How much work does an electric field do in moving a proton

AI Thread Summary
The discussion focuses on calculating the work done by an electric field in moving a proton from a potential of +95 V to -37 V. The relevant equation used is deltaPE = q * Vba, where q is the charge of the proton. The initial calculation yields a potential energy change of 2.2e-17 J. Participants suggest rechecking the calculations, particularly for the voltage difference, and emphasize the importance of using electron volts as a unit for clarity. The conversation highlights the need for accuracy in calculations and understanding unit conversions in physics problems.
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Homework Statement



How much work does the electric field do in moving a proton from a point with a potential of +95 V to a point where it is -37 V? Express your answer both in joules and electron volts.
_____eV
_____J

Homework Equations



deltaPE = q * Vba

The Attempt at a Solution



PE = (-1.6e-19)(138)
PE = 2.2e-17 J

1.6e-19 / 12.2e-17 = .007 eV
 
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you may want to recheck your calculation for Vba.
 
You might also think about why you use eV for the units and what step this migth save you!
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
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Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
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