According to a Physics student in a row boat floating on the same river, the canoe has NO kinetc energy. Zero.
According to another Physics student standing on the riverbank watching both boats, the kinetic energy of the canoe is 12 Joules.
Both students are correct.
Answer: Your question is missing below is the question
Question : What is the no-friction needed speed (in m/s ) for these turns?
answer:
20.1 m/s
Explanation:
2.5 mile track
number of turns = 4
length of each turn = 0.25 mile
banked at 9 12'
<u>Determine the no-friction needed speed </u>
First step : calculate the value of R
2πR / 4 = πR / 2
note : πR / 2 = 0.25 mile
∴ R = ( 0.25 * 2 ) / π
= 0.159 mile ≈ 256 m
Finally no-friction needed speed
tan θ = v^2 / gR
∴ v^2 = gR * tan θ
v = √9.81 * 256 * tan(9.2°) = 20.1 m/s
Answer:
The frequencies are ![(f, f_1) = (6615.4 \ Hz , 19846.2\ Hz)](https://tex.z-dn.net/?f=%28f%2C%20f_1%29%20%3D%20%20%286615.4%20%5C%20Hz%20%2C%2019846.2%5C%20Hz%29)
Explanation:
From the question we are told that
The length of the ear canal is ![l = 1.3 \ cm =\frac{1.3}{100} = 0.013 \ m](https://tex.z-dn.net/?f=l%20%3D%201.3%20%5C%20cm%20%20%3D%5Cfrac%7B1.3%7D%7B100%7D%20%20%3D%20%200.013%20%5C%20m)
The speed of sound is assumed to be ![v_s = 344 \ m/s](https://tex.z-dn.net/?f=v_s%20%20%3D%20%20344%20%5C%20m%2Fs)
Now taking look at a typical ear canal we see that we assume it is a closed pipe
Now the fundamental harmonics for the pipe(ear canal) is mathematically represented as
![f = \frac{v_s}{4 * l }](https://tex.z-dn.net/?f=f%20%3D%20%5Cfrac%7Bv_s%7D%7B4%20%2A%20l%20%7D)
substituting values
![f = \frac{344}{4 * 0.013 }](https://tex.z-dn.net/?f=f%20%3D%20%5Cfrac%7B344%7D%7B4%20%2A%200.013%20%7D)
![f = 6615.4 \ Hz](https://tex.z-dn.net/?f=f%20%3D%206615.4%20%5C%20Hz)
Also the the second harmonic for the pipe (ear canal) is mathematically represented as
substituting values
Given that sound would be loudest in the pipe at the frequency, it implies that the child will have an increased audible sensitivity at this frequencies
Hooke's Law: F = - k x
Potential energy, PE = [1/2] k x^2 = [1/2] kx x = [kx][x/2] = -Fx/2
F = - 2*PE / x = - 2*0.0030J / 0.0047m = -1.28 N (the negative sigh indicates that the force is opposed to the displacement of the spring)
:
Answer:
The answer is B. heredity.
Explanation:
Obesity, smoking, and physical activity are all conscious decions thst can be made. Hope this helps :)