A light year is defined as the distance light can travel at 3 × 10^8 m/s in one year (365 days). How far is one light year in kilometers? Enter your answer accurate to two decimal places in scientific notation
9.46 × 10^12
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Write the energy balance for an adiabatic heat exchanger.
What will be an ideal response?
There is a dislocation with a Burger’s vector between the origin of an FCC copper (Cu) crystal at 0,0,0 and the nearest lattice point in the (001) plane. The Cu lattice parameter is 0.362 nm.
(a) What is the Burger’s vector of this dislocation, in vector notation? (b) What is the magnitude of the Burger’s vector?
Why are Earth and other planets spherical while smaller bodies such as most asteroids are not?
A. The larger mass of a planet produces enough gravity to pull it into a round shape. B. It is the nature of massive objects to pull themselves into spherical shapes. C. Asteroids were never molten, and so never underwent differentiation. D. Earth and other planets formed from planetesimals pulled together by gravity into circular orbits. E. The atmosphere of a planet is heavy enough to push the planet into a round shape.
PET, the diagnostic method, stands for
A. patterned electron technique. B. positron emission tomography. C. proton-electron transmission. D. penetrating emission technique. E. None of these choice are correct.