky are called the ______________
Fill in the blank(s) with correct word
A conservative force can be a function only of position, and cannot depend on other variables like time or velocity
Indicate whether the statement is true or false