A steel pipe of 400-mm outer diameter is fabricated from 10-mm- thick plate by welding along a helix that forms an angle of 208 with a plane perpendicular to the axis of the pipe. Knowing that the maximum allowable normal and shearing stresses in the directions respectively normal and tangential to the weld are s 5 60 MPa and t 5 36 MPa, determine the magnitude P of the largest axial force that can be applied to the pipe.

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A massive asteroid impact would create long-term changes in the atmosphere and climate of the planet. Upon impact, vaporized dirt and rock would fill the atmosphere, blocking sunlight and creating a state of near-permanent darkness and winter-like conditions.

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The angular surfaces of crushed stone make it perfect for forming flat surfaces when compacted or rolled. It makes a stable, interlocking base for concrete foundations, roads and floors.

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