Friday

November 21, 2014

November 21, 2014

Posted by **Anil** on Saturday, March 31, 2012 at 3:44pm.

1)If the flow rate of the sprinkler is 2.5 gpm, derive a formula for calculating the time (hours) to apply D inches of water over one 20ft x 30ft area.

2)What are the units on the constant?

- math -
**Steve**, Saturday, March 31, 2012 at 7:49pm20ft*30ft*1in = 600ft^2-in

1 gal = 231 in^3

2.5gal = 577.5 in^3

1 ft^2-in = 144 in^3, so

2.5gal/min = 4.04 ft^2-in/min

or, .24935 min/ft^2 in

that's 149.61 min/600 ft^2-in

or, 2.4935 hr/600 ft^2-in

so, you will need roughly 2.5D hours to cover the area with D inches of water

since your formula is time(hr) = k*D(in), k must be in hr/in

**Answer this Question**

**Related Questions**

math - A lawn sprinkler covers a rectangular pattern of 20ft x 30ft. 1)If the ...

math - help please - A lawn sprinkler covers a rectangular pattern of 20ft x ...

math - Complete in Metric Conversions: A lawn sprinkler covers a rectangular ...

Math - Mr. Anderson has a whirling sprinkler for watering his lawn. The ...

math - The lawn sprinkler can be adjusted so that the water stream is from 25 to...

math - there is a sprinkler that rotates in a circle,if the sprinkler reaches 7 ...

math - A sprinkler has a range of 11m and rotates with a circular motion. If the...

college math - A sprinkler has a range of 11m and rotates with a circular motion...

Math - LaQuisha has a sprinkler that waters a circular area. The diameter of the...

Geometry - A gardener wants the three rosebushes in her garden to be watered by ...