Answer:
1- C 2-B 3-B - these are ur best answers
Explanation:
You first find the mass and the volume of that object. Then you divide mass ÷ volume
Answer:
, level is rising.
Explanation:
Since liquid water is a incompresible fluid, density can be eliminated of the equation of Mass Conservation, which is simplified as follows:
![\dot V_{in} - \dot V_{out} = \frac{dV_{tank}}{dt}](https://tex.z-dn.net/?f=%5Cdot%20V_%7Bin%7D%20-%20%5Cdot%20V_%7Bout%7D%20%3D%20%5Cfrac%7BdV_%7Btank%7D%7D%7Bdt%7D)
![\frac{\pi}{4}\cdot D_{in}^2 \cdot v_{in}-\frac{\pi}{4}\cdot D_{out}^2 \cdot v_{out}= \frac{\pi}{4}\cdot D_{tank}^{2} \cdot \frac{dh}{dt} \\D_{in}^2 \cdot v_{in} - D_{out}^2 \cdot v_{out} = D_{tank}^{2} \cdot \frac{dh}{dt} \\\frac{dh}{dt} = \frac{D_{in}^2 \cdot v_{in} - D_{out}^2 \cdot v_{out}}{D_{tank}^{2}}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Cpi%7D%7B4%7D%5Ccdot%20D_%7Bin%7D%5E2%20%5Ccdot%20v_%7Bin%7D-%5Cfrac%7B%5Cpi%7D%7B4%7D%5Ccdot%20D_%7Bout%7D%5E2%20%5Ccdot%20v_%7Bout%7D%3D%20%5Cfrac%7B%5Cpi%7D%7B4%7D%5Ccdot%20D_%7Btank%7D%5E%7B2%7D%20%5Ccdot%20%5Cfrac%7Bdh%7D%7Bdt%7D%20%5C%5CD_%7Bin%7D%5E2%20%5Ccdot%20v_%7Bin%7D%20-%20D_%7Bout%7D%5E2%20%5Ccdot%20v_%7Bout%7D%20%3D%20D_%7Btank%7D%5E%7B2%7D%20%5Ccdot%20%5Cfrac%7Bdh%7D%7Bdt%7D%20%5C%5C%5Cfrac%7Bdh%7D%7Bdt%7D%20%20%3D%20%5Cfrac%7BD_%7Bin%7D%5E2%20%5Ccdot%20v_%7Bin%7D%20-%20D_%7Bout%7D%5E2%20%5Ccdot%20v_%7Bout%7D%7D%7BD_%7Btank%7D%5E%7B2%7D%7D)
By replacing all known variables:
![\frac{dh}{dt} = \frac{(0.3 ft)^{2}\cdot (5 \frac{ft}{s} ) - (0.4 ft)^{2} \cdot (2 \frac{ft}{s} )}{(10 ft)^{2}}\\\frac{dh}{dt} = 1.3 \times 10^{-3} \frac{ft}{s}](https://tex.z-dn.net/?f=%5Cfrac%7Bdh%7D%7Bdt%7D%20%3D%20%5Cfrac%7B%280.3%20ft%29%5E%7B2%7D%5Ccdot%20%285%20%5Cfrac%7Bft%7D%7Bs%7D%20%29%20-%20%280.4%20ft%29%5E%7B2%7D%20%5Ccdot%20%282%20%5Cfrac%7Bft%7D%7Bs%7D%20%29%7D%7B%2810%20ft%29%5E%7B2%7D%7D%5C%5C%5Cfrac%7Bdh%7D%7Bdt%7D%20%3D%201.3%20%5Ctimes%2010%5E%7B-3%7D%20%5Cfrac%7Bft%7D%7Bs%7D)
The positive sign of the rate of change of the tank level indicates a rising behaviour.
I think it’s speed will increase, if I understood it correctly
2.89watts.
<h3>What is meant by sound intensity?</h3>
- The average rate at which sound energy moves across a unit area normal to a given direction is used to determine a sound's intensity. This rate is generally stated in ergs per second per square centimeter.
- Decibels are the units used to measure sound intensity, often known as sound power or sound pressure. The decibel (dB) unit is named after Alexander Graham Bell, who also created the audiometer and the telephone. An audiometer is a tool to gauge a person's hearing capacity for various noises.
- Our ability to measure the flow of sound energy as a time-averaged vector quantity makes sound intensity measuring an effective method. We can identify sound sources and tell direct sound from reverberant sound in a room using the characteristics of sound intensity.
How much power is radiated as a sound from a band whose intensity is 1.6x10-3 w/m2 at a distance of 12m:
Formula: ![I\frac{P}{4\pi r^{2} }](https://tex.z-dn.net/?f=I%5Cfrac%7BP%7D%7B4%5Cpi%20r%5E%7B2%7D%20%7D)
I=1.6x10-3 w/m2
r=12m
![I\frac{P}{4\pi r^{2} }](https://tex.z-dn.net/?f=I%5Cfrac%7BP%7D%7B4%5Cpi%20r%5E%7B2%7D%20%7D)
![P=I4\pi r^{2}](https://tex.z-dn.net/?f=P%3DI4%5Cpi%20r%5E%7B2%7D)
![=(1.6x10-3\frac{W}{m^{2} } ) (4\pi (12m)^{2} )](https://tex.z-dn.net/?f=%3D%281.6x10-3%5Cfrac%7BW%7D%7Bm%5E%7B2%7D%20%7D%20%29%20%284%5Cpi%20%2812m%29%5E%7B2%7D%20%29)
![=2.89watts.](https://tex.z-dn.net/?f=%3D2.89watts.)
To learn more about sound intensity, refer to:
brainly.com/question/17062836
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