An electron is initially at rest. It is accelerated through a potential difference of 400 V. What is the kinetic energy of this electron?
A) 6.4 × 10-17 J
B) 400 J
C) 0 J
D) 800 J
E) 6400 J
A
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Indicate whether the statement is true or false
Wave Characteristics: For a certain electromagnetic wave in free space, at one instant the electric field vector points in the +z direction while the magnetic field vector points in the +x direction, as shown in the figure. In what direction is this wave traveling?
A. +x B. -x C. +y D. -y E. +z
What is a shock front?
A) a wave of pressure that moves faster than the speed of sound B) a wave of pressure that moves slightly slower than the speed of sound C) a wave of pressure that moves faster than the speed of light D) a wave of electromagnetic energy that can create electrical shocks E) the wave created when protons slam into electrons
In these figures, we see a boy named Billy riding a carnival ride called the Rotor and the free-body diagram for the forces acting on him. What must be the magnitudes of the vectors fwall,Billy and WEarth,Billy if Billy remains at the same height along the wall?
a. fwall,Billy is greater than WEarth, Billy to keep Billy from falling. b. The magnitudes of fwall,Billy and WEarth, Billy are equal. c. fwall,Billy depends on the magnitude of Nwall,Billy, but the magnitude of WEarth,Billy is always the same. d. Nwall,Billy and fwall,Billy must be equal in magnitude.