\fdO'^ - Old Forge Coal Mines

196 HYDROMECHANICS.
(d)
See Art. 1005.
The theoretical velocity of discharge is t^ = ^%gTi, and as
// = 41 -^.434 = 94. 47 ft., we have 7/ = -^/2 X 32716 X 1)4.47
= 77.95 ft. per sec.
Using formula 31, Q — A i\ and multiplying by 60 to
reduce the discharge from cu. ft. per sec. to cu. ft. per min. ,
we have
^ ^'^
(490) {b)
f^/ X 77.95 X 60 = 57.39 cu. ft. per min. Ans.
144
Use formulas 31 and 38.
1 K» v" 7854
Qz=Av= ^': X 77.95 = .9568 cu. ft. per sec. Ans.
144
{a) (2a= • 615 (2 = . 615 X .
^'^
a_.5884_
e"- 79568-'^^^-
9568 = . 5884 cu. ft. per sec. Ans.
^'''•
(491) {a) 9 X 5 X .7854 = 35.343 sq. in. = area of base.
2' X .7854 = 3.1416 sq. in. = area of hole.
77—tt-t; = rrr-r-r^ J hencc, the area of the base is less than 20
o5.o4o 11.25
times the area of the orifice, and formula 35 must be used.
v-^/J^ - 4/
^x 32.16 x-e"- _
^-^ , a'~^ , (2' X .7854)^
^-A^
^- (9X5X.7854)-
" ^'^- ^"^^ "*
P^^
^^^^^^
(