 #1
bluesteels
 28
 1
 Homework Statement:

How much work would it take to push two protons very
slowly from a separation of 2.00 * 10^10 m (a typical atomic distance) to 3.00 * 10^15 m (a typical nuclear distance)?
 Relevant Equations:

PE = kqq'/r
q = 1.61*10^19
r1= 2*10^10
r2= 3*10^15
k = (9*10^9)
u = (9*10^9)(1.61*10^19)^2 * (1/[3*10^15 ] 1/[2*10^10])
u = 7.68*10^14 J
but here the question. I have been taught that W= U so shouldn't the answer be negative??
When i look up at the solution all other sources say that the W = U and therefore the answer is in postive.
u = 7.68*10^14 J
but here the question. I have been taught that W= U so shouldn't the answer be negative??
When i look up at the solution all other sources say that the W = U and therefore the answer is in postive.