Humans convert approximately ________ of the energy stored in food to useful work

The rate constant for the reaction is approximately 0.0169 min⁻¹. Rounded to two significant figures, this is equivalent to 1.7 × 10⁻² min⁻¹, which is closest to option C (3.3 × 10⁻² min⁻¹).

The integrated rate law for a first-order reaction is:

ln([A]/[A]₀) = -kt

where [A]₀ is the initial concentration of A, [A] is the concentration of A at time t, k is the rate constant, and ln is the natural logarithm.

Since the reaction is 25% complete at 42 min, the concentration of A at that time is 75% of the initial concentration:

[A]/[A]₀ = 0.75

Taking the natural logarithm of both sides of this equation gives:

ln([A]/[A]₀) = ln(0.75)

Substituting this expression and the given time into the integrated rate law gives:

ln(0.75) = -k(42 min)

Solving for k, we get:

k = -ln(0.75)/42 min

k ≈ 0.0169 min⁻¹

Therefore, the rate constant for the reaction is approximately 0.0169 min⁻¹. Rounded to two significant figures, this is equivalent to 1.7 × 10⁻² min⁻¹, which is closest to option C (3.3 × 10⁻² min⁻¹).

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The correct answer is(b). There is a physical change from the solid state to a gas state where energy between the molecules increases.

During sublimation, carbon dioxide transitions directly from the solid state (dry ice) to the gas state without passing through the liquid phase. In this process, individual molecules of carbon dioxide gain energy from the surroundings, leading to an increase in their kinetic energy and molecular movement.

As a result, the carbon dioxide molecules separate from each other and form a gas. This phase change is considered a physical change rather than a chemical change since the chemical composition of carbon dioxide remains the same throughout the process.

Therefore, the sublimation of carbon dioxide results in a physical change where the molecules transition from the solid state to the gas state, gaining energy and increasing their molecular movement.

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Proton route curvature has a 9.9mm radius of curvature.

Magnitude is simply "distance or amount," according to the definition given in physics. It shows how an item moves while it is in motion, whether that movement is absolute, relative, or of a certain magnitude. It serves as a method to convey something is really size and scope. Magnitude is a broad term used in physics to describe size or distance.

Size can be described as magnitude. A automobile is travelling quicker than a bike, for instance, in terms of speed. The automobile is now moving faster than the bike in this situation by a significant margin. It communicates the absolute size or direction.

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Answer:

They are provided with keen senses of sight, smell and hearing.

Answer:

Terrestrial animals

The amount of wavelength of light thick is the thumbnail x/y.

Given:

Wavelength of light= x

Thickness of thumbnail= y

The amount of wavelength thick the thumbnail is x/y

What is wavelength?

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Scientists believe that a long time ago the seven continents might have been connected, but they think the plates shifted apart at some point.

Answer:

The bonds can shift because valence electrons are held loosely and more freely

Explanation:

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Answer:

The bonds can shift because valence electrons are held loosely and move freely.

Explanation: got it right

The temperature change that occurred when the 1 m long brass experience an increase in length of 5.757 mm is 303 °C

Coefficient of linear expansion is given by the following formula:

α = ΔL / L₁(ΔT)

Where

With the above formula, we can obtain the temperature change as illustrated below:

α = ΔL / L₁(ΔT)

0.000019 = 5.757 / (1000 × ΔT)

Cross multiply

0.000019 × 1000 × ΔT = 5.757

0.019 × ΔT = 5.757

Divide both sides by 0.019

ΔT = 5.757 / 0.019

ΔT = 303 °C

Thus, we can conclude that the temperature change is 303 °C

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The Mach number for the plane is approximately 3.51.

To find the speed of the plane, we can use the equation:

Speed of sound = Speed of the plane / Time taken

Given: Speed of sound (v) = 344 m/s

Time taken (t) = 3.51 seconds

Let's calculate the speed of the plane:

Speed of plane = Speed of sound × Time taken

Speed of plane =\(344 m/s * 3.51 s\)

Speed of plane ≈ 1206.44 m/s

Rounded to 2 decimal places, the speed of the plane is approximately 1206.44 m/s.

To find the Mach number of the plane, we need to divide the speed of the plane by the speed of sound:

Mach number = Speed of plane / Speed of sound

Mach number ≈ \(1206.44 m/s / 344 m/s\)

Mach number ≈ 3.51

Rounded to 2 decimal places, the Mach number for the plane is approximately 3.51.

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Answer is the hind brain

The brainstem is located under the forebrain and midbrain. Therefore option D is correct.

The brainstem is located under both the forebrain and midbrain. It is a vital component of the central nervous system that connects the brain to the spinal cord and controls many essential functions such as breathing, heart rate, and digestion.

It consists of three main regions: the medulla oblongata, pons, and midbrain. The forebrain, midbrain, and hindbrain together constitute the major divisions of the brain.

The hindbrain is positioned below the midbrain and includes structures like the cerebellum, pons, and medulla oblongata.

The brainstem, specifically its lower regions, is responsible for relaying information between the brain and the rest of the body while regulating critical bodily functions.

Therefore option D is correct.

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Because ultraviolet light may be absorbed by the filler substance, but not by the lamp's light. Because UV light extracts energy from the filler substance while lamp light does not.

Ultraviolet Rays in the electromagnetic Spectrum Ultraviolet rays are a kind of electromagnetic radiation that extends from the visible light spectrum to the X-ray area.

Harmful rays have a long-term effect on humans, causing skin and eye problems. It is also a source of Vitamin C.

Because ultraviolet light may be absorbed by the filler substance, but not by the lamp's light. Because UV light extracts energy from the filler substance while lamp light does not,

Hence light from the ultraviolet flashlight harden the filling when light from the lamp does not.

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Answer:

\(f_n_e_t=0\)

Explanation:

\(f_1+f_2=f_n_e_t\)

because there are two different forces in different directions (left: negative, right: positive, down: negative, up: positive) so 60N left will be negative, and 60N right will be positive:

\(60+(-60)=0\)

when two same forces apllied then the net force is zero.

Answer:

Downwards

Explanation:

Using Fleming's right hand rule, where the middle finger represents the negative charge moving in the south to north direction, the fore finger represents the magnetic field which points in the east to west direction.

If we are to follow this orientation and place the thumb, middle finger and fore-finger at right angles to each other, the thumb represents the direction of the magnetic force on the charge.

In this case, the magnetic force points downwards after setting the other orientations of the magnetic field and the negative charge's direction.

Answer:   B

Explanation:

The friction force is less than the tension force

The amount of charge that passes through a 3.0 amp television in 1.3 hours would be 14040 Coulombs.

I = Q / T

Let us first convert the time period of hours into seconds

1 hour = 3600 seconds

1.3 hours = 1.3 × 3600 seconds

              =  4680 seconds

By using the above relation between electric current and electric charge

and by substituting the respective values of the charge and the time period

I = Q / T

3 = Q / 4680

Q = 3 × 4680

  = 14040 Coulombs

A charge is a fundamental property of matter that describes the amount of electric charge a particle possesses. Charged particles, such as electrons and protons, interact with each other through electromagnetic force, which is one of the four fundamental forces of nature. The charge can be either positive or negative, and opposite charges attract while like charges repel.

A charge is conserved, which means that the total amount of charge in a closed system remains constant. This conservation law is an essential principle in many areas of physics, including electromagnetism, quantum mechanics, and particle physics. The charge also plays a significant role in electrical phenomena, including circuits, electric fields, and electromagnetic radiation. It is essential to understand the charge and its properties to comprehend many aspects of the physical world around us.

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Answer:

An object will not move unless acted upon by an unbalanced force.

Explanation:

Since Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

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According to Newton's law of motion an object will at a state unless and until a force act upon it. Hence, force is an external agent which change the state of an object.

Newton proposed three laws of motion explaining the motion an object. The first law states that an object will continue at the state of motion or rest unless a force acting on it.

Therefore force is an external agent which acts on a body to change it from the state of rest or motion. Force is directly proportional to the mass of the body. Hence, greater the mass, greater force must be applied to change its state.

The first of motion is called law of inertia, where inertia is the tendency of a body to stay in a state. Therefore, force changes this tendency of an object.

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The percent error associated with this experiment is 3.27%.

The mechanical equivalent of heat, J (Joules) = 4,049 m.

Actual value of mechanical equivalent of heat, J (Joules) = 4,186 m.

Percentage error = ((theoretical value - experimental value) / theoretical value) × 100.

Where; theoretical value = Actual value of mechanical equivalent of heat, J (Joules) = 4,186 m.

experimental value = The mechanical equivalent of heat, J (Joules) = 4,049 m.

Substitute the values; Percentage error = ((4,186 - 4,049) / 4,186) × 100= 3.27%

Therefore, the percent error associated with this experiment is 3.27%.

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First, let's calculate the particle acceleration, using the formula below:

Now, to find the force applied, let's use the second law of Newton:

Therefore the value of F is 0.08 N.

Answer:

=> Rheostat is an electric device used as a variable resistance, like the regulator of the fan. It is used to change the electric resistance in the electric circuit.

=> Rheostat works on the principle of Ohm’s law. Ohm’s law states that current in a circuit is inversely proportional to the resistance at the given temperature.

\( \infty \infty \infty \)

Answer:

Outside the edges of the solar system.

That's not a simple question, and it doesn't have a simple answer.

The two Voyager spacecraft have been flying for about 43 years now.

They left the "heliosphere" about 2 years ago (in November 2018), and are now about 10.9 billion miles from Earth.

Mission controllers can still communicate with them, but it takes radio signals almost 17 hours to reach either one of the spacecraft from Earth.

(And another 17 hours if it has anything to answer back.  That's a day and a half to do a "How are you ?" . . . . . "I'm OK.".)

But wait !  

The boundary of the solar system is considered to be beyond the outer edge of the "Oort Cloud", a collection of small objects that are still under the influence of the Sun's gravity. The thickness of the Oort Cloud is not exactly known, but it's estimated to begin at about 93 billion miles from the Sun, and to extend maybe as far as 9,300 billion miles from the sun.  It will take about 300 years for Voyager 2 to reach the inner edge of the Oort Cloud and possibly 30,000 years to fly beyond it.

So even though the Voyager spacecraft are the farthest man-made objects away from Earth, and have been sailing along for 43 years, neither of them is anywhere near leaving the solar system yet.

Yes, we've sent artificial probes past the Sun, the Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, several asteroids, several comets, and past the Kuiper belt, we're still thousands of years from leaving the solar system, and millions of years from reaching the next nearest star ... even if the Voyagers don't get pulverized into dust by meteoroids and radiation before they get there.

Answer:

1.03 * 10^-5

Explanation:

The magnetic flux through the loop is approximately 1.317 × \(10^{(-5)\)T·m².

To calculate the magnetic flux through a loop, we use the formula:

Φ = B × A × cos(θ)

Where:

Φ is the magnetic flux

B is the magnetic field strength

A is the area of the loop

θ is the angle between the magnetic field and the normal to the loop

Given:

Magnetic field strength (B) = 3.09 × \(10^{(-4)\) T (east direction)

Area of the loop (A) = 0.0471 m²

The loop faces directly northeast

To find the angle θ,  determine the angle between the magnetic field direction (east) and the normal to the loop (northeast).

Since the loop faces northeast, the angle between the normal to the loop and the east direction is 45 degrees (90 degrees divided by 2).

Now calculate the magnetic flux:

Φ = B  × A  × cos(θ)

Φ = (3.09 × \(10^{(-4)\) T) × (0.0471 m²) × cos(45°)

Using the value of cos(45°) as 0.7071:

Φ = (3.09 × \(10^{(-4)\) T) × (0.0471 m²) ×0.7071

Φ = 1.317 × \(10^{(-5)\) T·m²

Therefore, the magnetic flux through the loop is approximately 1.317 × \(10^{(-5)\) T·m².

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The magnitude of the average voltage induced in the coil is 12.5 volt.

It is the creation of a potential difference in a coil as a result of variations in the magnetic flux flowing through it. To put it another way, it is said that electromotive force, or EMF, is created when the flux connecting with a conductor or coil changes.

Given that: a circular coil with an area of 0.0500 m^2 is wrapped with 500 turns of wire and the magnetic field changes in value from -0.100 T to 0.150 T in an interval of 0.500 s.

Hence, the magnitude of the average voltage induced in the coil is =

N ( B₂ - B₁) A/t

= 500(0.150 - (-0.100))0.0500/0.500 volt.

= 12.5 volt.

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When the light is reflected by denser medium there 180° phase change of wavelength in each reflected light compared to the incident light wave.

The light wave is travelling from air first reflected by film coating. So there is 180° phase change of wavelength in the reflected light from the front of the film.

Again at refracted part of the light travels through film coating and reflected by front of the glass so again there is 180° phase change of wavelength in reflected light from the glass.

So, there is total of 360° phase change or practically zero phase change of wavelength between the reflected light.

This change of phase will change the wavelength of the light wave.

Therefore, the next smallest wavelength will be in the first half of the phase change.

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As the car begins to move forward out of the mud, the force of the car on the rope is equal to the force of the rope on the car.

Explanation: When the car is stuck in the mud and you apply force to move it forward, there is tension in the rope connecting the car and the object you are using to pull it. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. In this case, when you pull the car forward with a force, the car exerts an equal and opposite force on the rope. This means that the force of the car on the rope is equal to the force of the rope on the car. In summary, when the car begins to move forward out of the mud, the force of the car on the rope is equal to the force of the rope on the car. This is because of Newton's third law of motion, which states that every action has an equal and opposite reaction.

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Answer:

erosion

muddy water and soil being carried away by a fast-moving river is erosion

Answer: UV rays, either from the sun or from artificial sources like tanning beds, can cause sunburn. Exposure to UV rays can cause premature aging of the skin and signs of sun damage such as wrinkles, leathery skin, liver spots, actinic keratosis, and solar elastosis. UV rays can also cause eye problems.

Explanation: Uv means ultraviolet

Answer:

One that we describe using our 5 senses

Explanation:

A physical property describes something we can physically observe.

Answer: The charges must be like charges (both positive or both negative).

Explanation:

The amount of thermal energy required to increase the temperature of a 20g sample of copper from 20°C to 50°C is 231 J.

The entire quantity of kinetic energy found in the particles of an object or material is referred to as thermal energy. It is a type of energy connected to atomic and molecular motion within a substance. Conduction, convection, and radiation are a few examples of mechanisms that can be used to transmit this energy from one item to another. An object's thermal energy content is inversely related to its temperature, with higher temperatures denoting a higher thermal energy content. Through the transformation of heat energy into mechanical energy, thermal energy is employed in a variety of processes, including heating houses, preparing food, and creating electricity.

The amount of thermal energy required to increase the temperature of a substance can be calculated using the following formula:

Q = m x c x ΔT

Where:

Q = amount of thermal energy in Joules (J)

m = mass of the substance in grams (g)

c = specific heat capacity of the substance in J/g°C

ΔT = change in temperature in °C (final temperature - initial temperature)

Using the values given in the problem, we can calculate the amount of thermal energy required to increase the temperature of a 20g sample of copper from 20°C to 50°C:

Q = 20g x 0.385 J/g°C x (50°C - 20°C)

Q = 20g x 0.385 J/g°C x 30°C

Q = 231 J

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The amount of thermal energy required to increase the temperature of a substance can be calculated using the following formula:

Q = m x c x ΔT

Where:

Q = amount of thermal energy in Joules (J)

m = mass of the substance in grams (g)

c = specific heat capacity of the substance in J/g°C

ΔT = change in temperature in °C (final temperature - initial temperature)

Using the values given in the problem, we can calculate the amount of thermal energy required to increase the temperature of a 20g sample of copper from 20°C to 50°C:

Q = 20g x 0.385 J/g°C x (50°C - 20°C)

Q = 20g x 0.385 J/g°C x 30°C

Q = 231 J

Therefore, the amount of thermal energy required to increase the temperature of a 20g sample of copper from 20°C to 50°C is 231 J.