Which statement accurately describes quantum mechanics and nanotechnology?

Which describes how a turbine works to produce energy for electricity? A. Energy from various energy sources, such as wind or fr

OLEGan [10]

The answer is A. Energy from various energy sources, such as wind or from burning fossil fuels, is used to spin the blades of the turbine. The turbine then powers a generator, which produces electricity.

Works on simple principle of the turbine blades translation of energy sources causing the mechanical spin of the blades which is connected to a rotor which spins the main shaft of generator thus producing electricity.

5 0

3 years ago

You have been offered an admission to a senior high school to persue a programme you like. Write a letter to the headteacher of

Anna [14]

Answer:

Find the letter below.

Explanation:

1237 Richmond Avenue,

Houston, Texas,

U.S.A.

3rd May, 2021.

The Principal,

Carnegie Vanguard High School,

Houston, Texas,

U.S.A.

Dear Sir,

APPRECIATION FOR THE ADMISSION OFFER IN YOUR SCHOOL

I humbly write this letter to express my sincere appreciation for the offer of admission in your highly esteemed institution of learning. The admission letter states that I was admitted to pursue a programme in Computer Science and this is a source of great delight for me. The opportunity is a unique one because I stand a great chance of acquiring deeper knowledge of programming software that will prove invaluable to me in my future career.

Over the years, I have been particularly thrilled with all the inventions that have been made possible with information technology and programming of many useful software. These inventions have made life a lot easier, hence my interest in getting the required knowledge that will enable me to contribute my quota to the society.

This programme will also afford me the opportunity to relate with seasoned professionals in the field of Information Technology. When in contact with these professionals, I hope to ask them several questions on programming, the technicalities involved in it, and what is obtainable in the real-world scenario. Armed with these pieces of information, I believe that the programme will shape me to be an excellent professional that will be useful to the society.

Once again, thank you for this very special opportunity. I hope to fully maximize the privilege.

Yours Sincerely,

Jessica Liam.

5 0

3 years ago

Why do sound waves move faster through the ground than through the air? A. Particles of matter are packed more loosely in the gr

Fittoniya [83]

Answer:

A

Explanation:

5 0

4 years ago

A certain siren radiates sound uniformly in all directions. At a distance of 17 m from the siren, the intensity level is 49 db.

AveGali [126]

Answer:

The power is $P = 2.88*10^{-4 } \ W$

Explanation:

From the question we are told that

The distance from the siren is $d = 17 \ m$

The intensity level is $\beta = 49\ dB$

The threshold of hearing is $I_0 = 1.0 *10^{-12} \ W/m^2$

Generally the intensity level is mathematically represented as

$\beta = 10dB * log [\frac{I}{I_o} ]$

Where I is the intensity at which the siren radiates the sound

substituting values

$49 = 10 * log [\frac{I}{1.0 *10^{-12}} ]$

=> $I = 7.94*10^{-8} W/m^2$

Now the amount of power the siren put out is mathematically evaluated as

$P= IA$

Where A is the area of the siren which is taken as a sphere and it is mathematically evaluated as

$A = 4 \pi d^2$

So

$P = I * 4 \pi d^2$

substituting values

$P = 7.94 *10^{-8} * 4 * 3.142 * (17)^2$

$P = 2.88*10^{-4 } \ W$

3 0

3 years ago

Which situations might cause two observers (A and B) to measure different frequencies for the same vibrating object? Select the

Alex787 [66]

We want to explain why two different observes may measure different frequencies for the same vibrating object.

We will see that the two correct options are:

Observer A is stationary and Observer B is moving.
Observer A and Observer B are moving at different speeds relative to each other.

Let's assume that the vibrating object is a guitar string. Thus, the string makes a noise, and from that noise, we can estimate the frequency at which the string vibrates.

Now there appears a really cool effect, called the Doppler Effect. It says that the apparent change of frequency is due to the motion of the observer or the source of the frequency (or both).

For example, if you move towards the vibrating string, the perceived frequency will be larger, and you will hear a "higher" sound.

While if you move away from the string, the opposite happens, and you will hear a "lower" sound.

Then the only thing that impacts in how we perceive the frequency is our velocity relative to the source.

So, why do observers A and B measure different frequencies?

The two correct answers are:

Observer A is stationary and Observer B is moving.
Observer A and Observer B are moving at different speeds relative to each other.

If you want to learn more, you can read:

brainly.com/question/17107808

6 0

3 years ago