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2. Block and tackle - Wikipedia

   en.wikipedia.org/wiki/Block_and_tackle

   An ideal block and tackle with a moving block supported by n rope sections has the mechanical advantage (MA), = =, where F A is the hauling (or input) force and F B is the load. Consider the set of pulleys that form the moving block and the parts of the rope that support this block.

3. Window - Wikipedia

   en.wikipedia.org/wiki/Window

   These were and are attached to the sashes using pulleys of either braided cord or, later, purpose-made chain. Three types of spring balances are called a tape or clock spring balance; channel or block-and-tackle balance, and a spiral or tube balance. Double-hung sash windows were traditionally often fitted with shutters. Sash windows can be ...

4. Pulley - Wikipedia

   en.wikipedia.org/wiki/Pulley

   Thus, the block and tackle reduces the input force by the factor p. A gun tackle has a single pulley in both the fixed and moving blocks with two rope parts supporting the load W. Separation of the pulleys in the gun tackle show the force balance that results in a rope tension of W/2.

5. Differential pulley - Wikipedia

   en.wikipedia.org/wiki/Differential_pulley

   At the other extreme, when r is zero, the system becomes a simple gun tackle with a mechanical advantage of 2. Comparison of a differential pulley (left) and a differential windlass or Chinese windlass (right). The rope of the windlass is depicted as spirals for clarity, but is more likely helices with axes perpendicular to the image.

6. Most say they probably won’t get updated COVID vaccine: Survey

   www.aol.com/most-probably-won-t-updated...

   Most Americans in a new poll said they probably won’t get an updated COVID-19 vaccine. The Pew Research Center survey found 60 percent said they are “probably not” going to “get an updated ...

7. Mechanical advantage - Wikipedia

   en.wikipedia.org/wiki/Mechanical_advantage

   In order to determine the mechanical advantage of a block and tackle system consider the simple case of a gun tackle, which has a single mounted, or fixed, pulley and a single movable pulley. The rope is threaded around the fixed block and falls down to the moving block where it is threaded around the pulley and brought back up to be knotted to ...