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3 years ago

Which variable is changed in an experiment?

Physics

1 answer:

Shtirlitz [24]3 years ago

3 0

C. The Independent variable

It is the variable that you manipulate, while dependent is the response.

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The noise from a power mower was measured at 104 dB. The noise level at a rock concert was measured at 121 dB. Find the ratio of

UkoKoshka [18]

Based on the calculations, the ratio of the intensity of Ir to Ip is equal to 50.12.

<h3>How to find the ratio of the intensity?</h3>

Let the intensity of the power mower be Ip.

Let the intensity of the rock music be Ir.

Mathematically, sound intensity level can be calculated by using this formula:

$\beta = 10 log(\frac{I}{I_{ref}} )$

<u>Where:</u>

I is the intensity of the sound.

Making I the subject of formula, we have:

I = Io × $10^{\frac{\beta }{10} }$

For Ip, we have:

Ip = Io × $10^{\frac{104 }{10} }$

Ip = Io × $10^{10.4}$

For Ir, we have:

Ir = Io × $10^{\frac{121 }{10} }$

Ir = Io × $10^{12.1}$

Now, we can find the ratio of the intensity:

Ir/Ip = Io × $10^{12.1}$ /Io × $10^{10.4}$

Ir/Ip = $10^{12.1}$ / $10^{10.4}$

Ir/Ip = $10^{12.1 -10.4}$

Ir/Ip = $10^{1.7}$

Ir/Ip = 50.12.

Read more on sound intensity here: brainly.com/question/17062836

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8 0

2 years ago

Do ocean currents affect aquatic life? What do you think and why?

4vir4ik [10]

Answer: By moving heat from the equator toward the poles, ocean currents play an important role in controlling the climate. Ocean currents are also critically important to sea life.

Explanation: Plzz mark me as brainliest !!

4 0

3 years ago

A crazy dog runs at a constant speed of 19.85 mi/hr for 6.09 min. How far does the dog travel during this time period?

Phantasy [73]

Answer:

Distance, d = 3242.19 meters

Explanation:

It is given that,

Speed of the dog, v = 19.85 mi/hr

Since, 1 mph = 0.44704 m/s

v = 19.85 mi/hr = 8.873 m/s

Time taken by the dog, t = 6.09 min = 365.4 sec

Let the distance covered by the dog during this time period is d. It can be calculated by the speed of the dog multiplied by the time taken as :

$d=v\times t$

$d=8.873\times 365.4$

d = 3242.19 meters

So, the the dog travel during this time period is 3242.19 meters. Hence, this is the required solution.

8 0

3 years ago

Momentum is what combination of variables?

BigorU [14]

p=mv

where p=momentum, m=mass and v=velocity.

Hence momentum is the combination of mass and velocity.

Hope this helps you!

8 0

3 years ago

Three resistors with the values of R_1, R_2, and R_3 are connected in parallel. Which of the following expresses the total resis

bagirrra123 [75]

Answer: Option d.)

R_eq = (1/R_1 + 1/R_2 + 1/R_3)^-1

Explanation:

Since, there are three resistors connected in parallel, the reciprocal of the total resistance of the resistor combination (R_eq) is obtained by adding the reciprocal of each resistance.

i.e 1/R_eq = (1/R_1 + 1/R_2 + 1/R_3)

So, R_eq = (1/R_1 + 1/R_2 + 1/R_3)^-1

Thus, the total resistance (R_eq) is equal to the inverse of the sum of the reciprocal of each resistance.

3 0

4 years ago