# Trying to solve a second order differential equation. Your advices

**URL:** <https://discourse.julialang.org/t/trying-to-solve-a-second-order-differential-equation-your-advices/41162>\
**Category:** Optimization (Mathematical)\
**Created:** [June 10, 2020, 9:04pm UTC](https://discourse.julialang.org/t/trying-to-solve-a-second-order-differential-equation-your-advices/41162 "2020-06-10T21:04:51Z")\
**Posts on this page:** 1\
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**Author:** ![aquarelle332](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/aquarelle332/32/20816_2.png) [@aquarelle332](https://discourse.julialang.org/u/aquarelle332)\
**Post date:** [June 22, 2020, 12:52pm UTC](https://discourse.julialang.org/t/trying-to-solve-a-second-order-differential-equation-your-advices/41162/10 "2020-06-22T12:52:53Z")

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Independently of the solution of the RP equation as written above, the difference of units between right-side terms (m^3/s² vs m/s²) results from the precedence of multiplication on “/” division (it is not trivial because it depends on both scientific communities and the use of / vs ÷):

```julia
(1/ρ*R) should be (1/(ρ*R))

```

In this way, every right-side terms are an acceleration (Unitful no longer complains and… a manually check is right).

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