the reactant concentration in a zero-order reaction was 9.00×10−2 mm after 190 ss and 4.00×10−2 mm after 340 ss . what is the rate constant for this reaction?

The entropy change for the surroundings when 1.78 moles of NO(g) react at standard conditions is –19.7 J/K

The balanced equation for the given reaction is:2NO(g) + O2(g) → 2NO2(g)

For the given reaction: Δn = (2 + 0) – (0 + 2) = 0ΔH°rxn = –563.2 kJ/molΔS°rxn = 239.9 J/mol K

The entropy change for the surroundings when 1.78 moles of NO(g) react at standard conditions can be calculated using the formula:ΔS_surroundings = –ΔH°rxn / T = –(n × ΔH°f,products) / T

Here, n = number of moles of NO(g) = 1.78 molesΔH°f,products = standard molar enthalpy of formation of NO2(g) = +33.2 kJ/mol (from standard thermodynamic data at 298 K)T = temperature = 298 K (given)

Substituting the values in the above formula, we get:ΔS_surroundings = –[(1.78 mol) × (33.2 kJ/mol)] / (298 K)ΔS_surroundings = –19.7 J/K

The entropy change for the surroundings when 1.78 moles of NO(g) react at standard conditions is –19.7 J/K (negative because the reaction is exothermic and heat is released to the surroundings).Therefore, the correct option is B) –19.7 J/K.

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If the field changes at the rate of 50 T.s^-1,  the induced emf in the coil:  87 V. The correct option is A.

- Angle between magnetic field and coil axis: 37 degrees
- Number of turns in the coil: 200 turns

- Radius of the coil: 6 cm (0.06 m)
- Rate of change of magnetic field: 50 T·s^-1

Formula to calculate the induced emf:

Induced emf (E) = N * (dΦB/dt)
where N is the number of turns, and dΦB/dt is the rate of change of magnetic flux.

Calculate the area (A) of the circular coil:

A = π * r^2
A = π * (0.06 m)^2
A ≈ 0.0113 m^2

4. Calculate the rate of change of magnetic flux (dΦB/dt):

dΦB/dt = (dB/dt) * A * cos(θ)
dΦB/dt = 50 T·s^-1 * 0.0113 m^2 * cos(37°)
dΦB/dt ≈ 0.4437 Wb·s^-1

5. Calculate the induced emf (E):

E = N * (dΦB/dt)
E = 200 turns * 0.4437 Wb·s^-1
E ≈ 88.74 V

Therefore, the induced emf in the coil is approximately 87 V.

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Complete question:

A uniform magnetic field makes an angle of 37degree with the axis of a circular coil of 200 turns and radius 6 cm. If the field changes at the rate of 50 T.s^-1, what is the induced emf in the coil?

a. 87 V

b. 79 V

c. 124 V

d. 111 V

Answer:

Last option is correct

Explanation:

A reference point is a place or object used for comparison to determine if something is in motion. An object is in motion if it changes position relative to a reference point.

Answer: a position from which to measure future distance

Explanation:

I just took the test

Answer:

asteroid belt

Explanation:

The asteroid belt is a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars, that is occupied by a great many solid, irregularly shaped bodies, of many sizes but much smaller than planets, called asteroids or minor planets.

Answer:

Burrowing animals can cause weathering. By digging for food or making space to live in the animal may break apart rock. The growing roots of a tree can also break apart rock.

Answer:

electromagnetic radiation

Explanation:

If the total momentum of the insects is zero, this means all of the insects are at rest or are moving in opposite of each other. Same if the total kinetic energy is zero.

Momentum is the quantity of motion which is multiplied by the amount of matter moved i.e., mass and the velocity at which it moves. Because, the object is in motion, it is a vector quantity, it has both direction and magnitude. It is determined by the product of the object's mass and the velocity of object.

If the total momentum of the insects is zero, this could mean anything of the two things. Either, all of the insects are at rest or an equal amount of insects are moving in opposite direction of each other which cancels out the total momentum of the insects.

If the total kinetic energy of the insects is zero, this means either all of the insects are at rest or an equal amount of insects are moving in opposite direction of one another which results into canceling out the energy.

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Answer:

Using triangle or circle cereal boxes instead of rectangular prisms can have both advantages and disadvantages. Here are five points to consider:

Advantages:

Disadvantages:

When light changes directions as it encounters a different medium, it is called refraction.

Refraction occurs because the speed of light changes when it travels through different materials, such as air, water, or glass. This change in speed causes the light to bend as it enters or exits the new medium, leading to a change in direction.

The amount of bending that occurs depends on the angle at which the light hits the surface of the new medium, as well as the difference in refractive indices between the two materials. Refractive index is a measure of how much a material slows down the speed of light, and it varies between different materials.

Refraction is a fundamental phenomenon in optics and has numerous practical applications, such as in the design of lenses, prisms, and fiber optic cables.

It is also responsible for many natural phenomena, including the bending of light as it passes through a raindrop to create a rainbow, or the apparent bending of objects in a mirage due to the refraction of light through hot air.

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When middle polarizer is rotated rotated at 100 revolutions per minute we can take following steps into consideration-

This effect although not normally done with mechanical rotation, is the basis for making optical modulators that are used in high-speed digital communication systems by inserting the thermometer in solution and note down the temperature.

Remove the caps of polarimeter glass tube and measure the length of tube.

Setting up of sodium source in front of slit will be placed at the principal focus of lens of polarimeter.

\(Rotation=\alpha =\frac{\beta }{y}\)

β is the mean angle of rotation and y means length of polarimeter tube in decimeter.

\(y=\frac{len. of polarimeter}{10}\)

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Answer:

71.6 mph

Explanation:

you would do 645 divided by 9 which would give you 71.6

Answer:

\(V =-7221.43 \ V\)

Explanation:

The Electric Potential

The electric potential at a point is equal to the electric potential energy (measured in joules) of any charged particle at that location divided by the charge (measured in coulombs) of the particle.

To calculate the electric potential of a point charge Q at a distance r, we use the formula:

\(\displaystyle V=\frac{kQ}{r}\)

Where

\(k=9\cdot 10^9\ N.m^2/c^2\)

We are given the following data:

\(Q=-3.37\cdot 10^{-6}\ c\)

r = 4.20 m

Calculating:

\(\displaystyle V=\frac{9\cdot 10^9*(-3.37\cdot 10^{-6})}{4.2}\)

\(\mathbf{V =-7221.43 \ V}\)

Answer:

-7221.43 V

Explanation:

its for Acellus

Explanation:

distance

speed =_________

time

distance = speed × time

= 2.5 × 5.0

distance = 12.5 m

Explanation:

This happens because the gas inside tend to expand because its temperature gets higher.

This is why the balloon that is put in a freezer for too long tend to gets smaller, because the gas temperature that is inside the balloon decreases.

(you can try it at home)

It is related to the temperature of the gas.

Answer:

b

Explanation:

Machine 2’s mechanical advantage is greater, which means that this machine can do more work with less force than Machine 1.

The term mechanical advantage is the ratio of the radius of wheel to the radius of the axle for a wheel and axle system.

The true statement about the two machines that were compared; 1 and 2 is that, machine 2’s mechanical advantage is greater, which means that this machine can do more work with less force than Machine 1.

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Answer:

C

Explanation:

Earth would be the answer. pluto is slowest. then Saturn, Jupiter, mars

A materiel that allows electricity to flow easily is called an conductor

When we look at the sun, nearly all the visible light we see is emitted from the sun's photosphere. During total solar eclipses, the sun's corona is most easily seen.

What is the corona of the sun?

The corona of the sun is a halo of light that surrounds the sun and is visible during a total solar eclipse. It is a layer of hot, ionized gases, also known as plasma, that is constantly streaming away from the sun in all directions.

It is the outermost layer of the sun's atmosphere, extending out into space for millions of kilometers. The corona is mostly composed of hydrogen and helium ions.

What is the photosphere of the sun?

The photosphere is the layer of the sun that we see from Earth. It is the lowest layer of the sun's atmosphere and is composed mainly of hydrogen and helium gas.

It is the source of nearly all of the visible light and heat that we receive from the sun. The photosphere is about 400 km thick and has a temperature of around 5,500°C.

The photosphere is the layer of the sun that emits most of the light that we see, but during a total solar eclipse, the moon blocks out the photosphere, allowing us to see the corona.

The corona is much fainter than the photosphere, but it is still visible because it is much hotter, with temperatures reaching up to several million degrees Celsius.

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If the point charges q1 = -4.5nC and q2=+4.5 nC are separated by 3.1mm then the magnitude of the electric field vector is 8.5 × 10^4 N/C.

(a) The magnitude of the electric dipole moment is given by,`

p = qd

where q is the magnitude of the charge, and d is the displacement vector pointing from the negative charge toward the positive charge.

Given, q1 = - 4.5 nCq2 = + 4.5 nC

The displacement between the two charges is, d = 3.1 × 10^-3m,

as they are separated by 3.1mm.

Substituting the values,`p = q2d - q1d``= (4.5 × 10^-9C)(3.1 × 10^-3m) - (-4.5 × 10^-9C)(3.1 × 10^-3m)`= 2 (4.5 × 10^-9C)(3.1 × 10^-3m)= 2.79 × 10^-11C.m

Direction of the electric dipole moment is along the direction of the displacement vector. Therefore, it is from a negative charge to a positive charge.

(b) The torque exerted on a dipole is given by,`τ = pE sinθ`where p is the electric dipole moment, E is the electric field vector, and θ is the angle between the direction of p and E.

Given,τ = 7.2 × 10^-9N.mθ = 36.9°E is the electric field vector whose direction makes an angle of 36.9° with the line connecting the charges.

The component of E along the direction of p is given by,

E cosθ = E . (d/|d|) = E . cos(180°) = - E Component of E perpendicular to the direction of p is given by,

E sinθ = E . sin(36.9°)

Therefore, torque can be written as,`τ = pE sinθ``⇒ E = τ/(p sinθ)``= (7.2 × 10^-9 N.m) / (2.79 × 10^-11 C.m) sin 36.9°`= 8.5 × 10^4 N/C

Therefore, the magnitude of the electric field vector is 8.5 × 10^4 N/C.

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By Using Euler's method with two steps, we can find the approximate value of Y(2) is 2.125. , where Y is the solution of the initial value problem dy/dx = x - y, and Y(1) = 3.

Euler's method is defined as a numerical technique which is  used to approximate solutions into ordinary differential equations. The method includes dividing the interval of interest into smaller steps and thereafter approximating the solution at each step by using the derivative of the function.

In this case, we are given the initial value problem dy/dx = x - y, with the initial condition Y(1) = 3. To approximate Y(2) using Euler's method with two steps, we will divide the interval [1, 2] into two equal steps.

Step 1:

We start with the initial condition Y(1) = 3. Using the differential equation dy/dx = x - y, we can approximate the value of Y at the midpoint of the interval [1, 2].

Using the step size h = (2 - 1) / 2 = 0.5, we can calculate Y(1.5) as follows:

Y(1.5) ≈ Y(1) + h × (x - y) = 3 + 0.5 × (1.5 - 3) = 3 + 0.5 × (-1.5) = 2.25

Step 2:

Now, using the value of Y(1.5) as the new approximation, we calculate Y(2) using the same process:

Y(2) ≈ Y(1.5) + h × (x - y) = 2.25 + 0.5 × (2 - 2.25) = 2.25 + 0.5 × (-0.25) = 2.125

Thus,  by using Euler's method with two steps, the approximate value of Y(2) is 2.125.

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The complete question is

Use Euler's Method With Two Steps To Approximate Y(2), Where Y Is The Solution Of The Initial Value Problem: Dy : X − Y, Y(1) = 3

Answer:

70m/s2

Explanation:

acceleration is equal to force over mass,

a=4200/60

= 70m/s2

Answer:

Maybe A. waving your arms?

Answer:

80 m tall

Explanation:

*** EDITED ***      (I left out the '1/2' in the equation....D'Oh!)

It was descending 4 seconds  ...because it landed 20 m away  (at 5 m/s  ...so 4 seconds)

displacement = 1/2   a t^2

                        = 1/2 * 10 ( 4)^2 = 80 m  tall

The statement illustrates how engineering has influenced society in that People want the cameras in their cell phones to be able to capture high-resolution images. Option C is corect.

A digital camera that creates pictures that can be saved on a computer and seen on a screen.

People want their mobile phone cameras to be able to take high-resolution pictures, which shows how engineering has affected society.

Statement B illustrates how engineering has influenced society.

Hence option C is correct.

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Answer:

Stars that are more than 40 times more massive than our Sun, cannot expand into a red supergiant. This is because they burn too quickly and lose their outer layers fast. They will reach the blue supergiant stage, or perhaps yellow hypergiant, before returning to become hotter stars.

Explanation:

Answer:

Cause there bigger so they have a more hotter surface.

A non-rotating frame of reference placed at the center of the sun is not exactly inertial due to the non-uniform distribution of mass and the resultant gravitational forces acting on it.

An inertial frame of reference is a frame in which the law of inertia holds. This means that an object that is not acted upon by any force should remain at rest or move in a straight line at a constant speed. However, in reality, finding a perfectly inertial frame is difficult, and most frames of reference experience some form of non-inertial effect.

In the case of a non-rotating frame of reference placed at the center of the sun, it is very nearly an inertial frame. However, it is not exactly an inertial frame due to the gravitational forces acting on it. Gravitational forces arise from the presence of mass in a space-time, and in this case, the frame of reference placed at the center of the sun is experiencing a gravitational force from the sun. Since gravity is a non-inertial force, the frame of reference is not exactly inertial.

The gravitational force experienced by the frame of reference is due to the sun's mass and affects the frame's acceleration. In this case, the acceleration is not constant, and it changes based on the location of the frame of reference. This effect is known as the tidal force, and it leads to a non-uniform distribution of mass in the frame of reference. Thus, this non-uniform distribution of mass causes the frame of reference to be non-inertial.

In summary, even though a non-rotating frame of reference placed at the center of the sun is very nearly an inertial frame, it is not exactly inertial due to the non-uniform distribution of mass and the resultant gravitational forces acting on it.

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Answer:

special Olympics its the correct answer

Answer:

A voltmeter measures electric potential in volts.

An electrometer is used to detect and measure static electricity.

Explanation:

The main difference between a voltmeter and an electrometer is their sensitivity and the range of measurements they can take. A voltmeter is used to measure the voltage or potential difference between two points in a circuit, while an electrometer is used to measure small electric charges or potential differences.

A voltmeter is a type of electrical meter that measures the voltage or potential difference between two points in a circuit. It is typically less sensitive than an electrometer, and is designed to measure larger voltages, typically in the range of 1 volt to several thousand volts.

An electrometer, on the other hand, is a type of electrical meter that is designed to measure small electric charges or potential differences. It is much more sensitive than a voltmeter and can measure voltages as low as a few microvolts or even less.

Electrometers are typically used in scientific and research applications, where small charges or potential differences need to be measured accurately.

In summary, the main difference between a voltmeter and an electrometer is their sensitivity and the range of measurements they can take. A voltmeter is used to measure larger voltages, while an electrometer is used to measure small electric charges or potential differences.

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The star is moving away from Earth at a velocity of 1.8 x 106 m/s.

The Doppler Effect describes the shift in wavelength of a wave when the source is moving in relation to the observer. The shift can be observed in sound waves, light waves, and other waves.

The Doppler Effect can be used to determine the velocity of objects moving away from an observer, as in the case of stars moving away from Earth.

The velocity of a star moving away from Earth can be determined using the equation:

v = Δλ/λ x c, Where v is the velocity of the star, Δλ is the shift in wavelength of the spectral line, λ is the wavelength of the spectral line measured in the lab on Earth, and c is the speed of light (3.00 x 108 m/s).

In this case, the shift in wavelength of the spectral line is Δλ = 500.3 nm - 500 nm = 0.3 nm.

The wavelength of the spectral line measured in the lab on Earth is λ = 500 nm.

Plugging in these values to the equation above: v = Δλ/λ x cv = (0.3 nm / 500 nm) x (3.00 x 108 m/s) = 1.8 x 106 m/s.

Therefore, velocity of star 1.8 x 106 m/s.

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Adding additional components to a circuit gives the impression that the battery is a source of consistent voltage.

A battery is typically considered to be a source of constant voltage, meaning that it maintains a fixed potential difference between its terminals, regardless of the elements that are added to the circuit. However, the current supplied by the battery may vary depending on the resistance of the circuit and the characteristics of the elements that are added. Ohm's Law states that the current in a circuit is directly proportional to the voltage and inversely proportional to the resistance. Therefore, adding elements with higher resistance to the circuit will result in a decrease in the current supplied by the battery.

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