I believe the answer is D. <span> More sunlight is trapped by the atmosphere to cause global warming.
Even though Atmosphere usually contains Co2, the amount is really minor and heat from the Sunlight usually still able to reflected outside under noermal circumtances. But, due to usage of fossil fuels, the amount of CO2 in the atmosphere is significantly increased and making the sunlight unable to reflected outside and trapped within the Earth.</span>
I think it’s output because output work is work done by a machine
Answer:
![5.87*10^{-4}W](https://tex.z-dn.net/?f=5.87%2A10%5E%7B-4%7DW)
Explanation:
Given that:
![\beta = 89,6 dB](https://tex.z-dn.net/?f=%5Cbeta%20%3D%2089%2C6%20dB)
![D = 13.0 cm](https://tex.z-dn.net/?f=D%20%3D%2013.0%20cm)
![r = \frac{D}{2}\\ = \frac{13.0}{2}\\ = 6.5 cm\\=0.065m](https://tex.z-dn.net/?f=r%20%3D%20%5Cfrac%7BD%7D%7B2%7D%5C%5C%20%3D%20%5Cfrac%7B13.0%7D%7B2%7D%5C%5C%20%3D%206.5%20cm%5C%5C%3D0.065m)
Efficiency = 2.06 % = 0.0206
The intensity level of sound is given by the formula:
![\beta = (10dB) log (\frac{I}{I_o} )](https://tex.z-dn.net/?f=%5Cbeta%20%3D%20%2810dB%29%20log%20%28%5Cfrac%7BI%7D%7BI_o%7D%20%29)
![\frac{\beta}{(10dB) } =log (\frac{I}{I_o} )](https://tex.z-dn.net/?f=%5Cfrac%7B%5Cbeta%7D%7B%2810dB%29%20%7D%20%3Dlog%20%28%5Cfrac%7BI%7D%7BI_o%7D%20%29)
Taking their exponential; we have :
![10^{\frac{\beta}{10dB}}= \frac{I}{I_o}](https://tex.z-dn.net/?f=10%5E%7B%5Cfrac%7B%5Cbeta%7D%7B10dB%7D%7D%3D%20%5Cfrac%7BI%7D%7BI_o%7D)
![I = I_o(10^{\frac{\beta}{10dB}})](https://tex.z-dn.net/?f=I%20%3D%20I_o%2810%5E%7B%5Cfrac%7B%5Cbeta%7D%7B10dB%7D%7D%29)
Replacing our values; we have:
![I = (10^{-12}W/m^2)(10^{\frac{89.6}{10dB}})](https://tex.z-dn.net/?f=I%20%3D%20%2810%5E%7B-12%7DW%2Fm%5E2%29%2810%5E%7B%5Cfrac%7B89.6%7D%7B10dB%7D%7D%29)
![= 9.12 *10^{-4}W/m^2](https://tex.z-dn.net/?f=%3D%209.12%20%2A10%5E%7B-4%7DW%2Fm%5E2)
Power Output;
![P_{out} = IA\\P_{out}=I(\pi r^2)\\P_{out}=(9.12*10^{-4}W/m^2)(3.14)(0.065m)^2\\P_{out}=1.2099048*10^{-5} W](https://tex.z-dn.net/?f=P_%7Bout%7D%20%3D%20IA%5C%5CP_%7Bout%7D%3DI%28%5Cpi%20r%5E2%29%5C%5CP_%7Bout%7D%3D%289.12%2A10%5E%7B-4%7DW%2Fm%5E2%29%283.14%29%280.065m%29%5E2%5C%5CP_%7Bout%7D%3D1.2099048%2A10%5E%7B-5%7D%20W)
The power output that is required to produce a 89.6 dB sound intensity level for a 13.0 cm diameter speaker that has an efficiency of 2.06% is;
![P_{in}= \frac{P_{out}}{0.0206}](https://tex.z-dn.net/?f=P_%7Bin%7D%3D%20%5Cfrac%7BP_%7Bout%7D%7D%7B0.0206%7D)
![P_{in}= \frac{{1.2099048*10^{-5}}}{0.0206}](https://tex.z-dn.net/?f=P_%7Bin%7D%3D%20%5Cfrac%7B%7B1.2099048%2A10%5E%7B-5%7D%7D%7D%7B0.0206%7D)
![P_{in}= 5.87*10^{-4}W](https://tex.z-dn.net/?f=P_%7Bin%7D%3D%205.87%2A10%5E%7B-4%7DW)
Therefore, The power output that is required to produce a 89.6 dB sound intensity level for a 13.0 cm diameter speaker that has an efficiency of 2.06% is ![5.87*10^{-4}W](https://tex.z-dn.net/?f=5.87%2A10%5E%7B-4%7DW)
Answer:
the type of tomato plants used.
Explanation:
Answer:
![T=2.5*10^{-3}s](https://tex.z-dn.net/?f=T%3D2.5%2A10%5E%7B-3%7Ds)
Explanation:
From the question we are told that:
Beat frequency ![F_b=4](https://tex.z-dn.net/?f=F_b%3D4)
Frequency ![F=400Hz](https://tex.z-dn.net/?f=F%3D400Hz)
Generally the equation for Frequency of the violin is mathematically given by
![f_v=F_b+F](https://tex.z-dn.net/?f=f_v%3DF_b%2BF)
![f_v=4+400Hz](https://tex.z-dn.net/?f=f_v%3D4%2B400Hz)
![f_v=404Hz](https://tex.z-dn.net/?f=f_v%3D404Hz)
Therefore the period of the violin string oscillations is
![T=\frac{1}{f_v}](https://tex.z-dn.net/?f=T%3D%5Cfrac%7B1%7D%7Bf_v%7D)
![T=\frac{1}{404}](https://tex.z-dn.net/?f=T%3D%5Cfrac%7B1%7D%7B404%7D)
![T=2.5*10^{-3}s](https://tex.z-dn.net/?f=T%3D2.5%2A10%5E%7B-3%7Ds)