physics
posted by frost .
A fire hose ejects a stream of water at an angle of 37.9 ° above the horizontal. The water leaves the nozzle with a speed of 25.5 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?
i tried 25.5 sin 37.9 but it didn't work

physics 
Henry
V(ver) = 25.5sin37.9 = 15.66m/s.
The ver. distance is max when velocity
is 0:
Vf = Vo + gt = 0,
15.66 + (9.8)t = 0,
15,66  9.8t = 0,
9.8d = 15.66,
t(up) = 15.66 / 9.8 = 1.6s.
d(ver) = Vo*t + 0.5gt^2,
d(ver) = 15.66*1.6 + 0.5(9.8)(1.6)^2,
d(ver) = 25.06  10.39 = 14.67m.
d(hor) = 14.67 / tan37.9 = 18.84m = Distance from building. 
physics 
Henry
CORRECTION:
Vo(hor) = 25.5cos37.9 = 20.12m/s.
Vo(ver) = 25.5sin37.9 = 15.66m/s.
The ver distance is max when velocity
is zero:
Vf = Vo + gt = 0,
15.66 + (9.8)t = 0,
15.66  9.8t = 0,
9.8t = 15.66,
t(up) = 15.66 / 9.8 = 1.6s.
d(hor)=Vo * 2t = 20.12 * 3.2 = 64.3m =
Distance from building. 
physics 
tish
i ask my teacher he said it wasn't right
Respond to this Question
Similar Questions

Physics
A fire hose ejects a stream of water at an angle of 29.0° above the horizontal. The water leaves the nozzle with a speed of 31.0 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose … 
physics
A fire hose ejects a stream of water at an angle of 31.5 ° above the horizontal. The water leaves the nozzle with a speed of 24.3 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose … 
physics
A fire hose ejects a stream of water at an angle of 32.2 ° above the horizontal. The water leaves the nozzle with a speed of 26.5 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose … 
physics
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 … 
physics
A fire hose ejects a stream of water at an angle of 35.0º above the horizontal. The water leaves the nozzle with a speed of 25.0 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose … 
physics
A fire hose ejects a stream of water at an angle of 33.4 ° 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 … 
Physics
A fire hose ejects a stream of water at an angle of 30.9° above the horizontal. The water leaves the nozzle with a speed of 26.5 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose … 
physics
A fire hose ejects a stream of water at an angle of 31.7 ° above the horizontal. The water leaves the nozzle with a speed of 29.2 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose … 
physics
A fire hose ejects a stream of water at an angle of 31.7 ° above the horizontal. The water leaves the nozzle with a speed of 29.2 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose … 
Physics
A fire hose ejects a stream of water at an angle of 35.8 ° above the horizontal. The water leaves the nozzle with a speed of 21.9 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose …