a ship's horn can be heard above typical background noise if at intensity level 20 dB.

a) what must be the power of the horn's output to achive this level at 5.0 km away?

b) how many identical ship horns would be needed to raise the level to 30 dB at 5.0 km?

Calculate the re-circulating load in the secondary crusher : A two stage crushing operation feeds 0.6 m diameter ore into a primary crusher at a rate of 25mt/hr. 80% of the ore feeds through an 0.2m screen into a secondary crusher. 65% of the ore from the secondary crusher comes out of a 50mm screen. |

How far horizontally off the edge does it hit the water : a student throws a rock with speed 20.0 m/s at 30 degrees off the edge of a cliff. how far horizontally off the edge does it hit the water |

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Calculate the mass flow rate for the concentrate stream : A magnetic separator processes 500 kg/hr of finely ground magnetite ore (Fe3O4). The ore containes 35% magnetite and an analysis of the concentrate and tailings shows that they contain 59.5% Fe and 3.8% Fe |

What must be the power of the horns output to achive : a ship's horn can be heard above typical background noise if at intensity level 20 dB. what must be the power of the horn's output to achive this level at 5.0 km away |

What is the incremental free cash flow for year one : Working capital is expected to increase by $5,000 at the inception of the project, but this amount will be recaptured at the end of year five. What is the incremental free cash flow for year one? |

A power plant operates a regenerative rankine cycle : A power plant operates a regenerative Rankine cycle with a reheat, one closed and one open feedwater heater and has a net power output of 1.2 x 109 Btu/hr. When the steam exits the boiler it's temperature is 1000°F and its pressure is 1400psi... |

Find is this a transverse wave or a longtudinal wave : a physics instrustor shakes a 2.0 m long alumium rod to create the pattern, find is this a transverse wave or a longtudinal wave |

Determine if a simple supported w beam has the capacity : Determine if a simple supported W 12x26 (A36 steel) beam has the capacity to support loads that produce 50 kips of live-load shear and 20 kips of dead-load shera. |

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