You perform an experiment to measure the speed of a car over time. The
results are shown in the graph below.
Speed (m/s)
30
25-
20
15
10
5
0+
O
5
10
A. 24 m/s
B. 22 m/s
15
Time (s)
What was the speed of the car after 20 seconds?
C. 20 m/s
D. 30 m/s
20
25

Answer:cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc

Explanation:

The displacement of the Usain Bolt will be 100 m if ran a straight path. (There is need to specify the shape of the track, did he return to the initial position?)

Displacement is a vector quantity that measures the overall change in position of an object, from its initial position to its final position.

It is defined as the straight-line distance between the initial and final positions, along with the direction from the initial to the final position.

Δx = x₂ - x₁

where;

Δx =  100 m - 0 m

Δx = 100 m

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60 kg m/s is the answer because you gave it and I thought you are telling ruth also you are a big questioner and also you should check with your doctor and go out and go touch the grass.

The x component of the center mass is 4.64 m.

The x component of the center mass is calculated by applying the following formula as shown below;

X_cm = (m1x1 + m2x2 + m3x3) / (m1 + m2 + m3),

where;

X_cm = (m1x1 + m2x2 + m3x3) / (m1 + m2 + m3)

X_cm = (7 x 0   + 1 x 5  + 10 x 6) / (7 + 1 + 6)

X_cm = 4.64 m

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Neutron star diameter estimated to be between 10 and 20 kilometers (6 to 12 miles), which is extremely small compared to other astronomical objects.

The diameter of a neutron star can vary depending on its mass, rotation, and other properties. However, it is generally estimated to be between 10 and 20 kilometers (6 to 12 miles), which is extremely small compared to other astronomical objects like planets and stars.

Neutron stars are extremely dense and compact objects that form when a massive star undergoes a supernova explosion and its core collapses. This collapse causes the protons and electrons in the star to merge and form neutrons, which results in a neutron star. Because neutron stars are so small and dense, they have very strong gravitational fields and are surrounded by extremely powerful magnetic fields.

While the exact diameter of a neutron star can be difficult to measure, scientists have used a variety of methods to estimate their size, including observations of their rotation and interactions with other objects in space. Despite their small size, neutron stars are incredibly important in the study of astrophysics and have helped scientists to better understand the nature of matter, gravity, and the universe itself.

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Answer:

Explanation:Electric potential of a point charge is V=kQ/r V = k Q / r . Electric potential is a scalar, and electric field is a vector. Addition of voltages as numbers gives the voltage due to a combination of point charges, whereas addition of individual fields as vectors gives the total electric field.

The coefficient of kinetic friction between the block and the surface 0.245.

Friction is a force that opposes relative motion and manifests itself at the interfaces of bodies as well as inside, as in the case of fluids. Leonardo da Vinci was the first to conceive the idea of friction coefficient.

The characteristics of the surfaces, the environment, surface details, the presence of lubricant, etc. all affect how much friction there is between surfaces.

There are a number of theories on what generates static friction, and like other friction-related ideas, each one holds true in some situations but falls short in others.

Therefore, The coefficient of kinetic friction between the block and the surface 0.245.

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The distance over which the force was applied would be 10 meters.

The work done on an object is given by the product of the force applied and the distance over which it is applied. Therefore, we can use the formula:

Work = Force x Distance

We know that the force applied is 50 newtons, and the work done is 5.0 x 10^2 joules. We can rearrange the formula to solve for distance:

Distance = Work / Force

Substituting the values we know, we get:

Distance = (5.0 x 10^2 J) / 50 N

Distance = 10 meters

Therefore, the force of 50 newtons was applied over a distance of 10 meters to do 5.0 x 10^2 joules of work on the object.

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The engine weighs four times as much as a freight car. Therefore, the final velocity following connection is 4 km/h.

v′=m1v1+m2v2m1+m2 m1 is the weight of item 1, v1 is indeed the velocity of the object of item 1, m2 is indeed the mass of argument 2, and v2 is the starting velocity of instrument 2 wherein v' is the final speed of a two objects after they travel as one mass after the collision.

The velocity of the special properties in a head-on object with a projectile that is significantly more massive than target the projectile's speed before and after the contact will be roughly equal, and the projectile's speed will practically remain unaltered.

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Newton's Law of Universal Gravitation says that every particle in the cosmos attracts every other particle with a force directly equal to the product of their masses and inversely proportional to the square of their distance.

To detect the gravitational force of attraction between any two objects, at least one of them on Earth must have an exceptionally massive mass. We cannot detect such forces because no object on Earth has an enormously big mass.

Newton's universal law of gravitation states that all objects attract each other with a force (i) away from directly proportional to the product of their masses and (ii) gravity proportional to the square of the distance between their centers. When considering objects on the surface of the Earth, the force is (iii) directly proportional to the product of the mass of the object and the (iv) acceleration due to (v) smaller at the Earth's surface. Since the Earth is (vi) larger than any object under consideration, the object is drawn (vii) towards the Earth.

The two items in a room do not move towards one other since the gravitational force of attraction between them is extremely minimal due to their modest masses. According to the universal law of gravity, every object exerts a gravitational force on every other thing. The gravitational force is directly proportional to the product of masses and inversely proportional to the square of their distances, according to the universal law of gravitation.

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Complete Question:

Fill in the blanks with the appropriate option:

Newton's universal law of gravitation states that all objects attract each other with a force (i) _____ proportional to the product of their masses and (ii) ____ proportional to the square of the distance between their centers. When considering objects on the surface of the Earth, the force is (iii) _____ proportional to the product of the mass of the object and the (iv) ____ due to (v) _____ at the Earth's surface. Since the Earth is (vi) ____ than any object under consideration, the object is drawn (vii) ______ the Earth.

Options:

acceleration, away from directly, directly, gravity, inversely, larger, smaller, some, toward.

Uniform distribution of charge a) [tex]-1.752 * 10^(-17) C/m[/tex] b) [tex]-4.038 * 10^(-16) C/m^2[/tex] c)  [tex]-6.346 * 10^(-16) C/m^2[/tex] d) [tex]-4.580 * 10^(-13) C/m^3[/tex]

(a) To find the linear charge density along the arc, we divide total charge (-275e) by arc length. Arc length is product of radius (3.85 cm) by the angle (in radians) arc subtends. Convert angle to radians:

[tex]37 degree = (37/360) * 2\pi radians = 0.6435 radians[/tex]

The length of the arc is then:

length = radius x angle = (3.85 cm) x (0.6435) ≈ 2.477 cm

The linear charge density is then:

linear charge density = charge in total / length magnitude = (-275e) / (2.477 cm)

e: elementary charge.

Using charge value:

linear charge density = [tex]-1.752 * 10^(-17) C/m[/tex]

Therefore, linear charge density along the arc is [tex]-1.752 * 10^(-17) C/m.[/tex]

(b) To find the surface charge density over the face of the circular disk, we need to divide the total charge (-275e) by area of disk. Area of face of disk is [tex]\pi[/tex] times radius squared

area =[tex]\pi * (1.85 cm)^2 = 10.78 cm^2[/tex]

The surface charge density is then:

surface charge density = total value of charge / area magnitude = [tex](-275e) / (10.78 cm^2)[/tex]

e: elementary charge.

Using charge value:

surface charge density = [tex]-4.038 * 10^(-16) C/m^2[/tex]

Surface charge density over the face of the circular disk is  [tex]-4.038 * 10^(-16) C/m^2[/tex].

(c) To get surface charge density over sphere surface, we divide total charge (-275e) by sphere surface area:

surface area = [tex]4\pi * (radius)^2[/tex]

The surface charge density:

surface charge density = total charge / surface area =[tex](-275e) / [4\pi * (1.85 cm)^2][/tex]

where e is the elementary charge.

Use charge value:

surface charge density ≈ [tex]-6.346 * 10^(-16) C/m^2[/tex]

Surface charge density over sphere is[tex]-6.346 * 10^(-16) C/m^2.[/tex]

(d) To get volume charge density in the sphere, we divide the total charge (-275e) by the volume of the sphere.

volume = [tex](4/3)\pi * (radius)^3[/tex]

The volume charge density is then:

volume charge density = total charge / volume = [tex](-275e) / [(4/3)\pi * (1.85 cm)^3][/tex]

e: elementary charge

Using value of the elementary charge:

volume charge density = [tex]-4.580 * 10^(-13) C/m^3[/tex]

Therefore, the volume charge density in the sphere is [tex]-4.580 * 10^(-13) C/m^3[/tex]

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The correct order of events to describe how the magnetic field forms around the Earth is: (1). The Earth's liquid iron outer core convects due to heat flow, creating electric currents. (2). The electric currents in the outer core generate a magnetic field. (3). The magnetic field lines extend from the Earth's interior out into space, creating the magnetosphere. (4). The magnetosphere deflects charged particles from the solar wind, protecting the Earth from harmful radiation.

A region of space where the magnetic forces of a magnet or a moving electric charge can be felt is called a magnetic field. Moving electric charges, such the spinning electrons in an atom or the electrons in a wire, create magnetic fields. They can also be created by the Earth's core or permanent magnets.

The strength and direction of magnetic fields define them. A magnetic field's direction can be determined by calculating the force it would apply to a compass's north pole. The amount of force that a magnetic field would apply to a charged particle travelling through the field provides an indication of its intensity.

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The total resistance is 9 ohms + 7 ohms = 16 ohms. Thus, the current is 1.0V/16 ohms = 0.0625 A.

Total resistance is the total opposition that a circuit or device encounters when an electric current is applied to it. It is the sum of all the individual resistances of each component in the circuit. Resistance is measured in ohms and is calculated by dividing voltage by current.

The current through the battery is the same as the current through the entire circuit.
To calculate the current, we can use Ohm's law which states that the current (I) is equal to the voltage (V) divided by the resistance (R).
In this case, the voltage is 1.0V and the resistance is the sum of the three individual resistances.
Since the 21 ohm resistors are in parallel, their total resistance is 7 ohms (1/R = 1/21 + 1/21).
Therefore, the total resistance is 9 ohms + 7 ohms = 16 ohms. Thus, the current is 1.0V/16 ohms = 0.0625 A.

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The spring stores 0.5 joules of elastic potential energy when stretched by 0.5 meters.

What is Potential Energy?

It is a form of energy that is stored in an object and has the potential to do work. The amount of potential energy depends on the position, shape, and orientation of the object. The most common types of potential energy are gravitational potential energy, elastic potential energy, and chemical potential energy.

The elastic potential energy stored by a spring is given by the formula:

Elastic potential energy = 1/2 * spring constant * (extension)^2

where the spring constant is measured in Newtons per meter (N/m), and the extension is measured in meters (m).

Given that the spring constant is 2 N/m and the extension is 0.5 m, we can plug these values into the formula:

Elastic potential energy = 1/2 * 2 N/m * (0.5 m)^2

= 0.5 J

Therefore, the spring stores 0.5 joules of elastic potential energy when stretched by 0.5 meters.

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Answer:

Answer is in the attached photo.

Explanation:

The solution is in the attached photo, do take note the formula for linear collision:

m₁v₁i + m₂v₂i = m₁v₁f + m₂v₂f

where 'i' is the initial state and 'f' is the final state.

The time is 5s.

In this problem, the observer is driving through town at

vi​ =16 m/s applies the brakes and begin decelerating with }a=−3.2 m/s²

We calculate the time for the vehicle to stop, and the speed after half the stopping time.

We use the velocity-time equation of the vehicle. When the vehicle stops, the velocity is

vf  ⟹ =vi +at

T = Vf−vi

= 0−16 m/s / −3.2 m/s²

= 5.0 s

What is time?

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Answer:

In a Newton's ring arrangement, the difference in the square of the diameters of successive rings is equal to four times the wavelength of light divided by the refractive index of the medium between the planoconvex lens and the plane glass plate.

If the wavelength of light is changed to 4.5 x 10-5 cm, then the difference in the square of the diameters of successive rings will be equal to four times 4.5 x 10-5 cm divided by the refractive index of the medium (which is assumed to be 1 if a liquid of refractive index 1.33 is not introduced).

If a liquid of refractive index 1.33 is introduced between the lens and the plate, then the difference in the square of the diameters of successive rings will be equal to four times 4.5 x 10-5 cm divided by 1.33.

If the radius of curvature of the convex surface of the plano-convex lens is doubled, then the difference in the square of the diameters of successive rings will remain the same.

The acceleration is 2.7 m/s^2.

Acceleration is a measure of the rate at which an object changes its velocity. It is defined as the change in velocity per unit time and has units of meters per second squared (m/s^2). Acceleration can be positive (when an object is speeding up), negative (when it is slowing down), or zero (when its velocity is constant).

We can get the acceleration;

v^2 = u^2 - 2as

v = final velocity

u = initial velocity

a = acceleration

s = distance

Thus we have that;

v = 0 m/s thus;

u^2 = 2as

a = u^2/2s

a = (71.4)^2/2 * 939

a = 5097.96/1878

a = 2.7 m/s^2

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The horizontal speed at which the water leaves the hole is[tex]4.09 ms^-1.[/tex]

Speed is the rate of change of the position of an object in a given direction. It is expressed as the distance traveled per unit of time, typically measured in meters per second (m/s). It is also commonly represented by the symbol ‘v’. Speed is a scalar quantity, meaning it has only magnitude, not direction.

The kinetic energy per unit volume at the point of the hole is equal to the density of the water multiplied by one-half the square of the velocity of the water leaving the hole.

Since these two values are constant across a horizontal streamline, we can set up the following equation:

[tex]ρgh = ρ(v^2/2)[/tex]

Solving for v, we get:

[tex]v = √(2gh)[/tex]

Plugging in the values for the height of the water above the hole (h = 0.4 m) and the acceleration due to gravity[tex](g = 9.81 ms^-2)[/tex], we get:

[tex]v = √(2*9.81*0.4) = 4.09 ms^-1[/tex]

Therefore, the horizontal speed at which the water leaves the hole is [tex]4.09 ms^-1.[/tex]

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The electrons in copper (Cu) are loosely bound to the nucleus is the most accurate answer

explain about the copper ?

Copper is a chemical element with the symbol Cu and atomic number 29. It is a soft, malleable, and ductile metal with high thermal and electrical conductivity. Copper has been used by humans for thousands of years for various purposes including coinage, electrical wiring, plumbing, and industrial machinery. It is commonly found in nature as copper oxide or copper sulfide, and it can be extracted through mining and refining processes. Copper is also an essential nutrient for all living organisms and plays important roles in biological processes such as the formation of red blood cells and the maintenance of the nervous and immune systems.

The electrons in copper (Cu) are loosely bound to the nucleus is the most accurate answer. This is because in metals like copper, the outermost electrons of atoms are not tightly bound to their respective nuclei, and can therefore move easily through the material, allowing for efficient conduction of electricity. On the other hand, in non-metal substances like carbon fiber, the electrons are more tightly bound to their respective nuclei, making it less efficient in conducting electricity.

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Answer:

(Question) Why is copper wire a better conductor of electricity than carbon fiber?

(Answer) The electrons in copper (Cu) are loosely bound to the nucleus

(Question) Which of the following best describes a direct current?

(Answer) An electrical current that flows in one direction

(Question) Which of the following substances would allow an electric current to flow through it easily?

(Answer) aluminum (Al)

(Question) Which of the following statements about electrical charges is true?

(Answer) Opposite charges attract one another

(Question) Which of the following statements best describes the relationship between atoms and conductivity?

(Answer) Atoms with a nearly empty valence shell make good conductors

Explanation:

i just finished the quick check

Answer: Smaller planets are easier to detect using the transit method.

Explanation:

The transit method is a technique for detecting exoplanets, or planets outside our solar system, by observing the periodic dimming of a star as a planet passes in front of it (transits). The size of the planet affects the amount of light that is blocked, and therefore the magnitude of the dimming.

Smaller planets block less light than larger planets, making it more difficult to detect the transit. However, smaller planets are more numerous, and their transits are more frequent and easier to observe. Additionally, smaller planets are more likely to be located in the habitable zone of their star, where conditions may be suitable for life.

Therefore, smaller planets are easier to detect using the transit method, as they cause a smaller but more frequent dimming of the star, making them easier to detect with current technology. The relative size of the planet does matter in the transit method, as smaller planets are easier to detect.

Answer:

larger planets (correct)

Explanation:

Answer: True

Explanation:

The magnitude of the velocity of the horse will be 8.89 m/s.

Given, the mass of the horse is 900 kg and the momentum of the horse is 8000 Kgm/s.

To calculate, the velocity of the horse from the given values.

Momentum of any body is defined as the product of the mass of the body and the velocity of that body.                                         Momentum(p) = Mass(m) × Velocity(v)

Keeping the provided values in the formula, momentum = mass × velocity to calculate the velocity of the horse

8000 Kgm/s =  900Kg × velocity

velocity = 8000/900 m/s = 8.89 m/s

So, the velocity of the horse is 8.89 m/s.

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The magnitude of vector F⃗ is approximately 34.7.

Describe Magnitude?

Magnitude is a term used in physics to describe the size or quantity of a physical property or phenomenon, such as the strength of a force, the intensity of light or sound, or the size of a vector.

It is a scalar value that expresses the amount or level of a quantity, without specifying its direction or orientation. In the context of vectors, magnitude refers to the length of the vector, which is calculated using the Pythagorean theorem, by taking the square root of the sum of the squares of the vector's components. Magnitude is typically expressed in units that correspond to the physical property being measured, such as meters for length or newtons for force.

To find the magnitude of vector F⃗, we first need to calculate the components of vector F⃗.

F⃗ = A⃗ - 5B⃗

= 6i^ - 3j^ - 5(-4i^ + 4j^) [substituting the given values]

= 6i^ - 3j^ + 20i^ - 20j^

= 26i^ - 23j^

The magnitude of vector F⃗ is given by:

|F⃗| = √(F_x^2 + F_y^2)

= √(26^2 + (-23)^2) [substituting the values of F_x and F_y]

= √(676 + 529)

= √1205

= 34.7 (approx.)

Therefore, the magnitude of vector F⃗ is approximately 34.7.

To find the direction of vector F⃗, we need to calculate the angle that the vector makes with the positive x-axis.

The direction of vector F⃗ can be expressed as:

θ = tan^(-1)(F_y/F_x)

Substituting the values of F_x and F_y:

θ = tan^(-1)(-23/26)

θ ≈ -42.7°

Since the angle is negative, we can express the direction as 360° - 42.7° = 317.3° counterclockwise from the positive x-axis.

Therefore, the direction of vector F⃗ is approximately 317.3° counterclockwise from the positive x-axis.

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After a workplace incident requiring first aid, is it beneficial to review the first aid response because:

1) The WHS Act and Regulations make it a legal duty.

2) That the initial responder/s were properly trained for the occurrence.

3) Verify the efficacy of the workplace's first aid strategy and risk management procedure.

A review of first aid occurrences may be required by the workplace health and safety (WHS) act and regulations to confirm that correct procedures and protocols were followed and to identify any areas for improvement.

Confirming that the first aider/s had the requisite training for the event is critical to ensuring that the appropriate steps were taken during the incident and that the first aider/s were equipped with the knowledge and abilities to respond correctly.

After an event, review the first aid response to confirm the success of the workplace's first aid strategy and risk management approach. This can aid in identifying areas for development and preparing the workplace for similar situations in the future. The study may involve assessing the availability and accessibility of first aid equipment and supplies, as well as first aid personnel response time.

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a. The thickness of 1 card (of a deck of 52) = 0.011346 in/card

b. The decks that need to be measured together = 62,500

To calculate the thickness of 1 card, we divide the measured thickness of the deck by the number of cards in the deck:

(a)

0.590 in / 52 cards = 0.011346 in/card

The uncertainty of the measurement is also divided by the number of cards:

±0.005 in / 52 cards

= ±0.000096 in/card

So the thickness of 1 card is 0.011346 in ± 0.000096 in.

b. To reduce the uncertainty to 0.00002 in, we can use the formula:

uncertainty / √n = desired uncertainty

Where,

n is the number of decks measured together.

Rearranging the formula and plugging in the values:

n = (uncertainty / desired uncertainty)²n

= (0.005 in / 0.00002 in)²

n = 62,500

So we need to measure 62,500 decks together to achieve the desired uncertainty of 0.00002 in.

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Answer:

the expanse or amount of space between two things, points, lines, anything in science or math.

DISTANCE...

Explanation: