a tuning fork with a frequency of 200 hz will resonate if a sound wave incident on it has a frequency of

why freezer is made in the upper part of refrigrator

the cold air produced from it is denser than the warmer air in the bottom

Freezer is normally provided at the top of the refrigerator, because density of the cold air is high compared to the hot air. In a refrigerator the air contacts with the cooling coil and gets cooling.Because of the high density the cold air gets down and the warm air/hot air moves upward and gets cooling from the cooling coil/evaporator coil. This process is repeated. If the Freezer is provided at the bottom place of the refrigerator, the cold air can't to move full area of the refrigerator. So the freezer is normally provided at the top at the refrigerator

A total differential is an equation in which all the differentials can be integrated independently of each other. To verify that the given expressions are total differentials, we must check if they meet the conditions of being an exact differential function.The given expression is not an exact differential function.

According to the exact differential function, an expression dQ should be equal to the sum of two partial derivatives of the same function. i.e, dQ= dP+ dRA primitive function of an expression is obtained by integrating the given expression partially. Let's solve the given expressions, one by one:

1. Expression : (x² + 2xy-y²)dx + (x²-2xy - y²)dy. Now, we need to find the partial derivatives of the above function with respect to x and y.∂P/∂x = x² + 2xy - y²  ∂Q/∂y = x² - 2xy - y².

On verifying, we get:∂P/∂x = ∂Q/∂y.

Hence, the given expression is an exact differential function.

To find the primitive function, we need to integrate any one of the partial derivatives with respect to x and other with respect to y.

∴ P(x,y) = ∫(x² + 2xy - y²)dx = x³/3 + x²y - xy² + C1 and ∴ Q(x,y) = ∫(x² - 2xy - y²)dy = x²y - y³/3 + C2.

Therefore, the primitive function of the expression is: P(x,y) = Q(x,y) = x³/3 + x²y - xy² - y³/3 + C2.

Expression : (2xcosy - y² sinx) dx + (2ycosx - x² siny) dy. Now, we need to find the partial derivatives of the above function with respect to x and y.∂P/∂x = 2cosy  ∂Q/∂y = 2ycosx.

On verifying, we get:∂P/∂x ≠ ∂Q/∂y .

Hence, the given expression is not an exact differential function.

Therefore, there does not exist a primitive function for the given expression.

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Answer:

the answer is all of the above

Explanation:

brainliest please

Answer:

in front of you

Explanation:

Your hand blocks the light of lamp , causing a shadow to form in front of you

Answer: 25

Explanation:

The kinetic energy of the object moving at the given mass and velocity is 25 J.

The given parameters;

The kinetic energy of the object moving at the given mass and velocity is calculated as follows;

K.E = ¹/₂mv²

K.E = ¹/₂ x 50 x 1²

K.E = 25 J

Thus, the kinetic energy of the object moving at the given mass and velocity is 25 J.

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Answer: Force

In physical science, a force is something that acts on an object by pushing or pulling it. If the force is strong enough, it changes the position or shape of the object. Forces such as friction, air resistance and simple physical contact touch the object directly, while forces like gravity, magnetism and electrostatics act on the object from a distance. Force is a vector quantity, meaning you can measure both its strength and its direction. The formula to find the measure of a force is force = mass times acceleration, written as f = ma.

Velocity

The faster something is moving, the higher its velocity.

When an object is moving, one way to measure how fast it is moving is by finding its velocity, which is the rate at which it is changing position. Like force, velocity is a vector quantity, so it includes direction. To find the average velocity of an object, divide the change in its position by the time the movement took, and state its direction. For example, if a car is driving north and in one hour's time it travels 30 miles, its velocity is 30 miles per hour, north.

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Answer:

Technetium.

Explanation:

Tc is a very versatile radioisotope, and is the most commonly used radioisotope tracer in medicine. It is easy to produce in a technetium-99m generator, by decay of 99Mo. ... Tc decays by gamma emission, with a half-life: 6.01 hours.

Answer:

its the fourth one

Answer:

The density of the substance is

\(0.85\: \: g \: \: \: {cm}^{ - 3}\)

Hope you could get an idea from here.

Doubt clarification - use comment section.

To yield the biggest Doppler shifts, it is advisable to choose the option of studying nearby stars. The Doppler shift is a phenomenon that occurs when an object emitting waves, such as light, is moving relative to an observer.

In the context of searching for exoplanets, astronomers look for variations in the spectral lines of stars caused by the gravitational pull of orbiting planets.

By studying nearby stars, astronomers can benefit from a closer proximity between the observer and the target star. When a star with an orbiting planet moves towards or away from Earth, the Doppler shift in its spectral lines becomes more pronounced. This effect is known as the radial velocity method, and it allows scientists to detect the presence of exoplanets by observing the shifts in the star's spectral lines caused by the planet's gravitational influence.

By focusing on nearby stars, the relative motion between the observer and the star is greater, resulting in larger Doppler shifts. This enhances the chances of detecting exoplanets and obtaining more accurate measurements of their orbital characteristics.

In contrast, studying faraway stars would result in smaller Doppler shifts since the relative motion between the observer and those stars is typically less significant. Therefore, to maximize the chances of detecting exoplanets through Doppler shifts, astronomers should prioritize studying nearby stars.

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Answer:

is: B. why ? u ask.... well u forgot one important factor when ansering that factor being that...... H'ES CRACKED AT FORTNITE MY GUY

i desereve bwainweist... JK LOL give it to the other guy.

The given one is an experiment because it tests a cause and effect relationship. The rate of photosynthesis is determined by measuring the concentration of carbon dioxide on an enclosed transparent chamber.

Photosynthesis is a biochemical process by which green plants synthesis chemical energy with the aid of light energy. The photosynthetic reaction is  the combination of carbon dioxide and water to form oxygen molecule and glucose.

The photosynthetic reaction is given here:

\(\rm 6CO_{2} + 6H_{2}O \rightarrow C_{6}H_{12}O_{6} + 6O_{2}\)

Here, the oxygen gas is the product in the reaction. Hence, increase in the oxygen level will reverse the reaction and thus, rate of photosynthesis decreases.

The rate of photosynthesis is determined by the measurement of concentration of carbon dioxide within the closed transparent chamber in which the plant is placed. Hence, we are testing a cause and effect and it is a scientific experiment. Hence, option A is correct.

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Answer: 570 J

Explanation:

The amount of heat gained by the piece of zinc can be calulctaed using   ∆Q = mc∆T

=> ∆T = 36-26 = 10°C

m = 0.15 kg, s = 380J/kg/°C

=> ∆Q = 0.15 x 380 x 10

= 570J

ANSWER:

a) 5 V

b) 8.33 A

c) step-up transformer

STEP-BY-STEP EXPLANATION:

a)

To calculate the input voltage it would be:

b)

To calculate the output current it would be:

c)

We have to:

Step-up transformer increase the output voltage.

Step-down transformer reduces the output voltage.

In this case, the voltage goes from being 5 V to being 12 V, therefore the output voltage increases, which means that it would be a step-up transformer.

The solution of Sulfuric Acid (H2SO4) has the following mole fractions:

To solve this problem the formula and the procedure that we have to use is:

Where:

Information about the problem:

We calculate the moles of the H2SO4 and of the H2O from the Pm:

MW = ∑ AWT

MW (H2SO4)= AWT (H) * 2 + AWT (S) + AWT (O) * 4

MW (H2SO4)= (1 g/mol * 2) + (32,064 g/mol) + (16 g/mol * 4)

MW (H2SO4)= 2 g/mol + 32 g/mol + 64 g/mol

MW (H2SO4)=  98 g/mol

MW (H2O)= AWT (H) * 2 + AWT (O)

MW (H2O)= (1 g/mol * 2) + (16 g/mol)

MW (H2O)= 2 g/mol + 16 g/mol

MW (H2O)=  18 g/mol

Having the Pm we calculate the moles of H2SO4:

n = m / MW

n(H2SO4) = m(H2SO4) / MW (H2SO4)

n(H2SO4) = 17.75 g / 98 g/mol

n(H2SO4) = 0.1811 mol

With the density and the volume of the solution we get the mass:

ρ(solution)= m(solution) /v(solution)

m(solution) = v(solution) * ρ(solution)

m(solution) = 100 ml * 1.094 g/ml

m(solution) = 109.4 g

Having the mass of the solution we calculate the mass of the water in the solution:

m(H2O) = m(solution) - m solute (H2SO4)

m(H2O) = 109.4 g - 17.75 g

m(H2O) = 91.65 g

We calculate the moles of H2O:

n = m / MW

n(H2O) = m(H2O) / MW (H2O)

n(H2O) = 91.65 g / 18 g/mol

n(H2O) = 5.092  mol

We calculate the total moles of solution:

total moles of solution = n(H2SO4) + n(H2O)

total moles of solution = 0.1811 mol + 5.092  mol

total moles of solution = 5.2731 mol

With the moles of solution we can calculate the mole fraction of each component:

mole fraction (H2SO4)= moles of (H2SO4) / total moles of solution

mole fraction (H2SO4)= 0.1811 mol / 5.2731 mol

mole fraction (H2SO4)= 0.034

mole fraction (H2O)= moles of (H2O) / total moles of solution

mole fraction (H2O)= 5.092  mol / 5.2731 mol

mole fraction (H2O)= 0.966

In chemistry a solution is known as a homogeneous mixture of two or more components called:

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Answer:

75g

Explanation:

Given parameters

Mass of product  = 375g

Mass of reactant X  = 300g

Unknown:

Mass of reactant Y  = ?

Solution:

To solve this problem, we need to understand the law of conservation of mass. The law states that "matter is neither created nor destroyed in a chemical reaction".

So;

      Mass of X + Mass of Y   =  Mass of product

            Mass of Y = Mass of product  - Mass of X

           Mass of Y  = 375  - 300  = 75g

a) Height of 2.5 m if the stationary mass is also 5.0 kg. b) Height of 1.25 m if the stationary mass is 10.0 kg. c) The first bowling ball will not be able to travel back up the ramp if the stationary mass is 500.00 kg.

a) In a perfectly elastic collision, both momentum and kinetic energy are conserved. Since the stationary mass has the same mass as the first bowling ball, they will exchange velocities after the collision. The first bowling ball will reverse its direction and travel back up the ramp to the same height from which it started, which is 2.5 m.

b) If the stationary mass is 10.0 kg, the collision will result in a different outcome. After the collision, the first bowling ball will still reverse its direction, but it will not reach the same height as before. Using the conservation of momentum and kinetic energy, we can calculate that the first bowling ball will reach a height of 1.25 m.

c) If the stationary mass is 500.00 kg, the first bowling ball will not be able to travel back up the ramp after the collision. The large mass of the stationary object will significantly affect the outcome of the collision, preventing the first bowling ball from reaching any positive height.

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The air carbon arc-cutting process requires compressed air in the range of approximately 80 psi to 100 psi. This cutting method utilizes an electric arc to generate heat, which melts the metal being cut, while the compressed air stream blows away the molten material, creating a clean and precise cut.

The pressure of the compressed air plays a crucial role in the effectiveness and quality of the cut.

It is important to maintain the appropriate pressure range (80-100 psi) for optimal cutting results. Insufficient air pressure may result in inadequate removal of molten material, leading to a poor-quality cut or even an incomplete cut. On the other hand, excessive air pressure can cause unnecessary wear on the cutting equipment, as well as create a wider kerf or excessive distortion in the workpiece.

The air carbon arc cutting process is suitable for cutting various types of metals, including steel, stainless steel, aluminum, and cast iron. This method is popular in various industries due to its high cutting speed, minimal heat-affected zone, and versatility in cutting various metal thicknesses. It is essential to select the appropriate cutting parameters, including air pressure, to achieve the best possible cutting results.

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The radius of the circle is equal to (Tension x 6 m) / 1,6200,000 kg x degrees^2

Radius is a straight line extending from the center of a circle or sphere to its circumference or surface. It is a term used in geometry and is measured in length. It is half of the diameter of a circle, and is sometimes referred to as the “radius of a circle”. It is used to measure curved lines, arcs, and circles. The radius of a circle is the same as the length of a line segment from the center of the circle to a point on its circumference.

The radius of the circle can be calculated using the formula:

Radius = (Tension x Length) / (Mass x Angular Velocity^2).

In this case, the radius would be:

Radius = (Tension x 6 m) / (2 kg x (angular velocity^2))

Radius = (Tension x 6 m) / (2 kg x (angular velocity x angular velocity))

Radius = (Tension x 6 m) / (2 kg x (angular velocity^2))

Radius = (Tension x 6 m) / (2 kg x (30 degrees x 30 degrees))

Radius = (Tension x 6 m) / (2 kg x (900 degrees^2))

Radius = (Tension x 6 m) / (2 kg x 810,000 degrees^2)

Radius = (Tension x 6 m) / 1,6200,000 kg x degrees^2

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The value of the normalization constant for the given probability density function is A = 3.801 x 10^13 m^-1.

The probability density for finding an electron at position x on the screen is given by:

P(x) = Aexp(-2(x-x0)/w)

where A is the normalization constant, x0 is the center of the screen, w is the width of the screen.

To find the value of the normalization constant A, we need to integrate the probability density over the entire screen and set the result equal to 1, since the probability of finding an electron somewhere on the screen must be equal to 1.

The screen ranges from 0 nm to 20 nm, so we have:

∫(0 to 20 nm) P(x) dx = 1

Substituting the expression for P(x), we get:

∫(0 to 20 nm) Aexp(-2(x-x0)/w) dx = 1

To solve this integral, we can make the substitution u = (x-x0)/w, which gives:

∫(-x0/w to (20-x0)/w) A×exp(-2u) w du = 1

Simplifying, we get:

Aw[-(1/2)×exp(-2u)]|(-x0/w to (20-x0)/w) = 1

Evaluating the limits of integration and simplifying, we get:

Aw(exp(x0/w)-exp((x0-20)/w))/2 = 1

Since we know the values of w and x0, we can solve for A:

A = 2/[(20 nm)×(exp(-10 nm/w)-exp(-30 nm/w))]

Using the given values of kinetic energy and the de Broglie wavelength formula λ = h/p, where h is Planck's constant and p is the momentum of the electron, we can calculate the de Broglie wavelength of the electrons:

λ = h/p = h/sqrt(2me×KE)

where m is the mass of the electron, e is the charge of the electron, KE is the kinetic energy of the electron.

Substituting the given values, we get:

λ = 6.626 x 10^-34 J s / sqrt(2×(9.109 x 10^-31 kg)(1.602 x 10^-19 C)(10 eV))

λ = 0.386 nm

Since the screen ranges from 0 nm to 20 nm with a step size of 1 nm, there are 21 intervals on the screen. We can use the value of the normalization constant A to calculate the probability density for each interval:

P(x) = Aexp(-2(x-x0)/w)

where w = 1 nm and x0 = 10 nm (since the screen ranges from 0 to 20 nm).

Substituting the values of A, w, and x0, we get:

P(x) = 3.801 x 10^13 × exp(-2×(x-10)/1)

So the value of the normalization constant A is:

A = 2/[(20 nm)×(exp(-10 nm/w)-exp(-30 nm/w))] = 3.801 x 10^13 m^-1.

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The thermodynamic quantity that combines enthalpy and entropy is Gibbs free energy. It is given by the equation: ΔG = ΔH - TΔS.

The thermodynamic quantity that combines enthalpy and entropy is Gibbs free energy. The Gibbs free energy is a thermodynamic function that determines the degree to which a reaction is spontaneous. The Gibbs free energy is given by the equation:ΔG = ΔH - TΔS where ΔG is the change in Gibbs free energy, ΔH is the change in enthalpy, T is the absolute temperature, and ΔS is the change in entropy.

The thermodynamic quantity that combines enthalpy and entropy is Gibbs free energy. It is given by the equation: ΔG = ΔH - TΔS.ΔG = Change in Gibbs free energy ΔH = Change in enthalpy T = Absolute temperature ΔS = Change in entropy

Gibbs free energy is a thermodynamic quantity that represents the energy available to do work in a system at constant temperature and pressure. It is a combination of the enthalpy and entropy of a system. It is a measure of the amount of free energy that is available to do work. This quantity is important in chemical thermodynamics, where it is used to determine the feasibility of a chemical reaction. The Gibbs free energy equation is given as ΔG = ΔH - TΔS, where ΔH is the change in enthalpy, T is the absolute temperature, and ΔS is the change in entropy. The Gibbs free energy can be used to predict whether a chemical reaction will occur spontaneously or not. If ΔG is negative, the reaction will occur spontaneously, and if ΔG is positive, the reaction will not occur spontaneously.

In summary, Gibbs free energy is a thermodynamic quantity that combines the enthalpy and entropy of a system. It is used to determine the feasibility of a chemical reaction and to predict whether a reaction will occur spontaneously or not. The Gibbs free energy equation is given as ΔG = ΔH - TΔS.

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Answer: the marble will remain in place at a constant velocity of zero

Explanation:

Newton's first law states that a body at rest will remain at rest, and a body in motion will remain in motion in a straight line at a constant velocityunless acted upon by an outside force

Answer:

red supergiants can

The correct answer is a. "The smaller the piece of wood, the faster it burns."

The state of subdivision of the reactants refers to the physical form or size of the reactant particles. It can have a significant impact on the rate of a chemical reaction. When the reactants are in a more finely divided or smaller state, there is a larger surface area available for reaction compared to when the reactants are in larger or bulk form.

In this case, the state of subdivision refers to the size of the wood pieces. Smaller pieces have a larger surface area exposed to oxygen, which increases the rate of reaction (burning).

Hence, The example of the state of subdivision of the reactants affecting the rate of reaction is:
a. the smaller the piece of wood, the faster it burns.

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0.017 is the probability that tab A won’t fit into slot B

Probability is related to possibility. Random event generation is the subject of this branch of mathematics. Values ​​range from 0 to 1. Probabilities are built into mathematics to predict the likelihood of certain events.

P(tab A won't fit into slot B) = P (A>B)

                                                = P( A-B > 0)

Given that, A ≈ N(30,0.5)   B ≈ N(32, 0.8)

Here,

E (A-B) = 30-32 = -2

V(A-B) = V(A) + V(B) = (0.5)² + (0,8)²

                                   = 0.89

SD (A-B) = \(\sqrt{0.89}\)

So, (A-B) ≈ N (-2, 0.9433)

P( A-B > 0) = 1 - P(A-B ≤ 0)

= 1 - P [(A - B +2 / 0.9433) ≤ (+2 / 0.9433)]

= 1 - P (Z₁ ≤ 2.12)

= 1 - 0.98300

= 0.017

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Answer:

D. Sound waves

Explanation:

The following options are missing:

A. radio wave

B. X-rays

C. Light waves

D. Sound waves

There are two kinds of waves: longitudinal and transverse.

In longitudinal waves, the vibrations are parallel to the direction of wave travel. Examples of longitudinal waves include: sound waves  and ultrasound waves.

In transverse waves, the vibrations are at right angles to the direction of wave travel. All electromagnetic waves (e.g. light waves, microwaves, radio waves and X-rays) are transverse waves.

The given statement The market price of a house is $125,000, and the home buyer borrows $100,000. Two points are equal to $2,000 is true.

Two points equaling $2,000 is a common convention in real estate transactions. Points, also known as loan origination fees, are typically calculated as a percentage of the loan amount. In this case, two points amount to $2,000 on a $100,000 loan.

If the home buyer is borrowing $100,000 and two points equal $2,000, it aligns with the given information. Therefore, the statement is true.

Points, in the context of real estate, refer to fees charged by lenders at the time of closing a mortgage loan. Each point is typically equal to 1% of the loan amount. These points are paid upfront by the borrower and are considered a form of prepaid interest.

The purpose of points is to lower the interest rate on the mortgage loan. By paying points, the borrower can reduce the overall interest expense over the life of the loan. Generally, each point paid upfront can lower the interest rate by a certain percentage, often referred to as "buying down" the rate.

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Answer:

Explanation:

In projectile,

Maximum height = \(\frac{u^{2}sin^{2} \theta }{2g}\) and range = \(\frac{u^{2}sin2\theta }{g}\)

u = velocity of the body

\(\theta\) = angle of launch

g = acceleration due to gravity

If the range equals the maximum height in an ideal projectile launch on a horizontal plane, this means;

\(\frac{u^{2}sin^{2} \theta }{2g} = \frac{u^{2}sin2\theta }{g}\)

since \(sin2\theta = 2sin\theta cos\theta\)

\(\frac{u^{2}sin^{2} \theta }{2g} = \frac{u^{2}2sin\theta cos\theta }{g}\\\frac{sin\theta}{2} =2cos\theta \\sin\theta = 4cos\theta\\\frac{sin\theta}{cos\theta} = 4\\tan\theta = 4\\\theta = tan^{-1} \\4\theta = 75.9^{0}\)

The angle at which the range equals the maximum height in an ideal projectile launch on a horizontal plane is approximately 76°

Answer:

normal force= 480.2 x component=477.4  y component= 110.4

Explanation:

I'm sorry I just did this today in class but i think normal force has to be equal to mg or the mass * gravity of the person and that would be 480.2 newtons. I multiplied 9.8 (gravity) by the mass of 49g

I think for the x and y components you can make a triangle with the angled string and then use sohcahtoa to solve for the tension. I used cos(13) = x/490 to solve for x component and then I used the pythagoran theroem to get the remaining side which would be : a^2 + 477.4^2 = 490^2

hope this can help and that it is correct. good luck

The magnitudes of the x- and y- components of the tension is 477.44N and 110.23N

The normal force acting on the skier is 480.2N

The magnitude of the x- and y- components of the tension is expressed as:

Given the following

Tension T = 490N

x = 490 cos13° = 477.44N

y = 490sin13° =  110.23N

Hence the magnitudes of the x- and y- components of the tension is 477.44N and 110.23N

The normal force acting on the skier is equal to the weight.

N = W = mg

N = W = 49 * 9.8

N = W = 480.2N

Hence the normal force acting on the skier is 480.2N

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The heat is convicted through the soup. The soup heats up as the spoon is in the soup making the spoon hot. its like saying pouring hot water into a cup and its hot on your hand its convecting through the glass and heating up

6.2137119 miles per hour is equal to 10 km/h. (8 digits rounded) Speed is measured in kilometers per hour.

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The expression for time it would take the rock from the moon to hit the ground, \(t_m = \sqrt{6} t_e\).

The acceleration due to gravity near moon's surface is about one-sixth of the value near the earth's surface.

The Newton's second law says,

\(s = ut +\dfrac{1}{2}a t ^2\)

This means acceleration is inversely proportional to square of time.

\(\dfrac{a_e}{a_m} = \dfrac{t_m^2}{t_e^2}\)

where, \(a_e\), \(a_m\) is the acceleration at earth and moon respectively.

and, \(t_e\), \(t_m\) is the time at earth and moon respectively.

\(a_m = \dfrac{1}{6} a_e\)

Hence, \(t_m = \sqrt{6} t_e\).

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