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  2. List of commercially available roofing materials - Wikipedia

    en.wikipedia.org/wiki/List_of_commercially...

    Stone slabs require a very heavyweight roof structure, but their weight makes them stormproof. An obsolete roofing material, now used commercially only for building restoration. Collyweston stone slate named after the village of Collyweston; Solar shingle; Metal shakes or shingles. Long life. High cost, suitable for roofs of 3:12 pitch or greater.

  3. Series and parallel springs - Wikipedia

    en.wikipedia.org/wiki/Series_and_parallel_springs

    When putting two springs in their equilibrium positions in series attached at the end to a block and then displacing it from that equilibrium, each of the springs will experience corresponding displacements x 1 and x 2 for a total displacement of x 1 + x 2. We will be looking for an equation for the force on the block that looks like:

  4. Roof shingle - Wikipedia

    en.wikipedia.org/wiki/Roof_shingle

    Metal shingles on St. John's Church, Tzum, Netherlands 20307447 - RCE. Metal shingles are a type of roofing material that offers the appeal of traditional shingles, such as wood, tile, and slate, while providing high fire resistance and durability.

  5. List of roof shapes - Wikipedia

    en.wikipedia.org/wiki/List_of_roof_shapes

    See also roof pitch, crow-stepped, corbie stepped, stepped gable: A gable roof with its end parapet walls below extended slightly upwards and shaped to resemble steps. A-frame Half-hipped (clipped gable, jerkinhead [ 7 ] ): A combination of a gable and a hip roof (pitched roof without changes to the walls) with the hipped part at the top and ...

  6. Spring (device) - Wikipedia

    en.wikipedia.org/wiki/Spring_(device)

    Helical coil springs designed for tension A heavy-duty coil spring designed for compression and tension The English longbow – a simple but very powerful spring made of yew, measuring 2 m (6 ft 7 in) long, with a 470 N (105 lbf) draw weight, with each limb functionally a cantilever spring. Force (F) vs extension (s).

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