what are 1st 2nd and 3rd class levers?
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There are three classes of lever 1st, 2nd and 3rd class. First class levers have the fulcrum between the force and the load. ... In second class levers the load is between the effort (force) and the fulcrum.
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In a class one lever the force of the effort (Fe) multiplied by the distance of the effort from the fulcrum (de) is equal to the force of the resistance (Fr) multiplied by the distance of the resistance from the fulcrum (dr). The effort and the resistance are on opposite sides of the fulcrum.
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Levers can be used to exert a large force over a small distance at one end by exerting only a small force over a greater distance at the other. see-saw, bottle opener, etc. A lever (/ˈliːvər/ or US: /ˈlɛvər/) is a simple machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum.
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1A refers to the AC First class which is the most comfortable coach you could find. 2A refers to AC Second class (AC two tier) which is air conditioned and has two berths (wider) instead of three on one side. 3A refers to AC Third class (AC three tier) which is also air conditioned.
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Lever. ... A lever (/ˈliːvər/ or US: /ˈlɛvər/) is a simple machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum. A lever is a rigid body capable of rotating on a point on itself. On the basis of the locations of fulcrum, load and effort, the lever is divided into three types.
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1st Class - we aim to deliver the next working day*. This includes: Royal Mail Signed For® 1st Class** Royal Mail 24®
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Degree classifications i) (60-70%) Lower Second-Class Honours (2:2, 2. ii) (50-60%) Third-Class Honours (Third or 3rd) (40-50%)
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In its simplest form, a lever is a stick that is free to pivot or move back and forth at a certain point. ... The point on which the lever moves is called the fulcrum. By changing the position of the fulcrum, you can gain extra power with less effort. A good example of a lever is a see-saw.
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Class 2B Thread consists of a 2A screw in a 2B hole. This 2B Thread has wide application, accommodates plating, finishes, and coating to a limited extent and, therefore, has fair tolerance allowances. Class 3B Thread means a 3A Screw in a 3B Nut or threaded hole for applications where tolerance limits are close.
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Degree classifications First-Class Honours (First or 1st) (70% and above) Upper Second-Class Honours (2:1, 2. i) (60-70%)
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The ankle is not the third-class lever in the body. ... In a third-class lever, the most common in the human body, force is applied between the resistance (weight) and the axis (fulcrum). There are numerous third-class levers in the human body; one example can be illustrated in the elbow joint.
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Second AC or AC 2-tier (2A) This is second AC Sleeper class by the Indian Railways. In terms of features it stands less than the first ac coaches but in terms of service and comfort this class is way above 3A class. It has 6 berths in each compartment.
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First Class AC (1AC), is the most expensive and luxurious accommodation that the Indian Railway offers. The berths will limited to each compartment having only 2 or 4 berths. The coach will be divided into coupes and cabins, each having a door which can be locked from inside.
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2A: AC 2-tier sleeper, usually the highest class in most trains. This class offers privacy with 2tier of seats/berths one above another with curtains.
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Classes 2A and 2B are the most common thread classes in use, offering a balance of ease of manufacture, cost, and performance. Classes 3A and 3B are best suited where close tolerances, safety, and strength are required, and thus are frequently specified for socket cap and socket set screws.
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1st class welders are those coded eg to Asme etc or in Oz they have certification scheme called AS 1796 part 1 to 9. Which is harder than ASME, but once passed it is valid for life. 2nd class welders are general welders who have served their time (or not) or fabricators but have no codings or certification.
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In a Class Two Lever, the Load is between the Force and the Fulcrum. The closer the Load is to the Fulcrum, the easier the load is to lift. Examples include wheelbarrows, staplers, bottle openers, nut cracker, and nail clippers. A great example of a Class Two Lever is a wheelbarrow.