4. A proton moves at 4.50x10^5 m/s in the horizontal direction. It enters a uniform vertical electric field with a magnitude of 9.60x10^3 N/C. Ignoring any gravitational effects, find
a) the time interval required for the protons to travel 5.00 cm horizontally
b) its vertical displacement during the time interval in which it travels 5.00 cm horizontally
c) the horizontal and vertical components of its velocity after it has traveled 5.00 cm horizontally
a)
time, t = distance travelled / speed
t = 0.05/ (4.5*10^5) = 1.11*10^-7 s
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b)
Vertical acceleration
ma = qE
a = qE/m = 1.6*10^-19* 9.6*10^3/ ( 1.67*10^-27)
a = 9.198*10^11 m/s^2
using 2nd equation of motion
y = 0.5 at^2
y = 0.5* 9.198*10^11* (1.11*10^-7)^2
y = 5.666*10^-3 m
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c)
Vertical velocity of proton
Vy = at = 9.198*10^11* 1.11*10^-7
Vy = 1.02*10^5 m/s
Horizontal velocity of proton
Vx = 4.5*10^5 m/s
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