A race car is one lap behind the lead race car when the lead car has 52 laps to go in a race. If the speed of the lead car is 56.3 m/s, what must be the average speed of the second car to catch the lead car just before the end of the race, assume 1 lap is 1.34km

The explanation of how the natural world works based on experimentation is ;A theory ( D )

A theory is proportionally related to an experiment because a theory is an informed /phenomenon based on facts approved or disproved by an experiment.

Therefore an explanation of how the natural world works should be factual based on experimentation. and not an opinion, while a law in science is developed based on ideal conditions and not natural world conditions.

Hence we can conclude that The explanation of how the natural world works based on experimentation is A theory.

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The symbols that completes the given nuclear equation are written as follows:

An alpha decay can be defined as a type of radioactive decay in which the atomic nucleus of a radioactive element emits an alpha particle, thereby, producing chemical elements with a different atomic nucleus.

During an alpha decay, the radioactive element has a mass number that is decreased by four (4) and an atomic number that is decreased by two (2), which is typically an atom of Helium (⁴He₂).

A beta particle can be defined as an isotope which typically undergoes radioactive decay through the emission of a radiation with a -1 charge. This ultimately implies that, an atom of neutron becomes a proton and an electron (₀e⁻¹) and an atom of proton also becomes a neutron and a positron (⁰⁻e₁⁺) during beta decay.

In conclusion, the symbols that completes the given nuclear equation are written as follows:

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Gravitational force is not related to other force because it is related to gravity.

Electrostatic force and magnetic force are link to each other because both have charges. Electrostatic force is type of force that is present between two electrically charged particles. They can either be a repulsive or attractive force.

So we can conclude that Gravitational force is not related to other force because it is related to gravity.

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Two or more physical objects which are in contact with each other exert forces on each other. Here the tension of the cable is  16349.96 N.

The force along the length of a medium especially a force carried by a flexible medium, such as a rope or cable is defined as the tension. The tension on an object is equal to the product of the mass of the object and the gravitational force added and acceleration.

T = mg + ma

Here W = mg

W = 1000.0 × 9.81 = 9810

using geometry,

tan α = 3/4

α = 36.87°

Tsinα = W

T sin36.87° = 9810

T = 16349.96 N

Thus the tension of the cable is 16349.96 N.

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The estimated enthalpy change (ΔH) for the reaction is 101 kJ/mol. The negative sign shows that the reaction is exothermic.

The overall reaction is:

CH₄ + Cl₂ → CH₃Cl + HCl

Bond energies:

BE(C-H) = 414 kJ/mol

BE(C-Cl) = 326 kJ/mol

BE(H-Cl) = 432 kJ/mol

BE(Cl-Cl) = 243 kJ/mol

Now, let's calculate the enthalpy change (ΔH) for the reaction:

ΔH = (ΣBE) - (ΣBE)

ΔH = (BE(C-H) + BE(Cl-Cl)) - (BE(C-Cl) + BE(H-Cl))

ΔH = (414 + 243) - (326 + 432l)

ΔH = -101 kJ/mol

Therefore, The estimated enthalpy change for the reaction is 101 kJ/mol. The negative sign shows that the reaction is exothermic.

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The acceleration of the block is 6.4 m/s².

To calculate the acceleration of the block, we need to consider the forces acting on it.

The applied force is 40 N, and since it is the only horizontal force in the direction of motion, it is the net force acting on the block.

The frictional force opposing the motion is 8 N.

The acceleration, we can use Newton's second law, which states that the net force acting on an object is equal to its mass multiplied by its acceleration (F = ma).

The net force is the difference between the applied force and the frictional force:

40 N - 8 N = 32 N.

Now, we can plug the values into Newton's second law:

32 N = 5 kg × a.

Solving for the acceleration (a), we get

a = 32 N / 5 kg

a = 6.4 m/s².

Therefore, the acceleration of the block is 6.4 m/s².

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Answer:

If we want to change the kinetic energy of a massive object, we must do work on it. For example, in order to lift a heavy object, we must do work to overcome the force due to gravity and move the object upward. If the object is twice as heavy, it takes twice as much work to lift it the same distance.

Explanation:

Open clusters, O and B stars, globular clusters and gas and dust lie in the halo of our galaxy, therefore the correct option is (E) all of the above

The halo of our galaxy contains a diverse array of objects, including open clusters, O and B stars, globular clusters, and gas and dust. Open clusters are groups of relatively young stars that formed from the same molecular cloud, while globular clusters are much older and contain hundreds of thousands of stars.

O and B stars are massive, hot stars that emit large amounts of ultraviolet radiation, which can ionize surrounding gas clouds. Gas and dust in the halo can form new stars or be illuminated by nearby stars, producing emission nebulae and other interesting structures.

Therefore, the correct option is (E) all of the above

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Answer:

shirt is little attached to the body, it can come off and fly away

Explanation:

In electrostatics, charges of different signs attract and charges of the same sign repel.

In this case, when a negative charge is placed on it, both the inventor and the shirt are charged, therefore there is a repulsive force, also there is an attraction between the positive charge of the roof attracts the negative charge, such as the shirt. of weak the two forces not greater than the resistance of the walk.

As the shirt is little attached to the body, it can come off and fly away

Answer:

between car tires and a road

Explanation:

Answer:

b

kakanandnanjsnMajdnAnnznnzkkzid

Answer:

Frequency

Explanation:

I just took that test

The radioactive decay equation is \(Th^{232} - > Ra^{228} + He^{4}\). The activity of 10 g of thorium, calculate the initial activity using the decay constant and the number of nuclei.  the activity after 10 years, use the radioactive decay law with the appropriate values.

a) The radioactive decay equation for thorium-232 (\(Th^{232}\)) can be represented as follows:

\(Th^{232} - > Ra^{228} + He^{4}\)

In this equation, thorium-232 decays into radium-228 and emits an alpha particle (helium-4 nucleus). This decay process occurs spontaneously over time.

b) To find the radioactive radiation activity of 10 g of thorium, we need to use the concept of activity, which represents the rate of decay of radioactive material. The activity (A) is given by the equation:

A = λ * N

Where λ is the decay constant and N is the number of radioactive nuclei present. The decay constant is related to the half-life (T1/2) of the isotope by the equation:

λ = ln(2) / T1/2

For thorium-232, with a half-life of 1.4 * \(10^{10}\) years, the decay constant is approximately λ = ln(2) / (1.4 * \(10^{10}\) years).

To find the number of radioactive nuclei (N) in 10 g of thorium, we can use Avogadro's number and the molar mass of thorium-232. The molar mass of thorium-232 is 232 g/mol, so we have:

N = (10 g) / (232 g/mol) * (6.022 * \(10^{23}\)nuclei/mol)

Now, we can calculate the activity (A) by substituting the values into the equation A = λ * N.

c) To find the activity after 10 years, we need to consider the radioactive decay law, which states that the activity of a radioactive substance decreases exponentially over time. The equation for the remaining activity (A_t) after time t is given by:

A_t = A_0 * e^(-λ * t)

Where A_0 is the initial activity at t = 0.

By substituting the appropriate values into the equation, including the initial activity calculated in part b, we can determine the activity after 10 years.

In summary, to find the radioactive radiation activity of thorium-232, we use the decay equation, the concept of activity, and the radioactive decay law. By applying these principles, we can calculate the initial activity of 10 g of thorium and determine the activity after a specified time, such as 10 years.

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Answer:

161,000 cm

Explanation:

1 mi × (1.61 km/mi) × (1000 m/km) × (100 cm/m) = 161,000 cm

The useful range of object distances of the lens is 1.05 m and 6.3 m.

Focal length of the camera = 175 mm

Distance of Image 1 = i₁ = 180 mm

Distance of Image 2 = i₂ = 210 mm

Since the distance between the images is positive, hence we get real images.

Using thin lens equation,

= (1/f) = (1/i) + (1/o)

For image 1,

= (1/o₁) = (1/f) - (1/i₁)

= (1/o₁) = (1/175) - (1/180)

= o₁ = 6299.4 mm = 6.3 m

Similarly for image 2,

=  (1/o₂) = (1/f) - (1/i₂)

=  (1/o₂) = (1/175) - (1/210)

= o₂ = 1050 mm = 1.05 m

Thus, any object between 1.05 m and 6.3 m will be useful.

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Answer:

4

Explanation:

if there are 1/4 cups and you need to fill a cup, you need 4
4 x 1/4 = 4/1
4/1 = 1

Answer:

Ask a question.

Explanation:

Your question is the basis of any theory.

When it is dropping into the sand point the energy of the ball transform from potential energy to kinetic energy.

The energy of motion is known as kinetic energy, and it is manifested in the motion of a particle, an object, or a collection of particles. Any object that moves, such as a person walking, a ball being thrown, food falling from a table, or a charge particle in an electric field, utilizes kinetic energy.

Radiant, thermal, auditory, electrical, and mechanical kinetic energies are the basic categories. Gamma radiation and ultraviolet light, which are constantly travelling through the universe, are instances of radiant energy. Sound energy is kinetic energy that manifests as vibrations, such as when someone plays the drums

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Answer:

9.8 N downward

Explanation:

The weight force is defined as w = mg, where m is the mass of the object and g = 9.8 m/s^2. Plugging in values shows that the force exerted on the ball is 9.8 N, downwards toward the ground.

Answer:

Explanation:

The first mass is moving at a velocity v towards the second, \(\frac{3}{2} mv\) is stationary.

impulse imported to cart 1 = change in momentum

=|ΔP| = \(p_{f}\) - \(p_{i}\)

=m(\(\frac{-v}{2}\)) - (mv)

=\(\frac{-3}{2} mv\)

Magnitude of impulse = \(\frac{3}{2} mv\)

Velocity is the direction at which an object is moving and serves as a measure of the rate at which its position is changing as seen from a specific point of view and as measured by a specific unit of time (for example, 60 km/h northbound). In kinematics, the area of classical mechanics that deals with the motion of bodies, velocity is a fundamental idea.

A physical vector quantity called velocity must have both a magnitude and a direction in order to be defined. Speed is the scalar absolute value (magnitude) of velocity; it is a coherent derived unit whose quantity is measured in metres per second (m/s or m/s1) in the SI (metric system). In contrast to "5 meters per second east," which is a vector, "5 meters per second," for instance, is a scalar.

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Answer:

Option 2

Explanation:

Since they want to know kinetic energy being increased, it cannot be Options 1 or 3. So now we're left with 2 and 4. 4 seems to be decreasing, so we can eliminate that. So, our answer is Option 2.

Law of Reflection :

The law of reflection states that when light rays strike a smooth surface, the angle of reflection equals the angle of incidence, and the incident ray, reflected ray, and normal to the surface all lie in the same plane.

Here, let us consider, the ray A as the normal , as it is perpendicular to the surface of the plane mirror. When the incident ray hits the plane mirror at an angle say, θ  with the normal ( here, incident ray A) , then, θ will be  the angle of reflection.

Now if we consider all the incident rays A, B, C and D. Among them, let the ray C  make an  angle  Θ, with the normal ( here, incident ray A).

Therefore, from the image given, clearly,  θ = Θ, hence Θ is the angle of reflection, thus ray C best represents the reflected ray.

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Answer:

Simple as 50 km/h

Explanation:

Since the average being measured is of the hours and not distance, it is simply (60+40)/(2+2)

Answer:

Surface 1 is blacktop, Surface 2 is gravel, and Surface 3 is ice.

Explanation:

Hope this helps! :]

Answer:

C. Surface 1 is blacktop, Surface 2 is gravel, and

Surface 3 is ice.

Explanation:

As mentioned in the video lecture, the heat transfer problem to find the unknown thermal conductivities of the rods in our experiment can be approximated as 1-Dimensional heat conduction along the axis of the rods (or radial direction for a solid disc experiment) and Transient heat conduction.

The correct option is:1

Dimensional heat conduction along the axis of the rods (or radial direction for a solid disc experiment)Transient heat conduction.Thermal conductivity is a characteristic of a material that determines how easily heat can pass through it. We will use a simple model for the heat transfer that occurs in this experiment. It is a 1-Dimensional heat conduction along the axis of the rods (or radial direction for a solid disc experiment).

Heat will flow from the hotter end to the colder end of the rods, and the thermal conductivity of the rods can be calculated by measuring the temperature profile along the length of the rods over time.This model is valid only if the heat transfer is steady-state, and if the thermal properties of the material are constant, such as thermal conductivities. However, in our experiment, the heat transfer is not steady-state but transient. This means that the temperature distribution along the length of the rods will change with time.

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Answer:

(a) The research method that would be used to test this theory is an experimental method.

(b) The independent variable would be the amount of time participants spend watching cooking shows on television, and the dependent variable would be their cooking ability. Cooking ability can be measured by objective measures such as speed and accuracy in preparing dishes, as well as subjective measures such as taste and presentation.

(c) One potential confounding variable could be prior cooking experience. Participants with prior cooking experience may have a higher cooking ability regardless of the amount of time they spend watching cooking shows, whereas those without prior cooking experience may have a lower cooking ability regardless of the amount of time they spend watching cooking shows. To control for this variable, participants could be randomly assigned to groups based on their prior cooking experience, or prior cooking experience could be measured and included as a covariate in the analysis.

Explanation:

a. The statement is false because induced emf (electromotive force) is proportional to the rate of change of magnetic field.

b. The statement is true because the phenomenon of self-induction, where a changing current in a coil produces a magnetic field that induces an emf in the same coil.

c. The statement is true because Lenz's law, which states that the direction of the induced emf is always such that it opposes the change in magnetic flux that produced it

d. The statement is true because the battery provides a potential difference that drives the flow of charge (i.e., current) through the coil.

The four statements presented relate to the fundamental concepts of electromagnetism. Statement (a) is false, as the energy of a magnetic field is proportional to the square of the field strength, not the rate of change. Statement (b) is true, as when a current is switched on in a coil, it generates a changing magnetic field that induces an electromotive force (emf) in the coil.

Statement (c) is also true, as an inductor resists changes in current flow, so when the current changes, the magnetic field around the inductor changes as well, generating an emf with an opposite polarity to the current that caused the change. Finally, statement (d) is true, as a changing magnetic field creates an electric field that can cause current to flow in a conductor. Therefore, the instant a coil is connected to a battery, current flows due to the potential difference created by the battery, and a magnetic field builds up around the coil.

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Answer:

  (D) 4×10⁻³

Explanation:

The difference is ...

  0.2050 -0.2014 = 0.0036 = 3.6×10⁻³

The number 0.205 is expressed to a precision of 1×10⁻³, so the result of the subtraction operation cannot be considered to be more precise. It must be expressed as ...

  4×10⁻³ . . . . matches choice D

_____

Additional comment

This is physics, not math. In the physical sciences, most numbers must be considered to be measurements. (A few are definitions.) Hence, the rules of significant figures and precision apply to the results of arithmetic operations. This problem is a good illustration of what happens when computing small differences of large numbers. We start with 3 significant figures in 0.205, and end up with 1 significant figure in 0.004.

The cost of running the refrigerator for 30 days is 18.72 dollars.

The energy usage of a refrigerator with a 1000 W compressor that runs only 20% of the time is to be calculated in dollars per kWh, as electricity costs 0.13 dollars/kWh.SolutionThe energy consumption of a refrigerator can be determined by calculating the energy consumed over time. Let's assume that electricity costs 0.13 dollars/kWh.Cost of running the refrigerator in 1 hour = 0.13 * 1kW = 0.13 dollars

Since the compressor only runs 20% of the time, its running time will be 0.2 * 1 hour = 0.2 hoursThe energy used by the refrigerator in 30 days is the product of energy used per hour and the number of hours in 30 days. There are 24 hours in a day, so there are 24 * 30 = 720 hours in 30 days.

Cost of running the refrigerator in 0.2 hours = 0.13 * 1kW * 0.2 = 0.026 dollars

Cost of running the refrigerator in 30 days = 720 * 0.026 dollars= 18.72 dollars

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Answer:

Una rueda tiene 4 cm de diametro y realiza 200 vueltas cada 4 minutos calcular a frecuencia b el periodo c la velocidad lineal l tangencial