By what amount does the sound intensity decrease when the distance to the source doubles?

Answer:

t = 45.5 million years

Explanation:

Initially whole sample is consisting the radioisotope

so initial total mass will be

[tex]m_0 = 16.75 g + 50.25 g[/tex]

[tex]m_0 = 67 g[/tex]

now after some time we can say the radioactive nuclei is of mass

[tex]m = 16.75 g[/tex]

now we also know that half life is 23 million years

so we have

[tex]m = m_0 e^{-\lambda t}[/tex]

now we have

[tex]16.75 = 67e^{-\lambda t}[/tex]

[tex]0.254 = e^{-\lambda t}[/tex]

[tex]\lambda t = 1.37[/tex]

[tex]\frac{ln 2}{23 million \:years} t = 1.37[/tex]

t = 45.5 million years

so above is the time interval

The spring constant of the combination can be calculated using the formula: k_comb = (k1 + k2 + k3) / L, where k1, k2, and k3 are the spring constants of the individual springs, and L is the length of the combined spring.

The spring constant of the combination can be calculated using the formula:

kcomb = (k1 + k2 + k3) / L

Where k1, k2, and k3 are the spring constants of the individual springs, and L is the length of the combined spring. In this case, since the combined spring is three times the length of one of the original springs, L = 3L1. Substituting this value into the formula gives:

kcomb = (k1 + k2 + k3) / 3L1

The acceleration of a 300,000-kg jumbo jet with a thrust force of 120,000 N is calculated using Newton's second law of motion to be 0.4 m/s².

The student has asked a Physics question related to calculating the acceleration of an object given its mass and the force applied to it. The subject of this question falls under Newton's second law of motion, which states that the acceleration (a) of an object is directly proportional to the net force (F) acting on it and inversely proportional to its mass (m), which can be represented by the equation a = F / m.

In the case of the jumbo jet with a mass of 300,000 kg experiencing a thrust force of 120,000 N, we can find the acceleration of the jet by using Newton's second law:

a = F / m = 120,000 N / 300,000 kg = 0.4 m/s²

The acceleration of the jumbo jet is 0.4 m/s² just before takeoff.

Since it follows a simple harmonic motion then the displacement of the oscillator follows the expression: x (t) = A cos (ω t + δ)

Then this gives that the formula for maximum acceleration is:

a = amax = A w^2

Where,

A = maximum amplitude of the wave

w = angular velocity

We also know that w is equivalent to: w = 2 π f

Therefore combining all and using the Newton’s 2nd law of motion:

F = m a

F = m A w^2

F = m A (2 π f)^2

A = F / m (2 π f)^2

Plugging in the given numbers:

A = 40,000 N / [(10^−4 kg) (2 π * 10^6 / s)^2]

A = 1.0132 * 10^-5 m

or simplifying

The intensity of the sound is [tex]\( 10^{-3.6} \, \text{W/m}^2 \)[/tex].

Step 1

To find the intensity (I) of a sound given its intensity level (L), we can use the formula:

[tex]\[ L = 10 \cdot \log_{10}\left(\frac{I}{I_0}\right) \][/tex]

Where:

- L is the intensity level in decibels (dB)

- I is the intensity of the sound

- [tex]\( I_0 \)[/tex] is the reference intensity (usually the threshold of hearing, which is [tex]\( 10^{-12} \) W/m²)[/tex]

Step 2

Given that the intensity level L is 84 dB and [tex]\( I_0 = 10^{-12} \)[/tex] W/m², we can rearrange the formula to solve for I:

[tex]\[ 84 = 10 \cdot \log_{10}\left(\frac{I}{10^{-12}}\right) \][/tex]

Dividing both sides by 10:

[tex]\[ 8.4 = \log_{10}\left(\frac{I}{10^{-12}}\right) \][/tex]

Step 3

Now, we can raise both sides as powers of 10:

[tex]\[ 10^{8.4} = \frac{I}{10^{-12}} \]\[ 10^{8.4} \times 10^{-12} = I \]\[ I = 10^{8.4 - 12} \]\[ I = 10^{-3.6} \, \text{W/m}^2 \][/tex]

So, the intensity of the sound is [tex]\( 10^{-3.6} \, \text{W/m}^2 \)[/tex].

Complete correct question:

What is the intensity of a sound with a measured intensity level of 84 dB?(Iσ=[tex]10^-^1^2 Watt/m^2[/tex])

The charge on each sphere is approximately 3.45 × 10⁻⁹ C.

In order to determine the charge on each sphere, we can use Coulomb's law, which states that the force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

Given that the repulsive force between the spheres is 0.220 N when they are 15 cm apart, we can use this information to calculate the charge on each sphere.

Using Coulomb's law, we have:

F = k * (q1 * q2) / r²

where F is the force, k is the electrostatic constant, q1 and q2 are the charges on the spheres, and r is the distance between them.

Since the charges on the spheres are equal in magnitude, we can rewrite the equation as:

F = k * (q²) / r²

Solving for q:

q = sqrt((F * r) / k)

Substituting the given values:

q = sqrt((0.220 N * (0.15 m)²) / (9 × 10⁹ N m^2/C²))

q ≈ 3.45 × 10⁻⁹ C

Therefore, the charge on each sphere is approximately 3.45 × 10⁻⁹ C.

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So, during the day, the basic FVR weather minima required to takeoff from the Onawa, IA (K36) airport is 1 statute mile, clear of clouds.

Discussion: Onawa, IA, (K36) airport is enclosed by Class G airspace. There is 1 statute mile of visibility and clear of clouds in the VFR Weather minima in Class G Airspace below 1,200 feet AGL.

Answer A is wrong because Class E, D, and C are all 3 statute miles of visibility, 1,000 feet above the clouds, 500 feet below the clouds, and 2,000 feet horizontally from the clouds.

Answer B is also wrong since the a 0 visibility statute miles  has no VFR weather minima.

The basic VFR weather minima for takeoff during the day from an uncontrolled airspace such as Onawa, IA (K36), are 1 statute mile visibility and clear of clouds, in accordance with FAR 91.155. However, local or airport-specific regulations may impose more restrictive requirements, and pilot discretion is key.

The basic VFR weather minima required to takeoff from the Onawa, IA (K36) airport during the day for a pilot are dictated by the Federal Aviation Regulations (FARs), particularly FAR 91.155. For an aircraft operating in uncontrolled airspace, which typically applies to smaller airports like Onawa, IA (K36) that may not have a control tower, the minimum requirements are 1 statute mile visibility and clear of clouds. However, these can be superseded by more restrictive state, local, or airport-specific regulations. It's also crucial to acknowledge that pilot discretion and having a clear understanding of one's own limits and aircraft capabilities are essential when deciding to operate in any kind of weather.

This question, relating to non-uniform charge distribution in a spherically symmetric manner, involves the concepts of Gaussian surfaces and charge distribution symmetry. Apply Gauss's law to solve it, we need to integrate the charge density function over the volume enclosed by the Gaussian surface. The concept of the spherical shell is crucial in the calculation of charges enclosed within the Gaussian surface.

The situation regarding the nonuniform, but spherically symmetric, distribution of charge is a problem that often comes up in physics. In this situation, there are several important concepts to understand. One of the main concepts is that of a Gaussian surface, which is an imaginary surface we define in order to apply Gauss's law.

Given that the charge density (ρ(r)) varies with r, the r here denotes the respective radius of the Gaussian surface being considered, and the use of the infinitesimal spherical shell helps facilitate calculation of the enclosed charges. To solve this, we would need to integrate the charge density function over the volume enclosed by the Gaussian surface to get the total enclosed charge.

Another key term to understand is spherical symmetry with non-uniform charge distribution. A charge distribution has spherical symmetry if the density of charge depends only on the distance from a point in space and does not depend on direction. Thus, even though the distribution of charges is non-uniform, as long as it only depends on the radial distance and not the direction, the charge distribution is deemed as spherically symmetrical.

When considering points outside the charge distribution, the additional volume does not contribute to the total enclosed charge, indicating the importance of the spherical shell concept that allows one to focus on the relevant range, which depends on whether the field point is inside or outside the charge distribution.

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A line that describes volume across the surface of an object or shape is called an "equidistant" line.

The line that describes volume across the surface of an object or shape is termed as an "equidistant" line.

In geometry, equidistant lines are those that have the same distance from a given point or a set of points. When considering volume across the surface of an object or shape, equidistant lines represent contours or lines of constant volume.

These equidistant lines are typically drawn parallel to each other, maintaining a consistent distance from each other across the surface of the object or shape. By connecting points on these equidistant lines, one can create contour lines or isopleths that depict variations in volume across the surface.

For example, in a topographic map, equidistant lines represent contours of constant elevation, indicating points of equal height above a reference point such as sea level.

In engineering and design, equidistant lines are essential for visualizing and understanding volume distributions within objects or shapes. They are also utilized in various fields such as geography, geology, and fluid dynamics to analyze and interpret spatial data and phenomena.

Answer: D. The characteristics of the mixture change within a sample.

Explanation: Homogeneous mixture are those mixtures in which dispersed phase is uniformly distributed throughout the dispersion medium and thus the composition is same throughout. There is no physical distinction between the dispersed phase and dispersion medium. Example: Salt in water

Heterogeneous mixture are those mixtures in which dispersed phase is not uniformly distributed throughout the dispersion medium and thus the composition is not same throughout .There is a physical distinction between the dispersed phase and dispersion medium. Example : Oil in water

To find the speed at which a wave travels on a 2.0-meter long piano string of mass 10 g under a tension of 338 N, use the formula v = √(FT/μ), which results in a speed of approximately 260.4 m/s.

The speed of a wave on a string under tension can be determined using the equation v = √(FT/μ), where v is the wave speed, FT is the force of tension, and μ is the linear mass density of the string.

In this scenario, we know the string tension (FT) is 338 N, and we can easily compute the linear density (μ) by taking the total mass of the string (10 g or 0.01 kg) and dividing it by its length (2.0 m), giving us 0.005 kg/m.

Substituting these values into the equation, the wave speed (v) on this piano string would be v = √(338 / 0.005) that is approximately 260.4 m/s.

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(A)  Gamma rays

Focussing is a process in which a beam of light is passed and concentrated on the particular point.

Gamma rays are the type of elecromagnetic radiation that cannot of focused. Gamma rays has high frequency and also are quite energetic due to which when the beam of light is passed through it, it becomes too difficult to focus on a particular point as they interacts strongly with the matter and destroys itself. Hence, Gamma rays are not easily focused.

The maximum velocity of a simple harmonic oscillator is equal to the amplitude of the motion multiplied by the angular frequency. The angular frequency is defined as 2pi divided by the period of the oscillator. To calculate the maximum velocity, you can use the equation Vmax = A * w = A * 2pi/T.

The maximum velocity of a simple harmonic oscillator occurs when the object is at the equilibrium position, where the displacement is zero. In this case, the equation for displacement is given by x(t) = 0.5m * cos(pi/3t), where t is in seconds. The maximum velocity is equal to the amplitude of the motion, A, multiplied by the angular frequency, w.

The angular frequency is given by w = 2pi/T, where T is the period of the oscillator. The period, T, can be determined by finding the time it takes for the object to complete one full oscillation. The period is the reciprocal of the frequency, f, which is given by f = 1/T.

So the maximum velocity, Vmax, can be calculated as Vmax = A * w = A * 2pi/T.

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1 slug = 32 lb 

f = kx 
32 = k(2) 
k = 16 

c = 8 ( 8 times the instantaneous velocity) 

mx'' + cx' + kx = 8sin4t 
x'' + 8x' + 16x = 8sin4t 

Find for the complimentary solution xh:
r² + 8r + 16 = 0 
r² + 4r + 4r + 16 = 0 
(r + 4)(r + 4) = 0 
r = -4, -4 (repeated roots) 
xh = c₁e^(-4t) + c₂te^(-4t) 

Find for the particular solution xp:
xp = Acos(4t) + Bsin(4t) 
xp' = -4Asin(4t) + 4Bcos(4t) 
xp'' = -16Acos(4t) - 16Bsin(4t) 
x'' + 8x' + 16x = 8sin(4t) 
-16Acos(4t) - 16Bsin(4t) + 8[ -4Asin(4t) + 4Bcos(4t) ] + 16 [ Acos(4t) + Bsin(4t) ] = 8sin(4t) 
-16Acos(4t) - 16Bsin(4t) - 32Asin(4t) + 32Bcos(4t) + 16Acos(4t) + 16Bsin(4t) ] = 8sin(4t) 
-32Asin(4t) + 32Bcos(4t) = 8sin(4t) 
-4Asin(4t) + 4Bcos(4t) = sin(4t) 

We group like terms and then solve for A and B:
4Bcos(4t) = 0 
B = 0 

-4Asin(4t) + 4Bcos(4t) = sin(4t) 
-4Asin(4t) = sin(4t) 
A = -¼ 

xp = Acos(4t) + Bsin(4t) 
xp = -¼cos(4t) + (0) sin(4t) 
xp = -¼cos(4t) 

The general solution is therefore: 
x(t) = xh + xp 
x(t) = c₁e^(-4t) + c₂te^(-4t) - ¼ cos(4t) 

at t = 0 it starts from rest that is initial velocity = 0 
x'(0) = 0 

at t = 0 it starts from equilibrium 
x(0) = 0 

x(t) = c₁e^(-4t) + c₂te^(-4t) - ¼cos(4t) 
0 = c₁ + c₂(0) - ¼cos(0) 
c₁ = ¼ 

x(t) = c₁e^(-4t) + c₂te^(-4t) - ¼cos(4t) 
x(t) =¼e^(-4t) + c₂te^(-4t) - ¼cos(4t) 
x '(t) = -e^(-4t) + [ -4c₂te^(-4t) + c₂e^(-4t) ] + sin(4t) 
x '(t) = -e^(-4t) - 4c₂te^(-4t) + c₂e^(-4t) + sin(4t) 

x'(0) = 0 
0 = -e^(0) - 4c₂(0) e^(0) + c₂e^(0) + sin(0) 
0 = -1 + c₂ + 
= -4c₁ - 4c₂(0) + c₂ 
0= -4(1/4) + c₂ 
c₂ = 1 

x(t) =¼e^(-4t) + c₂te^(-4t) - ¼cos(4t) 
x(t) =¼e^(-4t) + te^(-4t) - ¼cos(4t) 

divide miles by speed to get the time

500km/88km/hr = 5.68 hours

Answer : The time taken by the car will be 5.68 hours.

Explanation :

Speed : It is defined as the distance traveled by the object per unit time.

Formula used :

[tex]Speed=\frac{Distance}{Time}[/tex]

Given:

Speed of car = 88 km/hr

Distance covered = 500 km

Now put all the given values in the above formula, we get:

[tex]88km/hr=\frac{500km}{Time}[/tex]

[tex]Time=\frac{500km}{88km/hr}[/tex]

[tex]Time=5.68hr[/tex]

Therefore, the time taken by the car will be 5.68 hours.

The velocity of the ball at t = 1 second is 4 ft/sec.

In order to find the velocity at any given time t, we need to take the derivative of the position function y = 36t − 16t2. The derivative of this function is dy/dt = 36 - 32t. Plugging t = 1 into this derivative, we get dy/dt = 36 - 32 * 1 = 4 ft/sec. Therefore, the velocity of the ball at t = 1 sec is 4 ft/sec.

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The period of a pendulum on the Moon will be [tex]\sqrt6[/tex] times that of the period in earth.

Period of a Pendulum on the Moon

The period of a pendulum is given by the formula:

[tex]T = 2\pi\sqrt{(L/g)}[/tex]

where T is the period, L is the length of the pendulum, and g is the gravitational acceleration.

To find the new period on the Moon, we need to consider that the gravitational acceleration on the Moon is approximately g/6 compared to that on Earth.

On Earth, the period Tₑ is:

[tex]T_e = 2\pi\sqrt{(L/g)}[/tex]

On the Moon, the period Tₘ is:

[tex]T_m = 2\pi\sqrt{(L/(g/6))} = 2\pi \sqrt{(6L/g)}[/tex]

This simplifies to:

[tex]T_m = \sqrt6 \times 2\pi\sqrt{(L/g)} = \sqrt6 \times T_e[/tex]

If we approximate [tex]\sqrt6 = 2.45[/tex], then:

[tex]T_m = 2.45 \times T_e[/tex]

First, report this to your instructor. Small cuts should be cleaned and checked for broken glass. Bandages and dressings are available in the First-Aid Kit found in the laboratory. If bleeding is not stopping, apply pressure to the wound or affected area. Any treatment outside emergency first aid will be referred to the student infirmary. Severe emergencies will be referred to the Hospital emergency room.

Cars with crumple zones reduce injuries by increasing the time of impact during a collision, which decreases the forces on passengers.

A way to prevent injuries in a collision is to design cars with parts that can crumple or collapse, which help protect the passengers. The correct answer to how this helps is a. It reduces injury to the passengers by increasing the time of impact. In the event of an accident, a longer impact time means the force exerted on the car and its occupants is spread out over a longer period, resulting in less forceful impacts and thereby reducing injuries. Cars now come with features like airbags and dashboard padding which also serve to increase the time over which the force acts on occupants, reducing the forces they experience.

While 24-bit color offers over 16 million possible colors, there may be specific hues and saturations that cannot be perfectly represented due to limits in human perception, device capabilities, or the color gamut of RGB. However, it is generally enough to represent most colors in a photograph to the viewer's satisfaction.

The primary additive colors are red, green, and blue, and in the context of electronic displays and digital imaging, colors are generated by combining these three colors at varying intensities. A color photograph cannot be represented using full 24-bit color if it contains colors that are outside the range of those that can be mixed using the RGB color model. This could be due to limitations in the gamut (the complete subset of colors) of the RGB color space or due to specific brightness or saturation levels that cannot be achieved with the standard 24-bit color depth.

In a 24-bit color system, also known as true color, each primary color (red, green, blue) is allocated 8 bits of data allowing for 256 possible shades per color channel. The combination of all three channels results in over 16 million possible colors (256 x 256 x 256). However, certain hues, particularly those that are very saturated or outside the typical RGB color gamut, may not be perfectly represented even in a 24-bit color space, potentially due to human perception limits, device display capabilities or the aesthetic choice by the artist.

Nevertheless, it is important to note that for most practical purposes and the way human eyes perceive color, the range provided by 24-bit color is sufficient to accurately represent most of the colors in a color photograph to the satisfaction of viewers.

The speed obtained by the pilot is not accurate since it is measuring the rate of travel in the wind, true velocity is that compared to the ground. Therefore the speed of the wind is:

v wind = 165 - 145

v wind = 20 km/h

Therefore the wind velocity = 20 km/h against the plane.

The wind velocity affecting the plane relative to the observer is 310 km/h toward the north. This is determined by vector addition of air velocity of the plane relative to the plane and ground velocity of the plane relative to the observer.

To determine the velocity of the wind affecting the plane relative to the observer, we can use vector addition.

Given:

We need to find the wind velocity relative to the observer [tex]v_{wg}[/tex]. The relation can be expressed as:

[tex]v_{pg} = v_{ap} + v_{wg}[/tex]

Here, South and North are in opposite directions, so we can subtract these velocities and solve for vwg.

Let's assume south direction as negative and north as positive.

Calculation:

[tex]+145 km/h \text{(toward north)} = -165 km/h \text{(south)}+ v_{wg}[/tex]

Solving for [tex]v_{wg}:[/tex]

[tex]v_{wg} = 145 km/h + 165 km/h = 310 km/h[/tex]

Therefore, the velocity of the wind relative to the observer is 310 km/h toward the north.

The magnetic field at a point 1.2 m from the axis has a magnitude of 7.0 × 10^–6 T

Maxwell's equation is a set of coupled partial differential equations that together with the Lorentz force law form the classical electromagnetism, classical optics, and electric circuits.

Integral form in the absence of magnetic or polarizable media are Gauss' law for electricity, Gauss' law for magnetism, Faraday's law of induction, Ampere's law

A 0.70 m radius cylindrical region contains a uniform electric field that is parallel to the axis and is increasing at the rate [tex]5.0* 10^{12} v/m.s[/tex]  The magnetic field at a point 1.2 m from the axis has a magnitude of?

The Maxwell’s law of induction is as follows. Consider the charging of our circular  plate capacitor , B field also  induced at  point 2.  When capacitor stops charging  B field disappears.

By using the Maxwell’s law of induction for a circle of radius r.

[tex]2\pi rB = \epsilon_{0}\mu_{0}\pi r^2 \frac{dE}{dt} , B = \frac{1}{2}  \epsilon_{0}\mu_{0}r\frac{dE}{dt} = 7*10^{-6}T[/tex]

Grade: 9

Subject:  physics

Chapter:  electric field

Keywords: magnetic field, a uniform electric field, parallel,  the axis,  point

Final answer:

The question is related to Faraday's law, but cannot be answered without additional information regarding the changing electric field.

Explanation:

The question asks for the magnitude of the magnetic field at a point 1.2 m from the axis of a cylindrical region where there is a uniform electric field increasing at a given rate. This is related to Faraday's law of electromagnetic induction, which relates the time rate of change of the magnetic field to the induced electric field in the surrounding region. However, the question provided is incomplete and does not provide sufficient information to solve for the magnetic field at the given distance without information such as the direction or the specific distribution of the increasing electric field.

The expanded-function dental assistant (EFDA) can play a major role in the fabrication and temporary cementation of a provisional crown or bridge. It is the dentist’s and the EFDA’s responsibility to remain current with the new provisional materials and techniques that are available. It is essential that a provisional crown or bridge remain cemented while the fixed prosthesis is being prepared and delivered to the dental office. When the patient returns for final cementation of a fixed crown or bridge, the provisional should be cautiously removed without causing any fracture or harm, just in case it will need to be recemented if the final prostheses needs to be sent back to the lab for adjustments and remake.

The Expanded Functions Dental Assistant in dentistry plays an essential role in creating provisional restorations or temporary crowns. They clean and prepare the tooth, create molds for the provisional coverage, adjust its fit, and provide patient education and care instructions.

The Expanded Functions Dental Assistant (EFDA) plays a crucial role in the process of creating provisional coverage or temporary crowns in dentistry. This involves reestablishing the function, esthetics, and comfort for the patient temporarily until the definitive restoration can be placed.

EFDA's typically apply local anesthesia, clean and prepare the tooth that is to receive the coverage, and take impressions of the tooth to create a mold upon which the provisional coverage will be formed. They have been trained to mix the proper materials to create the provisional restoration and adjust it once in place in order to provide the patient with maximum comfort and functionality. Lastly, they also provide post-procedural care instructions and educate the patient about potential risks and complications.

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