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Posted by on Tuesday, September 10, 2013 at 9:00pm.

A fire hose ejects a stream of water at an angle of 36.4 ° above the horizontal. The water leaves the nozzle with a speed of 20.1 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?

  • physics - , Friday, September 13, 2013 at 9:22pm

    Vo = 20.1m/2[36.4o]
    Xo = 20.1*cos36.4o = 16.18 m/s.
    Yo = 20.1*sin36.4o = 11.93 m/s.

    Y = Yo + g*t = 0 @ max. ht.
    11.93 + (-9.8)*t = 0
    -9.8t = -11.93
    Tr = 1.22 s. = Rise time.

    d = Xo * Tr = 16.18m/s * 1.22s = 19.7 m.

  • physics - , Thursday, September 19, 2013 at 11:21pm

    Airplane flight recorders must be able to survive catastrophic crashes. Therefore, they are typically encased in crash-resistant steel or titanium boxes that are subjected to rigorous testing. One of the tests is an impact shock test, in which the box must survive being thrown at high speeds against a barrier. A 41 kg box is thrown at a speed of 220 m/s and is brought to a halt in a collision that lasts for a time of 6.5 ms. What is the magnitude of the average net force that acts on the box during the collision?
    Round answer to nearest 100,000's place
    i.e. 123456789 would therefore be 123500000

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