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Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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
Transcribed Image Text:A 10 ton screw jack with a size of 2 3/4 - 3 acme thread. Assuming =0.125
due to average quality material and workmanship. Determine the torque
to lift and lower and efficiency for a) single thread b) double thread.
Answers should be a) 24% b) 38.47
Just help me find the solution. Thank you.
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- Gentlemen, please help to solve a,b,c as I faced confusing questions about screw jack. Conditions are: screw jack is lifting 3.2 tonnes, screw pitch is 12 mm, diameter of the screw is 5 mm. Coefficient of friction was not given but I think we will need it for total force calculation, lets take it 0.2. a) Calculate horizontal component to move the load - what is ment here by horizontal component? b) Calculate vertical component to move the load - what is ment here by vertical component? c) Total force needed to move the load with a lever of 0.82m d) Velocity ratio (VR=distance by effort/distance by load) Distance by effort (lever)=2 x 3.14 x 0.82 = 5.15m Distance by load = pitch= 12mm= 0.012 m VR=5.15/0.012= approx 429. e) Calculate efficiency. For this we need to have MA (mechanical advantage). It can be calculated when we know total force. Efficiency=Load (3200 x 9.8) / effortarrow_forwardWrite TRUE is the statement/s is True. If the statement is false, identify the word/s that makes the sentence incorrect and write its corresponding correct answer. 1. High cutting temperature is undesirable because it reduces tool life, produces hot chips and can cause inaccuracies in tool dimension due to thermal expansion. 2. Cubic boron nitride does chemically react with iron and nickel. 3. Nose wear is usually caused by rubbing of the tool along the machined surface of the workpiece.arrow_forwardWhat is a Couple Moment?arrow_forward
- where does the 64 come from?arrow_forwardQuestion 3 The Extrude Cut feature in SOLIDWORKS can be used to create both through holes (holes that go all the way through a part) and counter bore holes (holes that do not go all the way through a part), such as the holes shown in the 2-dimensional image below. True False Counterborearrow_forward
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