4 a screw jack having five threads per inch and a mean diameter of 1 2
4. A screw jack having five threads per inch and a mean diameter of 1.2 in. is used to raise or lower a weight of 5000 lb as shown. What force must be applied at the end of a 12 in.long handle to (a) raise the weight and (b) lower the weight? (fs=0.4)
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