004 10.0 points A fireman, 56.4 m away from a burning building, directs a stream

Question

004 10.0 points A fireman, 56.4 m away from a burning building, directs a stream jet of water from a ground level fire hose at an angle of 40.1° above the horizontal. Ch 3 2D Motion- cardenas - (40649) I and with 1° the speed of the stream as it leaves the hose is 61.3 m/s, at what height will the The stream of water strike the Answer in units of m. 005 10.0 points A brick is thrown upward from the top of a bulding at an angle of 11.6 above the hori- zontal and with an initial speed of 17.2 m/s The acceleration of gravity is 98m/s If the brick is in flight for 3.1 s, how tall is the building Answer in units of m stone

Explanation / Answer

X-component of water stream = vcos40.1 = 61.3*0.765 = 46.89 m/s

Y-component = vsin40.1 = 61.3*0.644 = 39.47 m/s

time to reach 56.4 meters = 56.4/vx = 46.4/46.89 = 0.99 s

Calculation of height reached in that time:

s = ut + 0.5at^2

s = Vy*0.99 - 0.5*9.8*(0.99)^2 = (39.47*0.99) - (0.5*9.8*(0.99)^2) = 34.27 m

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