A fire hose straight-stream nozzle increases the speed of water leaving the hose. The nozzle is 4.76 cm in diameter where it connects to the hose and 2.54 cm in diameter at the open end. Water enters the nozzle at a speed of 4 m/s and a pressure of 2.0 x 10^5 Pa. a) What is the speed of the water as it leaves the nozzle?b) What is the pressure of the water as it leaves the nozzle?Please help. I have been working on this and can't get it. Thanks.
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There is no specific speed limit for trains in the city. Track circumstances will dictate what are safe operating speeds. As you admit to a poor judgment of distance I also believe you cannot estimate the speed the train is travelling. As others have noted trains do operate in many places at VERY high speeds. If there is NOTHING wrong your building it should not be shaking when a train passes if you are that far away the buildings closer would be having much more trouble than you. When an 18 wheeler passes your car you are a few feet away it is not the truck but the wind around it that causes most of your situation. This is almost the same with an EMPTY or loaded truck. If you are feeling vibrations from when the train crosses the bridge I would be more concerned with the safety of the Bridge. You could contact the particular railway involved to express your concerns about the specific track somewhere in Texas near some building by a bridge.
It depends upon the condition of the track, local laws, and probably many other factors.
