A fire fighter 32.0 m away from a building, directs a stream of water from a fire hose at an angle of 37 with speed of 40.0 m/s. At what height does the stream hit the building? C. 19.1 m D. 20.9 m D 32 5

A fire fighter 32.0 m away from a building, directs a stream of water from a fire hose at an angle of 37 with speed of 40.0 m/s. At what height does the stream hit the building? C. 19.1 m D. 20.9 m D 32 5

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.

Question

iven:
V = 20-(Horizontally)
Vyi = 0-,Required: the horizontal distance of the stone.
Vxi = 20.
1
Step1: y yi+Vyit-gt2
30%= 20 +0-
10 x t?
t= 2.0 seconds.
Step2: X = X, + vVxit = 0+ 20 x 2.0 = 40 meter.
- Correct Answer is A.
Problem (4):
A fire fighter 32.0 m away from a building, directs a stream of water from a fire hose at an angle
of 37 with speed of 40.0 m/s. At what height does the stream hit the building?
A.21.9 m
B. 22.5 m
C. 19.1 m
D. 20.9 m
Solution:
(X;%3D0
Xf = 32 m
%3D
Given:
Required: the height the stream will reach on the building.
Vi = 40-
0;=370
Vxi =V; Cos 0 = 40 x cos 37 = 31.9-
Step1:
Vyi = Vị sin 0 = 40 x sin 37 = 24.1-
%3D
%3D
%3D
%3D
Step2: X = X, + Vxit
%3D
32 =0+31.9 xt t%3D 1.0 second
Step3: y = y,+ Vyjt-gt
2812
3D0+
(24.1 x 1.0)-x 10 x 12)
3D19.1 meter.
3 Correct Answer is C..
59
S.

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