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SVcummins

Well-known Member
Their hand at some calculations?
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cvphoto47948.png


This is the time it took to travel the width and length of a field at 4 mph on two sides if All four sides are equal how many acres is in the field ? Can it be figured with just these numbers
 
Searching for your answer I found this mph to feet per second calculator in the link. At 4 mph it says you travel 5.87 feet. I converted your times into seconds to come up with the following. 1st number 589 ft. 2nd number 1224.7 ft. multiplied gives 721289 to equal square ft. Divided by square ft of an acre 43560. Giving 16.55 acres. Let’s see if anyone else agrees.
Distance calculator
 
4 miles equals 4 times 5280 or 21120 feet in an hour.

Divided by 60 = 352 feet in a minute

Divided by 60 again = 5.87 feet per second.

1 minute 6.41 seconds equals 66.41 seconds times 5.87 feet per second = 389.6 feet on the short side.

3 minutes 28.62 seconds equals 208.62 seconds times 5.87 feet per second = 1224.6 on the long side.

389.6 times 1224.6 = 477104.16 square feet.

Divide that by 43560 square feet in an acre I come up with 10.95 acres.
 
Close. I came up with 389.6 but rechecking gives me 389.8 on the short side. Then again, timing to the hundredth of a second is probably not all that accurate. I'd round it off to 10 acres.
 
And counting on an exact speed I think is troublesome. My one guidance system is constantly flickering up and down at least two tenths of a MPH.
 
It would be much easier to have a width with a length then just times the length by the width to get acres per swath then times the number of swaths. Or since you have a GPS it should be able to figure acres as you spray for you.
 
If the 4 mph speed is off by even 5% (which is very likely - that's only +/- .2 mph) your acreage calculation will range from 10 and 12 acres. Using this method to measure a field I wouldn't expect any better than this level of accuracy. Certainly not down to the fraction of an acre. (A scientist or engineer would say that since one of the numbers you started with has only one significant digit (4 mph) your final answer can only have one significant digit as well. Any more would be assuming accuracy that simply doesn't exist in your calculation.)
 
Per this calculation fawteen is correct. I transposed my first number or whatever you want to call it, his 389... is correct. I should have been sleeping instead of calculating. Blackhole, maybe you are trying to be funny or nit-picking, yes he should not have stated it as he did. I just interpreted it as fawteen did that if his field sides were labeled A, B, C and D clockwise looking from above sides A and C are equal as are sides B and D. Were you one of those kids in school who were always arguing with the teacher to throw out a test question because it had some small wording inconsistency? Lol!
 
I mis worded That 2 each equal sides of each time it’s a rectangle not a square and not any kind of triangle
 
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