1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Blababa [14]
3 years ago
10

A disadvantage of hydroelectric power is _____.

Physics
2 answers:
julsineya [31]3 years ago
8 0
It can impact the waters by polluting it and impact fish life's and if we have a drought we can't use this power source 
oksian1 [2.3K]3 years ago
4 0
Hydropower<span> doesn't pollute the air like </span>power<span> plants that burn fossil fuels, such as coal or natural gas. </span>Hydropower is<span> a domestic source of energy, produced in the United States. </span>Hydropower<span> relies on the water cycle, which is driven by the sun, thus it's a renewable </span>power<span>source.</span>
You might be interested in
In most electric generators, either the armature (the coil of wire) or the magnetic
sukhopar [10]

Answer: C. rotated , inducted current C. rotated , inducted current

Explanation  let me know if im wrong

3 0
3 years ago
What are the formulas for Work, KE, GPE and Power?
Katyanochek1 [597]

Answer:

work=f×d

GPE =m×g×h

kinetic energy =  \frac{1}{2} mv {}^{2}  \\ power =  \frac{w}{t}

6 0
3 years ago
A 3" diameter germanium wafer that is 0.020" thick at 300K has 1.015 x 10^17 As atoms added to it. What is the resistivity of th
Ber [7]

Answer:

0.546 ohm / μm

Explanation:

Given that :

N = 1.015 * 10^17

Electron mobility, u = 3900

Hole mobility, h = 1900

Ng = 4.42 x10^22

q = 1.6*10^-19

Resistivity = 1/qNu

Resistivsity (R) = 1/(1.6*10^-19 * 1.015 * 10^17 * 3900)

= 0.01578880889 ohm /cm

Resistivity of germanium :

R = 1 / 2q * sqrt(Ng) * sqrt(u*h)

R = 1 / 2 * 1.6*10^-19 * sqrt(4.42 x10^22) * sqrt(3900*1900)

R = 1 /0.0001831

R = 5461.4964 ohm /cm

5461.4964 / 10000

0.546 ohm / μm

7 0
3 years ago
The diagram shows the flow of water through a hydroelectric power station. The falling water
KonstantinChe [14]

Answer:

KE = \frac{1}{2} mv^{2}

Explanation:

In the generation of energy from hydroelectric power station, the motion of water, and the turbines are paramount. The falling flowing water turns the blades of the turbine, which in-turn causes the movement of a coil within a strong magnetic field.

The motion of the coil which cuts the strong magnetic field induces current. Thus, the system generates electrical energy.

The equation that links kinetic energy (KE), mass (m) and speed (v) can be expressed as:

KE = \frac{1}{2} mv^{2}

7 0
3 years ago
1. A listener stands 20.0 m from a speaker that pumps out music with a power output of 100.0 W.
marta [7]

(1.a) The surface area being vibrated by the time the sound reaches the listener is 5,026.55 m².

(1.b) The intensity of the sound wave as it reaches the person listening is 0.02 W/m².

(1.c) The relative intensity of the sound as heard by the listener is 103 dB.

(2.a) The speed of sound if the air temperature is 15⁰C is 340.3 m/s.

(2.b) The frequency of the sound heard by the suspect is 614.3 Hz.

<h3>Surface area being vibrated</h3>

The surface area being vibrated by the time the sound reaches the listener is calculated as follows;

A = 4πr²

A = 4π x (20)²

A = 5,026.55 m²

<h3>Intensity of the sound</h3>

The intensity of the sound is calculated as follows;

I = P/A

I = (100) / (5,026.55)

I = 0.02 W/m²

<h3>Relative intensity of the sound</h3>

B = 10log(\frac{I}{I_0} )\\\\B = 10 \times log(\frac{0.02}{10^{-12}} )\\\\B = 103 \ dB

<h3>Speed of sound at the given temperature</h3>

v= 331.3\sqrt{1 + \frac{T}{273} } \\\\v = 331.3\sqrt{1 + \frac{15}{273} } \\\\v = 340.3 \ m/s

<h3>Frequency of the sound</h3>

The frequency of the sound heard is determined by applying Doppler effect.

f_o = f_s(\frac{v \pm v_0}{v \pm v_s} )

where;

  • -v₀ is velocity of the observer moving away from the source
  • -vs is the velocity of the source moving towards the observer
  • fs is the source frequency
  • fo is the observed frequency
  • v is speed of sound

f_0 = f_s(\frac{v-v_0}{v- v_s} )

f_0 = 512(\frac{340.3 - 10}{340.3 - 65} )\\\\f_0 = 614.3 \ Hz

Learn more about intensity of sound here: brainly.com/question/17062836

3 0
2 years ago
Other questions:
  • A 12 kg bowling ball would require what force to accelerate down and alleyway at a rate of 3 m/s²?
    7·1 answer
  • The following 1h nmr absorptions were obtained on a spectrometer operating at 200 mhz and are given in hz downfield from tms. Co
    15·1 answer
  • A car radio draws 0.18 A of current in the autos 12-V electrical system. (a) How much electric power does the radio use?
    14·1 answer
  • The amount of a good or service a
    10·1 answer
  • A farsighted woman breaks her current eyeglasses and is using an old pair whose refractive power is 1.570 diopters. Since these
    12·1 answer
  • Consider a portion of a cell membrane that has a thickness of 7.50nm and 1.3 micrometers x 1.3 micrometers in area. A measuremen
    15·1 answer
  • What do you mean by negative acceleration? can an accelerating automobile starting from rest have a negative acceleration
    13·1 answer
  • An elite Tour de France cyclist can maintain an output power of 470 W during a sustained climb. Part A At this output power, how
    6·1 answer
  • True or false Are African Grey birds smart .
    6·2 answers
  • 3. An atom has 11 protons in the nucleus. What is the atomic number? What is the name of this
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!