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3 years ago

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A student is watching waves come in from the ocean. He noticed that the first wave he saw (Wave A) had twice the amplitude of th

e second wave he saw (Wave B).
Which wave, A or B, had the most energy? Explain

1 answer:

Alika [10]3 years ago

8 0

Answer:

Wave A

<em>I</em><em> </em><em>hope this</em><em> </em><em>helps</em><em> </em>

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A person standing 1.20 m from a portable speaker hears its sound at an intensity of 5.50 ✕ 10−3 W/m2. HINT (a) Find the correspo

iris [78.8K]

Answer:

PART A)

L = 97.4 dB

PART B)

$I = 6.11 \times 10^{-6} W/m^2$

PART C)

L = 67.9 dB

Explanation:

PART A)

level of sound is given as

$L = 10 Log\frac{I}{I_o}$

now we have

$L = 10 Log\frac{5.50\times 10^{-3}}{10^{-12}}$

$L = 97.4 dB$

PART B)

Since source is a spherical source

so here the intensity of sound is inversely depends on the square of the distance from the source

$\frac{I_2}{I_1} = \frac{r_1^2}{r_2^2}$

$\frac{I_2}{5.50 \times 10^-3} = \frac{1.20^2}{36^2}$

$I_2 = 6.11 \times 10^{-6} W/m^2$

PART C)

level of sound is given as

$L = 10 Log\frac{I}{I_o}$

now we have

$L = 10 Log\frac{6.11\times 10^{-6}}{10^{-12}}$

$L = 67.9 dB$

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3 years ago

A trooper is moving due south along the freeway at a speed of 23 m/s. at time t = 0, a red car passes the trooper. the red car m

Deffense [45]

The answer choice is 23

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4 years ago

A wave raises a buoy twice every second and the crests of the incoming waves are 4m apart

Elis [28]

Answer:

1) T = 0.5 s

2) f = 2 Hz

Explanation:

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3 years ago

What type of energy is related to kinetic energy of all the particles in a sample of matter

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The kinetic molecular theory of matter offers a description of the microscopic properties of atoms (or molecules) and their interactions, leading to observable macroscopic properties (such as pressure, volume, temperature). An application of the theory is that it helps to explain why matter exists in different phases (solid, liquid, and gas) and how matter can change from one phase to the next.

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3 years ago

Positions B and D are 11.3 meters and 1.9 meters above the playing field, respectively. If the ball had a speed of 6.2 m/s in po

Andreyy89

Answer:

Speed of the ball in position D $=14.92 \frac{m}{s}$

<u>Explanation:</u>

Given:

Position of B=11.3 $\text { meters }$

Position of D=1.9 $\text { meters }$

Velocity of B=6.2 $\text { meters }$

To Find:

Velocity of D

Solution:

According to the formula, Velocity is given as

$V d=\sqrt{\left[V b^{2}+(2 \times g \times d y)\right]}$

$V b$ =Velocity of B

$V d$ =Velocity of D

g=acceleration due to gravity=9.8 m/s^2

$d y$ =Change in position of B and D

Substitute the all values in the above equation we get

$d y=11.3-1.9$

$V d=\sqrt{\left[6.2^{2}+(2 \times 9.8 \times(11.3-1.9))\right]}$

$=\sqrt{[38.44+(2 \times 9.8 \times(9.4))]}$

$=\sqrt{[38.44+(19.6 \times 9.4)]}$

$=\sqrt{38.44+186.24}$

$=\sqrt{222.68}$

$=14.92 \frac{m}{s}$

Result :

The velocity of D is $=14.92 \frac{m}{s}$

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3 years ago