At a _________wall the unpaired electron spins orientation changes from one orientation to another.
Fill in the blank(s) with the appropriate word(s).
Bloch
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A refrigerator uses mechanical work to transfer heat from a colder region to a hotter one, as shown in this schematic. Why is it not possible to remove heat from the cold region and transfer it to the hot region without the input of work by an external source?
a. It would violate the first law of thermodynamics. b. It would violate the second law of thermodynamics. c. Both a. and b. d. It would be possible only if the machine did not lose some energy as heat because of friction.
Compare two collisions that are perfectly inelastic. In case (A) a car traveling with speed V collides head-on with a sports car having half the mass and traveling in the opposite direction with twice the speed. In case (B) an identical car traveling with the same speed V collides head-on with a light truck having twice the mass and traveling in the opposite direction with half the speed
A 50.0-kg box is being pushed along a horizontal surface by a force of 250 N directed 28.0° below the horizontal. The coefficient of kinetic friction between the box and the surface is 0.300. What is the acceleration of the box?
A) 0.769 m/s2 B) 1.77 m/s2 C) 3.16 m/s2 D) 6.31 m/s2 E) 8.53 m/s2
As seen from Mars orbiters, ______________ and ______________ are cut, possibly by sudden floods or drainage that occur on a longer timescale
Fill in the blank(s) with correct word