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PLEASE ANSWER ONLY NUMBERS 7 and 8! Thank you
Problem: Two ACME-threaded power screws are to be used to raise
a platform as shown below. The total weight of the platform is =
50,000 lbs. divided equally between the 2 screws. Coefficient of
friction f = 0.15 for screw contact with the
yoke/nut.
Yoke/Nut 2 each power screws with ACME threads Preferred ACME Screw Thread Sizes 314 TABLE 17-1 Preſered Acme screw threads Nominal Threacs Pitch. Minisuun Min mom Tensile major poria p-lin ninar pich Stress stress diantes de climarin) diameter {m} area in cury 16 0.0625 01518 0.2013 0.006 32 0.3355 5/16 14 0.074 9.2140 0.2614 044* 0.4344 318 12 03831 0.263 2 0.316l 0.165 39 0.3976 7/16 12 0.0833 0.3253 0.378 3 0.6972 0.6396 112 ta 0.1000 0.3594 0.41 1223 0.2273 512 0.125 0.4570 0.5408 3195 DORO 6 0.1661 0.537 0.6424 2732 116 0.1667 0.0613 0.7003 1003 1.313 1 5 0.2009 0.7509 0726 $175 1.43 0.200 0.875 3 0.9967 68R1 1.722 0.000 0.999 1.121 XX31 3.952 0250 1.071 ISB 1.030 2,010 0.250 1.3439 1.250 0.250 3.5915 1.811 2.863 2.350 1.6948 1.8002 2.454 3.262 3 0.3333 1.8572 2.045 2.982 3.610 3 0.3333 2.1046 22939 1.872 4,073 0.3333 2.355 A 2.5427 4711 4.538 0.500 2.4326 27044 5.18 4.257 2 0.500 2.9314 3.2025 7.388 3.700 0.500 3.432 3.700 9985 0.010 0.500 3.9291 4.1991 12.972 300 4.4281 4.6973 16.35 8.511 "Per inch length of enement 1.1965 2.341 7.575