Answer:
Treatment options include medications, particularly tricyclic antidepressants and SSRIs,21,22 and psychotherapy. Nonpharmacologic treatment strategies (e.g., massage, acupuncture) may also be beneficial. patients initially presented with symptomatic pain due to a shoulder injury.
Answer:
it is required a mass of Zn equal to m= 1.608 gr of Zn
Explanation:
Assuming that the hydrogen behaves as an ideal gas ( in reality it has positive deviations from the gas law, but we can neglect the small correction) , then
P*V=n*R*T
n = P*V/(R*T)
where
P= absolute pressure = 775 mmHg = 1.02 atm
T= absolute temperature = 30°C+273 = 303 K
V= volume = 600 mL = 0.6 L
R = ideal gas constant = 0.082 atm*L/(mol*K)
n = number of moles of H₂ gas
replacing values
n = P*V/(R*T) = 1.02 atm*0.6 L/(0.082 atm*L/(mol*K)*303 K) = 0.0246 moles of H₂
from the reaction
Zn + 2 HCl ⇒ ZnCl2 + H2
since 1 mole of H2 requires 1 mole of Zn to react , then
m = nz * M
where
nz = number of moles of zinc = number of moles of H₂ gas = 0.0246 moles
M = molecular weight of zinc = 65.38 gr/mol
m = mass of zinc required
therefore
m= 0.0246 moles * 65.38 gr/mol = 1.608 gr of Zn
m= 1.608 gr of Zn
Correct position spring hold it
I think the correct answer would be the first option. Scientific models are used to allow scientists to extrapolate or interpolate data. Or in other words, allow them to predict values without performing more experiments. However, they are obtained by experiments first.
Answer:
The fundamental frequency is ![2f_0](https://tex.z-dn.net/?f=2f_0)
Explanation:
For an open-open pipe, the wavelength of the fundamental mode of vibration is equal to twice the length of the pipe:
![\lambda=2L](https://tex.z-dn.net/?f=%5Clambda%3D2L)
where L is the length of the pipe.
Moreover, from the wave equation we know that the frequency of the fundamental mode is inversely proportional to the wavelength, according to:
![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
Combining the two equations, we get
![f_0=\frac{v}{2L}](https://tex.z-dn.net/?f=f_0%3D%5Cfrac%7Bv%7D%7B2L%7D)
this means that the fundamental frequency in an open organ pipe is inversely proportional to the length of the pipe.
Here, the pipe is cut in a half, so the new length is
![L'=\frac{L}{2}](https://tex.z-dn.net/?f=L%27%3D%5Cfrac%7BL%7D%7B2%7D)
Therefore, since the speed of the sound wave does not change (it depends only on the medium), the new fundamental frequency will be:
![f'=\frac{v}{2L'}=\frac{v}{2(L/2)}=\frac{v}{L}=2f_0](https://tex.z-dn.net/?f=f%27%3D%5Cfrac%7Bv%7D%7B2L%27%7D%3D%5Cfrac%7Bv%7D%7B2%28L%2F2%29%7D%3D%5Cfrac%7Bv%7D%7BL%7D%3D2f_0)
So, the fundamental frequency has doubled.