Anonymous
Anonymous asked in Science & MathematicsPhysics · 1 month ago

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.

Determine...

- the kinetic energy of the electron

- power requirement to stop the electron

1 Answer

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  • NCS
    Lv 7
    1 month ago
    Favorite 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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