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alexdok [17]
2 years ago
13

Elephants can communicate over distances as far as 6 km by using very low-frequency sound waves. What is the wavelength of a 10

Hz sound wave emitted by an elephant? Assume air temperature is 20∘C.
Physics
1 answer:
harkovskaia [24]2 years ago
3 0

The characteristics of the sound waves allow to find the result for the wavelength is:

         λ = 34.29 m

The sound wave is a longitudinal traveling wave, where the speed of the wave depends on the air temperature.

         v = v_o \sqrt{1 + \frac{T}{273} }  

where v₀ is the speed of sound for T = 0ºc v₀ = 331 m / s.

indicate that the temperature is T = 20ºC, let's find the speed of the traveling wave.

        v = 331 \sqrt{1 + \frac{20}{273} }  

        v = 342.9 m / s

The speed of sound is related to wavelength and frequency.

       v = λ f

        λ = \frac{v}{f}

Let's calculate

        \lambda = \frac{342.29}{10}  

        λ  = 34.29 m

In conclusion using the characteristics of sound waves we can find the result for the wavelength is:

          λ = 34.29 m

Learn more here:  brainly.com/question/21995826

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To solve this problem we will apply the concept of magnification, which is given as the relationship between the focal length of the eyepieces and the focal length of the objective. This relationship can be expressed mathematically as,

\mu = \frac{f_0}{f_e}

Here,

\mu = Magnification

f_e = Focal length eyepieces

f_0 = Focal length of the Objective

Rearranging to find the focal length of the objective

f_0 = \mu f_e

Replacing with our values

f_0 = 7.5* 3.7cm

f_0 = 27.75cm

Therefore the focal length of th eobjective lenses is 27.75cm

5 0
3 years ago
Desperado, a roller coaster built in Nevada, has a mass of 800 kg. It also has a vertical drop of 225 feet down the first hill.
weeeeeb [17]

Answer:

the work done by friction on the car is 524,582 J.

Explanation:

Given;

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The time taken for the coaster to drop down the hill is calculated as;

t = \sqrt{\frac{2h}{g} } \\\\t = \sqrt{\frac{2\ \times \ 68.58}{9.8} } \\\\t = 3.74 \ s

The work done by friction on the car is calculated as;

W =F\ \times \ d = \frac{mv}{t} \times \ d\\\\W = \frac{800 \ \times \ 35.76  }{3.74} \times \ 68.58\\\\W = 524,582 \ J

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Answer: 329.28 m/s

Explanation:

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The speed of traveling sound = ?

Speed is obtained by dividing the distance travelled by the time taken for the travel.

Speed = Distance / time

Speed = 823.2m/2.5 seconds

Speed = 329.28 m/s

Thus, the sound traveling as fast as 329.28 m/s

8 0
3 years ago
A rectangular loop of wire with width 0.4 cm and length 0.4 cm is oriented with the normal to the face of the loop making an ang
svetoff [14.1K]

Answer:

0.001067 Wb

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