ultiple-choice questions may continue on e next column or page find all choices

Question

ultiple-choice questions may continue on e next column or page find all choices efore answerin 10.0 po ts Ay 14.5 ff an e with m above k- 42.8 m a s If the speed of the stream as it leaves the hose is 43.6 m/s, at what height will the stream of water strike the building? The acceleration due to gravity is 9.8 m/s Answer in units of m 005 10.0 points A brick is thrown upward from the top of a building at an angle of 10.3° above the horizontal and with an initial speed of 12 m/s. The acceleration of gravity is 9.8 m/s2 . If the brick is in flight for 2.9 s, how tall is the building? the stoneAnswer in units of m. eas does strike ation acceler- At im At wha land? Ans er in unit 004 10.0 points A fireman, 42.8 m away from a burning building, directs a stream jet of water from a ground level fire hose at an angle of 44.5 above the horizontal

Explanation / Answer

given,

horizontal distance = 42.8 m

angle = 44.5 degree

velocity = 43.6 m/s

since the horizontal velocity will remain constant

speed = distance / time

43.6 * cos(44.5) = 42.8 / time

time = 1.3763 sec

vertical distance covered in this time

s = ut - 0.5 * gt^2

s = 43.6 * sin(44.5) - 0.5 * 9.8 * 1.3763^2

s = 21.278 m

height = 21.278 m

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