Answer:
2 seconds
Explanation:
The frequency of a wave is related to its wavelength and speed by the equation
![f=\frac{v}{\lambda}](https://tex.z-dn.net/?f=f%3D%5Cfrac%7Bv%7D%7B%5Clambda%7D)
where
f is the frequency
v is the speed of the wave
is the wavelength
For the wave in this problem,
v = 2 m/s
![\lambda=8 m](https://tex.z-dn.net/?f=%5Clambda%3D8%20m)
So the frequency is
![f=\frac{2}{8}=0.25 Hz](https://tex.z-dn.net/?f=f%3D%5Cfrac%7B2%7D%7B8%7D%3D0.25%20Hz)
The period of a wave is equal to the reciprocal of the frequency, so for this wave:
![T=\frac{1}{f}=\frac{1}{0.25}=4 s](https://tex.z-dn.net/?f=T%3D%5Cfrac%7B1%7D%7Bf%7D%3D%5Cfrac%7B1%7D%7B0.25%7D%3D4%20s)
This means that the wave takes 4 seconds to complete one full cycle.
Therefore, the time taken for the wave to go from a point with displacement +A to a point with displacement -A is half the period, therefore for this wave:
![t=\frac{T}{2}=\frac{4}{2}=2 s](https://tex.z-dn.net/?f=t%3D%5Cfrac%7BT%7D%7B2%7D%3D%5Cfrac%7B4%7D%7B2%7D%3D2%20s)
Answer:
The force of friction that acts on him is
![F_k=567N](https://tex.z-dn.net/?f=F_k%3D567N)
Explanation:
The firefighter with an acceleration of 3m/s^2 take the gravity acceleration as 10m/s^2 isn't necessary to know the coefficient of friction just to know the force of friction:
![F=m*a](https://tex.z-dn.net/?f=F%3Dm%2Aa)
![F=F_w-F_k](https://tex.z-dn.net/?f=F%3DF_w-F_k)
![m*a=F_w-F_k](https://tex.z-dn.net/?f=m%2Aa%3DF_w-F_k)
![F_w=81kg*10m/s^2=810N](https://tex.z-dn.net/?f=F_w%3D81kg%2A10m%2Fs%5E2%3D810N)
Sole to Fk
![81kg*3m/s^2=810N-F_k](https://tex.z-dn.net/?f=81kg%2A3m%2Fs%5E2%3D810N-F_k)
![F_k=810N-243N](https://tex.z-dn.net/?f=F_k%3D810N-243N)
![F_k=567N](https://tex.z-dn.net/?f=F_k%3D567N)
![F = k \cdot \frac{q_1 q_2}{d} = 9 \cdot 10^{9} \cdot \frac{0.25 \cdot 0.11}{0.88} = 144 \cdot 5^{9} \ N.](https://tex.z-dn.net/?f=F%20%3D%20k%20%5Ccdot%20%5Cfrac%7Bq_1%20q_2%7D%7Bd%7D%20%3D%209%20%5Ccdot%2010%5E%7B9%7D%20%5Ccdot%20%5Cfrac%7B0.25%20%5Ccdot%200.11%7D%7B0.88%7D%20%3D%20%20144%20%5Ccdot%205%5E%7B9%7D%20%5C%20N.)
If the separation between the charges is increased then the magnitude of the force will increase in fact how the distance is being used in that formula.
Jet streams are tied to global warming so I’m guessing hotter
The correct answer is that the surface winds will get stronger.