For questions related to conversion of units.

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2
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1answer
44 views

Unit of value calculated by using integral

I have a really simple question that is driving me crazy! I have a program which can log power and the result is a log file which contains two arrays, one with time values that show when a power value ...
1
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1answer
67 views

Physics/Math conversion

I'm having difficulties solving this conversion. I know what to do at first but the way to set this up is a bit confusing:
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1answer
43 views

Conversion Question

A heavy rain fell on a city for 26 minutes, at a rate of 3.9mm/hr. If the area of the city is 244km^2, how many gallons of water fell on the city that day?
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1answer
19 views

Mpg to l/100km conversion problem?

We have two vehicles A: old truck that does 17 mpg (13.84 l/100km) B: old car that does 47 mpg (5.00 l/100km) We are looking to replace one of these vehicles with a new one (of the same ...
0
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1answer
24 views

How to use the metric conversion

I know how to use the metric conversion (K h d b d m c) when converting length to length for example 1 m squared to cm, etc. But I want to know how to use the metric conversion when converting from ...
0
votes
1answer
27 views

Distance/measurement question! Help!

There is a question in a book that I am trying to solve. "A man usually rides his bike 1 kilometers per hour, yet the wind slows him to 6.76 kilometers for 26 minutes and 5.55 kilometers for 10. How ...
0
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1answer
47 views

Is there a common notation for a group formed by appending a unit (eg. seconds) to some group?

Assume $(G,+)$ is an (abelian) group. And we have some unit $u$ (not the unit from ring theory, but some measurement unit like meters, seconds, etc.). Then with $G_u = \{k\ u \mid k \in G\}$ and ...
2
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0answers
17 views

Units for Measuring Rotation of a 3-Sphere in Four Dimensions

In four dimensions, there can be two orthogonal axes of simultaneous rotation (of two planes), right? Does that mean that we can measure such rotations of a 3-sphere in solid angles, much as we ...
2
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0answers
15 views

Local Solid Angle Units

This is a cultural question: Are there any, even moderately or historically used, units that measure solid angles which are not steradians? Basically, is there a unit x such that x:sr::grad:rad?
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0answers
48 views

What formula can I use to calculate how much protein per 100 calories a given food has?

I have an Excel spreadsheet of 529 items all with calories, carbs, fats, and protein listed. I'd like to add a grams of protein per 100 calories column but my math ability is embarrassingly ...
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0answers
91 views

Unit rules and style convention for division

I'm trying to figure out the preferred way to write unit expressions and division is causing me some confusion. I'm aware of the negative exponent notation, but here I'm looking for a solution using ...
0
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0answers
29 views

nondimensionalise an equation

The per capita birth rate of a population is given by $r[1-a(N-b)^2]$, r,a,b are positive parameters,, write down a population model equation such of the form $dN/dt=f(N)$ Nondimensionalise the ...
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0answers
13 views

Nondimensionalisation of second order ODE

I need to make this equation non dimensional: $$F(t) = m \frac{d^2x(t)}{dt^2} + c \frac{dx(t)}{dt} + k x(t)$$ I tried with: m[kg] c[kg/s] k[kg/s^2] x[m] t[s] $x = x_{REF}* \overline{x}$ where ...
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0answers
16 views

Convert a compound unit of heat to US units.

So, I must do the following conversion from my engineering textbook: $0.155 \frac{m^2 * ^{\circ} C}{W}$ to $\frac{^{\circ}F * ft^2 * hr}{Btu}$ I can get as far as: $0.155 \frac{m^2 * ^{\circ} ...
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0answers
18 views

Trouble with rate calculation

Imagine spending $60$ seconds pressing a lever for food reward. Every time you press the lever, food comes out. Let's say that you emit $14$ responses in those $60$ seconds, and that the average ...
0
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0answers
309 views

How to lay out the conversion of £ $(13 + v^{2}/52)$ per hour to £ per mile

"29. The total running cost of a ship per hour is £ (13 + $v^{2}$/52) where $v$ knots is the speed. if £ $C$ is the cost per nautical mile, write down an equation expressing $C$ in terms of $v$..." ...
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0answers
12 views

Unit conversion divison

I am working on a program that does some unit conversions but I am having a really tough time with one of them. 8000bits/10mbps(mega bits per second) i have no idea how to do this conversion , I ...