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Vadim26 [7]
3 years ago
15

11. Which of the following phenomena is taking place when sound waves are reflected from a surface along parallel lines? A. Refr

acting B. Absorption C. Focusing D. Diffusion
Physics
1 answer:
allsm [11]3 years ago
4 0
The Answer is C. Focusing             
You might be interested in
Think of an example of a chemical change that some people might think is NOT a chemical change. Explain why it is.​
AlekseyPX

Answer:

Digesting food

Explanation:

I have people who think that its not true but it is

Hope this helped

7 0
3 years ago
What state of matter is it that it starts at a liquid then loses energy during the change of state
miv72 [106K]
Well, if the substance started as a liquid, lost energy, and changed state, then it's in the SOLID state right now.
4 0
3 years ago
What is the strength of an electric field that will balance the weight of a 3.3 g plastic sphere that has been charged to -7.6 n
sp2606 [1]

As the plastic sphere is charged, therefore it experience an electric force when placed in an electric fields and also experiences gravitational force acts downward so the electric force must act upward.

Let  F_{E} is electric force and F_{G} is gravitational force.

If these forces are balanced, thereforeF_{E} = F_{G}

or                                                                      \left | q \right |E=mg\\\\\ E=\frac{mg}{\left | q \right |}

Given, q=-7.6 nC=-7.6\times10^{-9} C and  m=3.3 g= 3.3\times10^{-3} kg.

Substituting these values in above equation we get,

E=\frac{3.3\times10^{-3} kg\times9.8 m/s^{2} }{7.6\times10^{-9} C}\\\\E=4.2\times10^{6} N/C

Thus, the magnitude of electric field is 4.2\times10^{6} N/C.

As the charge is negative, the electric field at the location of the plastic sphere must be pointing downward.



8 0
3 years ago
plz tell fast oktwo paragraphs describing the advantages and disadvantages of living in the town.plz tell​
mars1129 [50]

Answer:

There are advantages and disadvantages to living in a small town. You are likely to have more frequent contact with neighbors in a small town than you would in a larger town or city, so it is important to take into account the pros and cons of having privacy. Also take into consideration other factors, including your plans for a family, the career opportunities, your finances, the schools and entertainment options. Your personality will determine whether a small town offers advantages or disadvantages.

Privacy

Many people who reside in small towns enjoy the closeness of knowing their neighbors and the details of neighbors' lives. If a baby is born, a child is ill or a relative dies, people in small towns often want to know about it and be there for you. This can be an advantage, especially if you are lacking a family of your own or enjoy a great deal of socializing. However, if you would rather keep the details of your life to yourself and turn your nose up at idle gossip, small town living might not be for you.

Finances

Jobs can be hard to come by in small towns. You might be required to commute out of town to work but then return to a peaceful environment at the end of a busy day. Housing might be cheaper in small towns, although commuting costs might be higher. Food and child care expenses might be reduced as people are more likely to have gardens and share produce or take turns watching each other's children.

Recreation

One of the disadvantages of a small town is not being close to amusement parks, zoos or museums. However, people in small towns tend to come together during town picnics, festivals or fairs. Depending on your preferences, small towns might provide a relaxed, slower pace when it comes to entertainment compared to the hustle and bustle of a city, where there is constant movement, commotion and entertainment at every corner.

Schools

In a small town, class sizes are usually smaller and teachers and students can get to know each other and their fellow classmates on a deeper level. Many small towns have schools that receive national academic awards or are the highest achieving district in their states. CNN Money ranked Louisville, Colorado as the number one small town in America in 2011 and the school system is academically ranked among the top three in the Denver area. However, some of these towns noted high taxes as a trade-off for the outstanding school systems.

Explanation:

3 0
3 years ago
A generator connected to an RLC circuit has an rms voltage of 140 V and an rms current of 31 mA. Part A
vredina [299]

Answer:

53.06 ohm

Explanation:

We have given the rms voltage V =140 V

And the rms current i=31 mA

So the impedance Z=\frac{V}{i}=\frac{140}{3\times 10^{-3}}=46.666kohm

Resistance is given as R = 3 kohm

And capacitive reactance X_C=6.5kohm

We know that Z=\sqrt{R^2+(X_L-X_C)^2}

46.666=\sqrt{3^2+(X_L-6.5)^2}

Squaring both side 2177.1556=9+(X_L-6.5)^2

(X_L-6.5)^2=2168.155

(X_L-6.5)=46.5634

X_L=53.063ohm

8 0
3 years ago
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