Firemen are shooting a stream of water at a burning building using a high-pressure hose that shoots out the water with a speed of 25.0 m/s as it leaves the end of the hose. Once it leaves the hose, the water moves in projectile motion. The firemen adjust the angle of elevation θ of the hose until the water takes 3.0 s to reach a building 45.0 m away. You can ignore air resistance; assume that the end of the hose is at
Firemen are shooting a stream of water at a burning building using a high-pressure hose that shoots out the water with a speed of 25.0 m/s as it leaves the end of the hose. Once it leaves the hose, the water moves in projectile motion. The firemen adjust the angle of elevation θ of the hose until the water takes 3.0 s to reach a building 45.0 m away. You can
ignore air resistance; assume that the end of the hose is at ground level.
(a) Find the angle of elevation θ. Hint Answer: θ = 53.1◦
(b) Find the speed, v and acceleration a of the water at the highest point in its trajectory.
(c) How high above the ground does the water strike the building, and how fast is it moving just before it hits the building? Hint Answer: y = 15.9 m and v = 17.7 m/s
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