A tripod holding a nozzle, which directs a 5-cmdiameter stream of water from a hose. The nozzle mass is 10 kg when filled with water. The tripod is rated to provide 1800 N of holding force. A firefighter was standing 60 cm behind the nozzle and was hit by the nozzle when the tripod suddenly failed and released the nozzle. You have been hired as an accident reconstructionist and, after testing the tripod, have determined that as water flow rate increased, it did collapse at 1800 N. In your final report you must state the water velocity and the flow rate consistent with the failure and the nozzle velocity when it hit the firefighter. For simplicity, ignore pressure and momentum effects in the upstream portion of the hose.
A tripod holding a nozzle, which directs a 5-cmdiameter
stream of water from a hose.
The nozzle mass is 10 kg when filled with water. The tripod
is rated to provide 1800 N of holding force. A firefighter was
standing 60 cm behind the nozzle and was hit by the nozzle
when the tripod suddenly failed and released the nozzle.
You have been hired as an accident reconstructionist and,
after testing the tripod, have determined that as water flow
rate increased, it did collapse at 1800 N. In your final report
you must state the water velocity and the flow rate consistent
with the failure and the nozzle velocity when it hit the firefighter.
For simplicity, ignore pressure and momentum effects
in the upstream portion of the hose.
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