Skip to main content
Physics

Return to Question

Post Closed as "Duplicate" by BioPhysicist, Jon Custer, John Rennie, Roger V., Nikita
Deleted the 'vectors' tag and added the more relevant 'homework-and-exercises' tag.
Link
edit approved Nov 17, 2020 at 7:27
Andrew
edit approved Nov 17, 2020 at 7:27
Andrew
  • 835
  • 1
  • 8
  • 26
added 7 characters in body; edited tags
Source Link
Qmechanic ♦
Qmechanic ♦
  • 213.1k
  • 48
  • 590
  • 2.3k

Q.The The gravitational field due to a mass distribution is given by E=k/(x^3)$E=k/(x^3)$ in X$x$-direction. Taking the gravitational potential to be zero at infinity, find its value at a distance x$x$.

for the answer let the 'integral where the lower limit is infinity and upper limit x' be denoted as I

The answer my textbook gives to the above question is : enter image description here

shouldn't the dot product of E and dx (because we are traveling from infinity to a point) give - sign so the final answer should be negative.

Q.The gravitational field due to a mass distribution is given by E=k/(x^3) in X-direction. Taking the gravitational potential to be zero at infinity, find its value at a distance x.

for the answer let the 'integral where the lower limit is infinity and upper limit x' be denoted as I

The answer my textbook gives to the above question is : enter image description here

shouldn't the dot product of E and dx (because we are traveling from infinity to a point) give - sign so the final answer should be negative.

Q. The gravitational field due to a mass distribution is given by $E=k/(x^3)$ in $x$-direction. Taking the gravitational potential to be zero at infinity, find its value at a distance $x$.

for the answer let the 'integral where the lower limit is infinity and upper limit x' be denoted as I

The answer my textbook gives to the above question is : enter image description here

shouldn't the dot product of E and dx (because we are traveling from infinity to a point) give - sign so the final answer should be negative.

Source Link
MinigameZ more
MinigameZ more
  • 363
  • 2
  • 10

There is something I don't understand in the answer of the following question

Q.The gravitational field due to a mass distribution is given by E=k/(x^3) in X-direction. Taking the gravitational potential to be zero at infinity, find its value at a distance x.

for the answer let the 'integral where the lower limit is infinity and upper limit x' be denoted as I

The answer my textbook gives to the above question is : enter image description here

shouldn't the dot product of E and dx (because we are traveling from infinity to a point) give - sign so the final answer should be negative.