physics help? kinetic energy?
An electron moves at 5000 km/s toward the front of a tube-type tv. when it hits the screen, it is stopped in 12 microseconds.
- the kinetic energy of the electron
- power requirement to stop the electron
- NCSLv 71 month agoFavorite Answer
KE = ½ * 9.11e-31kg * (5000e3 m/s)² = 1.14e-17 J
(or about 71 eV)
P = work / time = KE / t = 1.14e-17J / 12e-6s = 9.5e-13 W
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