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A screw jack has 4 threads per inch. The mean radius of the thread is 2.338 inches. The mean diameter of the bearing surface under the cap is 3.25 inches. What is the turning moment required to raise the bload of 150 kg (

[A].	30.3 kg-inch	[B].	5.61 kg-inch
[C].	23.6 kg-inch	[D].	50.6 kg-inch

Answer: Option D

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