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3 years ago

11

In the United States, most of our energy comes from this non-renewable resource, which has a negative effect on the environment.

(2 points)
coal
nuclear
natural gas
petroleum

2 answers:

AVprozaik [17]3 years ago

7 0

Answer:

Coal

Explanation:

I took the test.

spin [16.1K]3 years ago

4 0

The best answer among the following choices would be the first option A) Coal.

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A ball tied on a string rotates in a circular path as shown above. The only forces acting on the ball at any point are the weigh

Harlamova29_29 [7]

Answer:

the third one T-W

Explanation:

the direction of the Tension and weight are opposite

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3 years ago

What is the difference in force of a car and a tractor

vodka [1.7K]

Answer:

See a tractor is more slow but has a greater force and a car is fast but has a slower force

Explanation:

so your answer is Tractors have more force then cars

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3 years ago

Yeast breaking down starch into usable energy ____________ law of thermodynamics.

Anon25 [30]

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3 years ago

Read 2 more answers

The human ear canal is about 2.3 cm long. If it is regarded as a tube open at one end and closed at the eardrum, what is the fun

mariarad [96]

Answer:

For the given conditions the fundamental frequency is 3728.26 Hertz

Explanation:

We know that for a pipe open at one end and closed at other end the fundamental frequency is given by

$f=\frac{V_{s}}{4L}$

where

f is the fundamental frequency

$V_{s}$ is the speed of sound in air in the surrounding conditions.

L = Length of the pipe

Applying values we get and using speed of sound as 343m/s we get

$f=\frac{343}{4\times 2.3\times 10^{-2}}=3728.26Hz$

7 0

3 years ago

3. The velocity of sound is 332 m/s. Answer the following questions:

Angelina_Jolie [31]

Answer:

20 Hz, 20000 Hz

0.0166 m, 16.6 m

Explanation:

The minimum frequency that a human ear can hear is 20 Hz

The maximum frequency that a human ear can hear is 20000 Hz.

v = Velocity of sound = 332 m/s

Wavelength is given by

$\lambda=\dfrac{v}{f}\\\Rightarrow \lambda=\dfrac{332}{20}\\\Rightarrow \lambda=16.6\ \text{m}$

The longest wavelength that can be heard by the human ear is 16.6 m

$\lambda=\dfrac{332}{20000}\\\Rightarrow \lambda=0.0166\ \text{m}$

The shortest wavelength that can be heard by the human ear is 0.0166 m.

3 0

2 years ago