\fdO'^ - Old Forge Coal Mines

STRENGTH OP MATERIALS. 223
(594) (a) Using formula 87,
P= 12,000 fl^' = 12,000 X (^) = 9,187.5 lb. Ans.
(d) Formula 88 gives P= 18,000^*.
Therefore, ^=VCj:=4/W^/4^^^^, An.
(595) The deflection is, by formula 75,
Wl' 1 W/"
s = a ,, = —— „ ,
, the coefficient being found from the
is / 192 -c /
*
table of Bending Moments.
Transposing, IV =-^, ;
.7854; s = ^.
/=
120; ^= 30,000,000; /=
_,, „. 192 X 30,000,000 X .7854 oo-v or lu a
Then, IV =
g ^ ^^q,
= 327.25 lb. Ans.
(596) (a) The maximum bending moment is, accord-
4. ^u ^ u^ c Ti A- Tvj . ^^ 6,000X60
mg to the table of Bendmg Moments, —r— = — j =
90,000 inch-pounds.
By formula 74,
5, = 120,000;/=
Hence, 90,000 =
5 /
J/ =90,000 = -^ -.
'^^ '^^^
10. ^=
c ^d 32
120,000 Ttd'
10 32 '
, .V90,000 X 10 X 32 -
, .,, ,,, ,
= ^-'^^ = ^ '
^^ ^=^ 120,000X3.1416
(^) Using formula 80,
"^^^^-^^
*/~H */75