oldhomework 06-solutions

oldhomework 06-solutions - Reilly (mar3978) oldhomework 06...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Reilly (mar3978) oldhomework 06 Turner (56725) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 3) 10.0 points A proton has an initial velocity of 2 . 9 10 7 m / s in the horizontal direction. It enters a uniform electric field of 6700 N / C directed vertically. Ignoring gravitational effects, find the time it takes the proton to travel 0 . 027 m horizon- tally. Correct answer: 0 . 931034 ns. Explanation: Let : v x = 2 . 9 10 7 m / s , E = 6700 N / C , and x = 0 . 027 m . The electric field vector E is in the vertical ( y ) di- rection, so the electric force vector F elec = q vector E ex- erted by the field on the proton is also in the y-direction, with no component in the x- direction. Hence, the field can exert no force on the proton in the x-direction. This implies a constant speed in the x-direction. Conse- quently, x = v x t t = x v x = . 027 m 2 . 9 10 7 m / s 10 9 ns s = . 931034 ns . 002 (part 2 of 3) 10.0 points What is the vertical displacement of the pro- ton after the electric field acts on it for that time? Correct answer: 0 . 000278156 mm. Explanation: In the vertical direction, the proton experi- ences an electric force with magnitude F elec = q E = ma y a y = q E m = ( 1 . 60218 10- 19 C ) (6700 N / C) 1 . 67262 10- 27 kg = 6 . 41782 10 11 m / s 2 . The vertical dispacement is y = v t + 1 2 a t 2 = 1 2 a t 2 since v o = 0, so y y = 1 2 ( 6 . 41782 10 11 m / s 2 ) (9 . 31034 10- 10 s) 2 1000 mm 1 m = . 000278156 mm ....
View Full Document

Page1 / 4

oldhomework 06-solutions - Reilly (mar3978) oldhomework 06...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online