problem21_31

University Physics with Modern Physics with Mastering Physics (11th Edition)

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21.31: a) Passing between the charged plates the electron feels a force upward, and just misses the top plate. The distance it travels in the y -direction is 0.005 m. Time of flight s 10 25 . 1 8 s m 10 60 . 1 m 0200 . 0 6 - × × = = = t and initial y -velocity is zero. Now, . s m 10 40 . 6 s) 10 25 . 1 ( m 005 . 0 so 2 13 2 8 2 1 2 2 1 0 × = × = + = - a a at t v y y But also . C N 364 C 10 60 . 1 ) s m 10 40 . 6 kg)( 10 11 . 9 ( 19 2 13 31 = = = = - - × × × E a e m eE m F b) Since the proton is more massive, it will accelerate less, and NOT hit the plates. To find the vertical displacement when it exits the plates, we use the kinematic equations
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Unformatted text preview: again: m. 10 73 . 2 s) 10 25 . 1 ( 2 1 2 1 6 2 8 p 2--× = × = = m eE at y c) As mention in b), the proton will not hit one of the plates because although the electric force felt by the proton is the same as the electron felt, a smaller acceleration results for the more massive proton. d) The acceleration produced by the electric force is much greater than g ; it is reasonable to ignore gravity....
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