A dam is inclined at an angle of 30± from the vertical and has the shape of an isoceles trapezoid 100 ft wide at the top and 50 ft wide at the bottom and with a slant height of 70 ft. Find the hydrostatic force on the dam when it is full of water.
Dec 8th 2008, 09:33 PM
nevermind i got the answer yay!!
Dec 9th 2008, 04:56 PM
Whoa I got this same problem.. How do you do it?
Dec 9th 2008, 05:17 PM
Since it is 30 degrees to the vertical, then we can use sin(60), which I will represent in radians.
Dec 9th 2008, 06:01 PM
Thanks for your help!
I think mostly I'm having trouble drawing the picture, so I can't really get any farther than that. Would you mind redrawing with the given information?
Dec 9th 2008, 07:54 PM
christinaaa, r u also in pham's class ? lol
for finding height of dam = sqrt((70)^2 - (25)^2) cos30
then for width of trapezoid = 100-x/h (100-50)
then u take the integral of the width which u got from above, from 0 to h
Dec 9th 2008, 09:24 PM
Do you have a picture?
Isn't the formula for hydrostatic force something like F = the integral of 1000 x 9.8 x area of the dam, from 0 to h?