if the power of a speaker is doubled and the area through which the sound is emitted is also doubled, does the intensity of the sound increase, decrease, or stay the same?

The distance of the image from the lens is 18.03 cm.

The distance of the image from the lens is calculated as follows;

Using lens formula;

1/f = 1/v + 1/u

where;

The distance of the image from the lens is calculated as follows;

1/v = 1/f - 1/u

The given parameters;

f = 17.1 cm

u = 333 cm

1/v = 1/17.1 - 1/333

1/v = 0.05548

v = 1/0.05548

v = 18.03 cm

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The general (implicit) solution to Stefan's equation is given by:

ln((M^2 + T^2)/(M^2 - T^2)) = 2σt + 2C, where C is the constant of integration.

To solve Stefan's equation, we can separate the variables and integrate both sides. Let's proceed with the steps:

First, rewrite the equation as follows:

(1/(M^4 - T^4)) * dT/dt = σ

Now, we integrate both sides with respect to t:

∫(1/(M^4 - T^4)) * dT = ∫σ * dt

The left side of the equation requires integration by partial fractions. The integral can be expressed as:

1/(M^4 - T^4) = A/(M^2 + T^2) + B/(M^2 - T^2)

To determine the constants A and B, we can use the method of partial fractions. Multiply through by (M^4 - T^4) and then equate the numerators:

1 = A(M^2 - T^2) + B(M^2 + T^2)

Expanding and rearranging, we have:

1 = (A + B)M^2 + (A - B)T^2

Equating the coefficients of the powers of T, we get:

A + B = 0 (coefficient of T^2)

A - B = 1 (constant term)

Solving these equations simultaneously, we find A = 1/2 and B = -1/2.

Substituting the partial fraction decomposition back into the integral, we have:

∫(1/(M^4 - T^4)) * dT = ∫(1/2)*((1/(M^2 + T^2)) - (1/(M^2 - T^2))) * dT

Integrating both sides, we obtain:

(1/2) * (ln(M^2 + T^2) - ln(M^2 - T^2)) = σt + C

where C is the constant of integration.

Finally, solving for T, we can write the general (implicit) solution to Stefan's equation as:

ln((M^2 + T^2)/(M^2 - T^2)) = 2σt + 2C

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At point C along the horizontal axis, the net electric field is zero. In the region B along the horizontal axis , a point exists at which the net electric field is zero.

The electric field is defined as the force acting on a positive test charge, per unit charge. It is similar to the gravitational field on the surface of the Earth for a test mass mo.

The electric field is a vector field. It has a magnitude and a direction. Another example vector field is the wind distribution. Temperature distribution is an example of a scalar field.The lines themselves have no meaning. The field is present everywhere.

Lines indicate the direction of F if a test charge is placed there Field lines point away from positive charge, and toward negative charge, Density of lines indicates the strength of the field. Field lines cannot cross. If they did, there would be more than one possible direction for a particle to travel at a given point.

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Uranus and Neptune are like the other Jovian planets because they have a lot of gaseous composition, they lack a solid surface, and they are situated far from the sun.

The Jovian planets are four planets in the outer solar system that are gas giants, also known as the gas planets. They are Jupiter, Saturn, Uranus, and Neptune. In terms of the composition of Uranus and Neptune, they contain methane, ammonia, water, and other elements that form gas. Like the other Jovian planets, they lack a solid surface, and they are situated far from the sun.

The rings of Uranus and Neptune are fainter and less complex than the rings of Jupiter and Saturn, but they share certain features. Both Uranus and Neptune are thought to have a small rocky core surrounded by a mix of rock and ice, then a thick layer of metallic hydrogen, and an atmosphere mainly of molecular hydrogen and helium. So therefore because gaseous composition, lack a solid surface, and situated far from the sun, Uranus and Neptune are like the other Jovian planets.

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Answer:

125,000

Explanation:

The kinetic energy of the ball at the highest point of its motion is equal to 90.2 Joules.

Given the following data:

Mass of baseball = 0.150 kg

Speed of baseball = 40.0 m/s

V = v Cos(θ)

V= v cos 30

V= 40 x 0.867

V=34.68 m/s

K.E =1/2 MV^2

K.E= 1/2 x 0.150 x 34.68^2

K.E= 90.2 Joules.

Kinetic energy is a type of energy that an object or particle has due to its motion. When work is done on an object by applying a net force that transfers energy, the object accelerates, thereby gaining kinetic energy.

Kinetic energy has three subcategories: vibration, rotation, and translation. Naturally, the oscillating kinetic energy is caused by a vibrating object. Rotational kinetic energy is generated by moving an object, and translational kinetic energy is caused by the collision of an object.

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Answer: B

Explanation: positive and negative charges attract each other and get stronger as they get closer

When the amplitude of a sound wave is tripled, the intensity of the sound wave will increase by a factor of 9. The correct option is c.

This is because the intensity of a sound wave is directly proportional to the square of its amplitude. So, when the amplitude is multiplied by 3, the intensity will be multiplied by 3², which is 9.

Therefore, increase by a factor of 9. Remember that the amplitude of a sound wave is related to its loudness, and by tripling the amplitude, you are significantly increasing the energy of the sound wave, leading to a higher intensity. The correct option is c.

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Complete question:

If the amplitude of a sound wave is tripled, the intensity will

a. decrease by a factor of 3.

b. increase by a factor of 3.

c. increase by a factor of 9.

d. decrease by a factor of 9.

e. remain the same.

Answer:

Density is equal to mass divided by volume.

Explanation:

Density = mass / volume

or

p=m/v

Answer:

Use the formula D=m/v

Explanation: In order to find the volume for these objects, use a ruler and measure the length, width, and height. Proceed to multiply them all together, L*W*H. To find the mass of an object, I would say to use a triple beam balance. After finding both the mass and volume of you object, use the formula D = m/v and you'll get your answer.

Answer:

The density (more precisely, the volumetric mass density; also known as specific mass), of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: ρ=m/V where ρ is the density, m is the mass, and V is the volume. In some cases (for instance, in the United States oil and gas industry), density is loosely defined as its weight per unit volume, although this is scientifically inaccurate – this quantity is more specifically called specific weight.

Explanation:

Answer:

Density is a measure of mass per volume. The average density of an object equals its total mass divided by its total volume. An object made from a comparatively dense material (such as iron) will have less volume than an object of equal mass made from

Explanation:

The degree received after completing a two-year program at a community college is called an associate's degree.

A community college, junior college, online university, or some four-year institutions in the US all grant associate degrees, which are two-year college degrees. A bachelor's degree and an associate's degree are the two highest levels of education.

Associate degrees serve as a basis for further education and can speed up the completion of bachelor's degrees, allowing students to pursue academic and professional ambitions.

A bachelor's degree is frequently pursued after earning an associate's. The general education, core, and elective requirements for the four-year degree can be satisfied using transfer credits from a two-year associate program. These associate degrees may be offered online by community colleges, which usually have lower tuition than four-year institutions.

Associate degrees can also prepare students for entry-level positions.

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The self-inductance of the coil is 69.6 mH. To calculate the self-inductance of the coil, we'll use the formula for induced emf (electromotive force) in a coil, which is: emf = -L * (ΔI / Δt), where emf is the average induced electromotive force, L is

Using the formula for the self-induced emf in a coil, which is given by emf = -L (change in current / change in time), where L is the self-inductance of the coil, we can rearrange the formula to solve for L: L = -emf / (change in current / change in time)

Substituting the given values, we get: L = -12 mV / ((2.4 A - 4.1 A) / 0.49 s) L = 69.6 mH

Therefore, the self-inductance of the coil is 69.6 mH.

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Answer:

yes

Explanation: Work is done when there is movement. Therefore it was work was being done.

It takes approximately 0.189 seconds for the bullet to stop moving within the tree trunk, assuming the frictional force is constant.

Frictiοn is the fοrce that resists mοtiοn when the surface οf οne οbject cοmes in cοntact with the surface οf anοther.

Given:

Mass of the bullet (m) = 7.80 g = 0.0078 kg

Initial velocity of the bullet (u) = 590 m/s

Final velocity of the bullet (v) = 0 m/s (since it stops moving)

Distance penetrated by the bullet (s) = 5.60 cm = 0.0560 m

To calculate the time it takes for the bullet to stop moving, we can use the equation of motion:

\(\rm v^2 = u^2 + 2as\)

Plugging in the values:

0² = (590 m/s)² + 2 * a * 0.0560 m

Simplifying:

0 = 348100 m²/s²+ 0.112 m * a

Rearranging the equation to solve for deceleration (a):

a = -348100 m²/s² / 0.112 m

a ≈ -3.107 × 10⁶ m²/s²

The negative sign indicates deceleration.

To find the time (t), we can use the equation:

a = (v - u) / t

Plugging in the values:

-3.107 × 10⁶ m²/s² = (0 m/s - 590 m/s) / t

Simplifying:

-3.107 × 10⁶ m²/s² = -590 m/s / t

Cross-multiplying:

-3.107 × 110⁶ m²/s² * t = -590 m/s

Dividing both sides by -3.107 × 10⁶ m²/s²:

t = -590 m/s / (-3.107 × 10⁶ m²/s²)

t ≈ 0.189 s

Therefore, it takes approximately 0.189 seconds for the bullet to stop moving within the tree trunk, assuming the frictional force is constant.

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Answer:

A) v₁ = 5.66 [m/s]

Explanation:

To solve this problem we must use the definition of linear momentum conservation, which tells us that momentum is conservation before and after a collision.

The linear momentum is equal to the mass by the product of the Velocity.

P = m*v

where:

P = lineal momentum [kg*m/s]

m = mass [kg]

v = velocity [m/s]

Now, to the right side of the equal sign will take the linear momentum before the collision and to the left side of the equal sign as after the collision.

Pbefore = Pafter

(m₁*v₁) - (m₂*v₂) = (m₁*v₃) + (m₂*v₄)

where:

m₁ = mass of the car = 1450 [kg]

v₁ = velocity of the car before the collision [m/s]

m₂ = mass of the shopping cart = 60 [kg]

v₂ = velocity of the shopping cart before the collision = -1.2 [m/s]

v₃ = velocity of the car after the collision = 5.13 [m/s]

v₄ = velocity of the shopping cart after the collision = 11.75 [m/s]

Now replacing:

(1450*v₁) - (60*1.2) = (1450*5.13) + (60*11.75)

1450*v₁ - 72 = 7438.5 + 705

1450*v₁  = 7438.5 + 705 + 72

1450*v₁ = 8215.5

v₁ = 5.66 [m/s]

Answer:

5.67 m/s

Just did it.

Answer:

the motion of an object at a constant speed along a circular path is known as Uniform circular motion

As the temperature of a volume of air increases, the air molecules move faster, making them more tightly packed and thus increasing the air's density. false

As the temperature of a volume of air increases, the air molecules move faster, which causes them to spread out and occupy a larger volume. This decrease in the air's density is due to the fact that the pressure of the gas is determined by the number of gas molecules present in a given volume, and an increase in temperature reduces the number of molecules per unit volume, resulting in a decrease in density.

This relationship is described by the ideal gas law, which states that the pressure of a gas is inversely proportional to its volume, and directly proportional to its temperature and the number of molecules present.

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False. The air molecules move more quickly when the temperature of a volume of air rises, which causes them to spread out more and decrease the density of the air.

The mass of a gas's molecules and how tightly they are packed affect the gas' density. The average kinetic energy of a gas's molecules rises as its temperature rises, which causes the molecules to move faster and farther away from one another. This indicates that the density of the gas is decreasing since there are less molecules present in a given amount of gas. On the other hand, as a gas's temperature drops, its molecules move more slowly and pack closer together, increasing the gas' density.

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Answer:

Controlled variable: the height from which the ball is dropped and the floor tile on which the ball hits

Independent variable: different tennis ball brands

Dependent variable: height of bounce in centimeters

Explanation:

Scientific experiments have three major kinds of variables:

Independent variable: This is the variable that is subject to the manipulation of the experimenter. The values of this variable are determined by the experimenter. In this example, Elizabeth determines the brand of tennis ball to be tested, hence the tennis ball brand is the independent variable

Dependent variable: This variable has values which are a result of the effect of the manipulation of the independent variable. The values of the dependent variable are not under the direct control of the experimenter. They are simply the results of the experiment. Here, the height to which the ball bounces is not predetermined, hence it is the outcome or dependent variable.

Control variables; These are variables that can affect the outcome of the results of the experiment but are kept constant throughout the experiment, to rule out biases when testing the effect of the independent variable.

The stall speed of an airplane under a load factor of 2 if the unaccelerated stall speed is 100 knots is 140.(option.c)

The stall speed of an airplane under a load factor of 2 can be calculated by multiplying the unaccelerated stall speed by the square root of the load factor. In this case, the load factor is 2, so we can calculate the stall speed as follows:

Stall speed under load factor of 2 = 100 knots x √2

= 100 knots x 1.414

= 141.4 knots

Therefore, the closest option from the given choices is option C, which is 140 knots. This means that the airplane's stall speed will increase to 140 knots when subjected to a load factor of 2, which is important information for pilots to be aware of to ensure safe flying practices.

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A 1.0 N metal disk rest on an index card that is balanced on the top of the glass, then the net force acting on the disk is 0 N.

A force in physics is an effect that has the power to alter an object's motion. A mass-containing object's velocity can alter, or accelerate, as a consequence of a force. Intuitively, a push or even a pull can also be used to describe force. Being a vector quantity, a force also has magnitude and direction. The SI unit of newton is often used to measure it (N). The letter F stands for force.

As per Newton's second law's initial conception, an entity's net force is equal to the speed at which its momentum is changing over time.

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Answer:

When objects fall to the ground, gravity causes them to accelerate.

The property of a transverse wave that stays the same even as the wave's energy and other properties change is the wavelength.

The correct option to the given question is option a.

The wavelength is the distance between two successive points of the wave that are in phase. As the wave's energy and amplitude change, the distance between two successive points of the wave that are in phase remains the same.

This is because wavelength is determined by the frequency of the wave and the speed of propagation. The frequency of the wave is the number of cycles of the wave that occur in one second, while the speed of propagation is the rate at which the wave travels through a medium.

If the frequency of the wave and the speed of propagation remain the same, then the wavelength will also remain the same even as the wave's energy and other properties change. This property is known as the characteristic of the wave.The amplitude is the maximum displacement of a point on the wave from its rest position. The frequency is the number of cycles of the wave that occur in one second. The rest position is the position of the medium when it is not disturbed.

Hence, wavelength of a transverse wave remains same even as the wave's energy and other properties change.

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Answer:

it makes most recourses and gives us most of a materials

Explanation:

The application of scientific knowledge to benefit people is referred to as technology.

This is referred to as the different ways in which scientific knowledge is applied so as to improve the living conditions and to ensure the practical aims of individuals are achieved.

Technology such as the invention of vehicles made it easier for the movement of goods and people from one place to another.It helped reduce stress and ensured that emergency situations were promptly attended to. It employed scientific knowledge such as motion, inertia etc in the design and production of it.

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Answer:

30.66667

Explanation:

this should be it i did the math

The measured open-circuit voltage of 0.66 V is lower than the expected value of 0.706 V due to non-ideal effects such as series resistance, shunt resistance, and recombination losses.

What is Circuit?

A circuit is a closed loop through which electric current can flow. It consists of a network of interconnected components, such as resistors, capacitors, inductors, diodes, transistors, and other electronic components, that are designed to perform a specific function.

Solving for Voc, we get:

Voc = (kT/q)ln(Jse/Jo + 1)

For one-sun illumination at room temperature, J = 30 mA/cm2. Therefore, we can find Jo and Jse using the given values of J and Voc:

J = Jse - Jo[exp(qVoc/kT)-1]

30 = Jse - Jo[exp(0.6/q)-1]

Jo = 8.73×10-10 A/cm2

Jse = 34.9 mA/cm2

Using these values, we can find the open circuit voltage Voc under illumination by 100 suns:

Voc = (kT/q)ln(Jse/Jo + 1) ≈ 0.706 V

The ideal diode equation for solar cells assumes that the solar cell is an ideal diode with zero series resistance and shunt resistance, and no recombination losses. In practice, solar cells exhibit non-ideal behavior, which can result in a discrepancy between the measured and expected values of the open circuit voltage.

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The efficiency of the heat engine is 30%.

To calculate the efficiency of the heat engine, follow these steps:

1. Identify the heat exhausted (Q2) and the useful work (W) performed: Q2 = 8000 J and W = 2400 J.
2. Calculate the total heat input (Q1): Q1 = Q2 + W = 8000 J + 2400 J = 10400 J.
3. Determine the efficiency using the formula: Efficiency = (W/Q1) × 100% = (2400 J / 10400 J) × 100% = 30%.

The efficiency of the heat engine is determined by dividing the useful work performed by the total heat input and multiplying the result by 100%. In this case, the heat engine exhausts 8000 J of heat and performs 2400 J of useful work, resulting in an efficiency of 30%.

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The gravitational force of attraction between them is 3.56 * 10⁻⁴ N

F = G*M1M2/d²,

where G = 6.67 * 10⁻¹¹ Nm²Kg⁻²,

M1 = 8000Kg and M2 = 1500 Kg,

F =  6.67 * 10⁻¹¹ * 8000 * 1500 / (1.5)² F = 3.56 * 10⁻⁴ N

The gravitational force of attraction between them is 3.56 * 10⁻⁴ N.

The universal gravitational law of Newton. According to this law, every body in the universe is attracted to every other body with a force that is inversely proportional to the square of the distance between them and proportional to the product of their masses.

Therefore, The gravitational force of attraction between them is 3.56 * 10⁻⁴ N.

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