A proton accelerates from rest in a uniform electric field of 635 N/C. At some time later, its speed is 1.30 × 106 m/s. What is the magnitude of its acceleration? The mass of a proton is 1.6726 × 10−27 kg and the fundamental charge is 1.602 × 10−19 C . Answer in units of m/s 2 . 031 (part 2 of 4) 10.0 points How long does it take the proton to reach this speed? Answer in units of s. 032 (part 3 of 4) 10.0 points How far has it moved in this time interval? Answer in units of m. 033 (part 4 of 4) 10.0 points What is its kinetic energy

Respuesta :

1) [tex]6.11\cdot 10^{10} m/s^2[/tex]

The force experienced by the proton is

[tex]F=qE[/tex]

where

[tex]q=1.6\cdot 10^{-19}C[/tex] is the proton charge

[tex]E=635 N/C[/tex] is the strength of the electric field

Substituting into the equation,

[tex]F=(1.6\cdot 10^{-19} C)(635 N/C)=1.02\cdot 10^{-16}N[/tex]

The acceleration of the proton is given by Newton's second law:

[tex]a=\frac{F}{m}[/tex]

where

[tex]F=1.02\cdot 10^{-16}N[/tex] is the force exerted on the proton

[tex]m=1.67\cdot 10^{-27} kg[/tex] is the proton's mass

Substituting,

[tex]a=\frac{1.02\cdot 10^{-16}N}{1.67\cdot 10^{-27}kg}=6.11\cdot 10^{10} m/s^2[/tex]

2)  [tex]2.13\cdot 10^{-5} s[/tex]

We can use the following equation:

[tex]a=\frac{v-u}{t}[/tex]

where

[tex]a=6.11\cdot 10^{10} m/s^2[/tex] is the acceleration of the proton

[tex]v=1.30\cdot 10^6 m/s[/tex] is the final velocity

u = 0 is the initial velocity

t is the time

Solving the equation for t, we find

[tex]t=\frac{v-u}{a}=\frac{1.30\cdot 10^6 m/s -0}{6.11\cdot 10^{10} m/s^2}=2.13\cdot 10^{-5} s[/tex]

3) 13.86 m

The distance travelled by the proton is given by the equation

[tex]d=ut + \frac{1}{2}at^2[/tex]

where

u = 0 is the initial velocity

[tex]t=2.13\cdot 10^{-5} s[/tex] s the time

[tex]a=6.11\cdot 10^{10} m/s^2[/tex] is the acceleration of the proton

Substituting,

[tex]d=0 + \frac{1}{2}(6.11\cdot 10^{10}m/s^2)(2.13\cdot 10^{-5} s)^2=13.86 m[/tex]

4) [tex]1.41\cdot 10^{-15} J[/tex]

The final kinetic energy of the proton is given by

[tex]K=\frac{1}{2}mv^2[/tex]

where we have

[tex]m=1.67\cdot 10^{-27} kg[/tex] is the proton's mass

[tex]v=1.30\cdot 10^6 m/s[/tex] is the final velocity

Substituting into the formula,

[tex]K=\frac{1}{2}(1.67\cdot 10^{-27}kg)(1.30\cdot 10^6 m/s)^2=1.41\cdot 10^{-15} J[/tex]

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