Senin, 02 September 2013

Find the time it takes to mow a football field with a lawn mower that mows in 24 inches for width?

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chris b


A physics problem I can not seem to solve...if you can help please give it step by step not just an answer...no values are given for rate or time, just the fact that the lawn mower cuts the grass in 24 inches length...


Answer
It's clearly not enough information to solve the problem.

What else do you need ? (I'll just make up some numbers)
Size of field: 50 yds by 100 yds
50 yds / (2/3 yd) = 75 = # passes up and down the field.

Assuming perfect coverage - no gaps or overlaps
and no time taken for turning around:

If it's a motorized mower and travels 6 mph.
6 * 1760 yds per hour = 176 yards per minute
7500 total yards to move / 176 = 42.6 minutes

If it's a guy pushing a mower at 2 mph,
then 3 x as long: 128 minutes (roughly) 2 hours 8 minutes.

Maybe they want a general formula:

(width of field / 24") * (length of field) * speed of mower
(50 x 36 / 24) x 100 yds / 176 yds per minute) =
75 x 100 x 100 / 176 = 42.61
=

i am selling some items at a garage sale and want your opinion on how much i should sell them for.?

Q. i am selling 3 mountain bikes:
-2 of them are adult mountain bikes, 2 years old, mint condition
-1 is a child mountain bike, 5 years old, good condition

i am also selling a lawn package that includes:
-1 6.75 hp self propelled craftsman push mower, 2 years old, mint condition
-1 weedeater, mint condition, 2 years old
-1 trimmer, mint condition, 1 year old

how much should i get for each bike and how much should i get for the lawn package?


Answer
I agree with the craigslist idea - garage sales are for cheep things y want gone quickly.
Id say as rough estimates:
2 Mountain bikes - $50-$75
1 Mountian bike - $15-20
Lawnpackage:
Lawnmower- $150
weedeater- $50-75
trimmer - $50 - so for whole thing say - $200-300
Usually bikes and pushmowers dont retain alot of value , not as much as a rider would




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