if you were able to hold two hairs very close to each other and exactly parallel, what diffraction pattern would you get?

The density of the unknown sample is 0.67 g/ml.

To calculate the density, we use the formula:

Density = Mass / Volume

Mass = 38.00 g

Volume = 56.39 ml

Substituting the values into the formula:

Density = 38.00 g / 56.39 ml

Dividing the mass by the volume, we find:

Density = 0.674 g/ml

Rounding to two decimal places, the density of the unknown sample is 0.67 g/ml.

Density is a measure of how much mass is contained within a given volume. In this case, we are given the mass of the unknown sample as 38.00 g and its volume as 56.39 ml. To find the density, we divide the mass by the volume. By performing the calculation, we obtain a density of 0.674 g/ml.

When rounding the value to two decimal places, the density of the unknown sample is 0.67 g/ml. This means that for every milliliter of the sample, there is 0.67 grams of mass. Density is an important property in chemistry and materials science as it can help identify substances and determine their behavior in various applications.

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Answer:

I think the answer is a because boiling water cleans it

Boiling the water away, leaving the substance behind in the beaker is the way to separate the mixture. The correct option is A.

A mixture is basically a substances comprised of two or many distinct chemical substances which are indeed not linked covalently.

A mixture is the usually physical combination of two or more substances that retain their identities as well as are mixed in the way to form solutions, suspensions, along with colloids.

When two or more distinct substances are physically combined, a mixture is formed that can be distinguished back into its original substances.

When two or more substances combine to form a new substance that cannot be separated back into its original substances, a chemical reaction occurs.

The mixture can be separated by boiling the water away and leaving the substance in the beaker.

Thus, the correct option is A.

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The work done from the greatest to the least is, Mika, Chet, Sara, and Bill.

Work Done:

When some force is applied to an object to displace it for some specific distance, then the product of applied force and distance moved is known as work done.

Given data:

Distance covered by Chet, Mika, Sara, and Bill are, 1.0 m, 2.0 m, 1.5 m, and 0.5 m.

The magnitude of an applied force by Chet, Mika, Sara, and Bill are 50 N, 40 N, 30 N, and 60 N.

The expression for the work done by each of Chet, Mika, Sara and Bill are,

W = F × d

here, F is the magnitude of applied force and d is the distance covered.

Then, For Chet  

W1 = 50 × 1.0

W1 = 50 J

For Mika,

W2 = 40 × 2.0

W2 = 80 J

For Sara,

W3 = 30 × 1.5

W3 = 45 J

For Bill,

W4 = 60 × 0.5

W4 = 30 J.

Clearly, the order of work done is Mika > Chet > Sara > Bill

Thus, we can conclude that the order of work done from the greatest to the least is, Mika, Chet, Sara, and Bill.

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Answer:

displacement=specific distance

*Velocity=∆displacement/time

*acceleration=∆velocity/time

The theory that explains how our eyes collect light instead of emitting invisible intelligence-gathering probes was proposed by Alhazen, also known as Ibn al-Haytham, an Arab scientist during the Islamic Golden Age.

The theory in question was put forward by Alhazen, an influential Arab scientist who lived during the 10th and 11th centuries. Alhazen, also known as Ibn al-Haytham, made significant contributions to the understanding of optics and vision.

One of Alhazen's major works, "Kitab al-Manazir" (The Book of Optics), presented his theories on vision and light. In this book, he argued against the prevailing belief that the eyes emitted invisible rays to perceive objects. Instead, Alhazen proposed that vision occurs when light reflects off objects and enters the eyes, where it is then collected by the visual system.

Alhazen's work challenged the previous theories of vision put forth by ancient Greek philosophers, such as Euclid and Ptolemy. His emphasis on empirical observations and experimental methods marked a significant shift in scientific thinking.

Alhazen's theory of vision, which highlighted the passive nature of the eyes in collecting light rather than emitting rays, laid the foundation for our modern understanding of how light interacts with the visual system and how we perceive the world around us.

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The initial momentum of the player is m * 7.9 kg m/s.

To solve this problem, we can use the principle of conservation of momentum. Since there are no external forces acting on the system (player and goalpost), the total momentum before the collision should be equal to the total momentum after the collision.

Let's assume the mass of the football player is m. Initially, the momentum of the player is given by:

P_initial = m * v_initial

where v_initial is the initial velocity of the player (7.9 m/s).

After the collision, the player comes to a full stop, so the final velocity is 0 m/s. The change in momentum is:

ΔP = P_final - P_initial

Since the player comes to a full stop, the final momentum is 0. Therefore:

ΔP = -P_initial

During the collision, the player compresses the padding and his body by 0.26 m. This change in position is equivalent to the change in momentum:

ΔP = F * Δt

where F is the average force exerted on the player and Δt is the time taken to come to a full stop.

Since the problem does not provide the time of collision, we cannot calculate the exact average force or the mass of the player. However, we can still calculate the initial momentum using the given information.

P_initial = m * v_initial

Therefore, the initial momentum of the player is m * 7.9 kg m/s.

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1. Current means flow of electrons and electrons are negative charged and so are attracted to the positive end of the battery and repelled by the negative end.

2. When battery is connected in a circuit that lets the electron flow through it, they flow from negative to positive.

3. When negative terminal of cell is connected to other negative terminal of the cell in a particular circuit then, current will not flow in circuit as electrons cannot flow from negative to negative terminal.

The volume of the given  solid is:

V = ∭(D) dx dy dz = (1/2) * 9/2 * 9/2 = 81/8

To find the volume of the solid, we can use the triple integral. Since the solid is bounded by the planes z = x, y = x, x + y = 9, and z = 0, we can write the integral as:

V = ∭(D) dV = ∭(D) dx dy dz

where D is the region bounded by the given planes.

To set up the triple integral, we need to determine the bounds for the variables x, y, and z. Since the solid is bounded by the planes z = x, x + y = 9, and y = x, we can express z in terms of x and y. We have:

z = x

Since x + y = 9, we can also express y in terms of x:

y = 9 - x

Substituting this expression for y into the equation for z, we get:

z = x = x

Therefore, the bounds for x are 0 ≤ x ≤ 9/2. The bounds for y are 0 ≤ y ≤ 9 - x, and the bounds for z are 0 ≤ z ≤ x.

Using these bounds, we can set up the triple integral as follows:

V = ∭(D) dx dy dz = ∫x=0 to x=9/2 ∫y=0 to y=9-x ∫z=0 to z=x 1 dz dy dx

Evaluating this integral, we find that the volume of the solid is:

V = ∭(D) dx dy dz = (1/2) * 9/2 * 9/2 = 81/8

Therefore, the volume of the solid is 81/8.

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The growth of a comet's coma as it enters the inner solar system is primarily caused by the heating of the comet's nucleus by the Sun.

This causes the ice on the surface of the nucleus to sublimate, or turn directly from a solid to a gas, creating a cloud of gas and dust around the nucleus. This cloud, or coma, can grow to a large size as more and more material is released from the nucleus. In some cases, the coma can become as large as some planets, making the comet visible from Earth even without the aid of a telescope.

This process can continue until the comet reaches its closest approach to the Sun, at which point the intense heat and solar wind can cause the coma to be blown away, leaving only the nucleus and any remaining dust and debris. In summary, the growth of a comet's coma is a natural and expected occurrence as it enters the inner solar system, and is primarily caused by the heating of the comet's nucleus by the Sun.

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Answer:

\(E=\dfrac{1}{2}mv^2\)

Explanation:

If m is the mass of the object and v is the velocity of the object. The kinetic energy is due to the motion of an object. It is given by the relation as follows :

\(E=\dfrac{1}{2}mv^2\)

The above formula is used to find the kinetic energy of an object.

Answer:

Even inside their ships, astronauts are exposed to a slow drizzle of cosmic rays coming right through the hull. The particles penetrate flesh, damaging tissue at the microscopic level. One possible side-effect is broken DNA, which can, over the course of time, cause cancer, cataracts and other maladies.

Answer:

The answer should be south

Explanation:

Because it has more force to the south then to the north, west and east are the same so (40N South)

The gravitational force between them and the orbital speed of Jupiter is 4.385×10^23 N and 13.081 km/s.

Mass of Jupiter, m = 2 × 10^27 kg

Mass of Sun, M = 2 × 10^30 kg

the radius of Jupiter's orbit, R = 7.8 × 10^11 m

=> distance b/w Sun and Jupiter = radius of the Jupiter's orbit = R

Gravitational force b/w them = GMm/(R^2)

= (6.67 × 10^-11)×(2 × 10^30)×( 2 × 10^27) / (7.8 × 10^11)^2

= 4.385×10^23 N

since, centripetal force = centrifugal force

=> F = GMm/(R^2) = (mv^2)/R

=> v = √(GM/R) = 13.081 km/s

Gravitational force is a fundamental force in physics that governs the interactions between massive objects. According to Newton's law of gravitation, every object in the universe exerts a gravitational force on every other object, with the strength of the force proportional to the product of their masses and inversely proportional to the square of the distance between them.

The gravitational force between two objects causes them to attract each other, with the direction of the force being along the line connecting the centers of the objects. The gravitational force is always attractive and never repulsive, and it is responsible for many phenomena in the universe, from the orbits of planets around the Sun to the motion of stars within galaxies.

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Complete Question:

The planet Jupiter of mass 2 x 1027Kg revolves around the sun of mass 2 x 10"kg in a circular orbit of radius 7.8 x 10''m. Calculate the gravitational force between them and the orbital speed of Jupiter.​

Answer:

what table?

Explanation:

Answer:

-5

Explanation:

Answer:

η = 58.8%

Explanation:

Work is defined as the force applied by the distance traveled by the body.

\(W =F*d\)

where:

W = work [J] (units of joules)

F = force = 294 [N]

d = distance = 5 [m]

\(W = 294*5\\W = 1470 [J]\\\)

Efficiency is defined as the energy required to perform an activity in relation to the energy actually added to perform some activity. This can be better understood by means of the following equation.

\(efficiency = W_{done}/W_{required}\\efficiency = 1470/2500\\efficiency = 0.588 = 58.8%\)

The speed of the golf ball just as it leaves the tee is 40 m/s.

The force applied over a period of time is equal to the change in momentum of the ball. Thus, the initial momentum of the ball is 0 and the final momentum is equal to the force multiplied by the time.

Final Momentum = Force x Time

Final Momentum = 1000 N x 0.0018 s

Final Momentum = 1.8 kg m/s

What is momentum?

Momentum is the product of an object's mass and its velocity. It is a measure of an object's tendency to remain in motion, and is represented by the equation p = mv, where p is the momentum, m is the mass and v is the velocity.

Since momentum is equal to mass times velocity, we can calculate the velocity of the ball as it leaves the tee by dividing the final momentum (1.8 kg m/s) by the mass of the ball (0.045 kg):

Velocity = Final Momentum / Mass

Velocity = 1.8 kg m/s / 0.045 kg

Velocity = 40 m/s

Therefore, The speed of the golf ball just as it leaves the tee is 40 m/s.

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Answer:

20100s

Explanation:

About half of Americans depend on groundwater for drinking water sources. Therefore option B is correct.

Groundwater is an important source of drinking water for many Americans. It is estimated that approximately half of the population in the United States depends on groundwater as their primary source of drinking water.

This includes households that rely on private wells as well as those served by public water systems that use groundwater sources.

Groundwater is obtained by drilling wells into underground aquifers, which are natural reservoirs of water stored beneath the Earth's surface. It is a valuable resource that provides a consistent and reliable supply of water for drinking, irrigation, industrial use, and other purposes.

While groundwater is a significant water source for many Americans, it is important to note that the availability and quality of groundwater can vary depending on location.

Some areas may have abundant and accessible groundwater resources, while others may face challenges such as limited availability or contamination issues.

Overall, groundwater plays a vital role in meeting the water needs of a significant portion of the American population, making option B, "About half," the most appropriate choice.

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Your question is incomplete, but most probably your full question was,

Which best describes how many

Americans depend on groundwater

for drinking water source?

A. Very few

B. About half

C. Almost everyone

Answer:

Explanation:

Sure, here are five examples of problem-solving using the GRESA method for speed:

Example 1:

Given: A car travels 240 km in 4 hours.

Required: What is the average speed of the car?

Equation: Speed = Distance / Time

Solution: Speed = 240 km / 4 hours = 60 km/hour

Answer: The average speed of the car is 60 km/hour.

Example 2:

Given: A train travels at a speed of 100 km/hour for 2 hours, and then at a speed of 80 km/hour for the next 3 hours.

Required: What is the total distance traveled by the train?

Equation: Distance = Speed x Time

Solution: Distance = (100 km/hour x 2 hours) + (80 km/hour x 3 hours) = 200 km + 240 km = 440 km

Answer: The total distance traveled by the train is 440 km.

Example 3:

Given: A cyclist travels at a speed of 30 km/hour for 2 hours, and then at a speed of 40 km/hour for the next 3 hours.

Required: What is the average speed of the cyclist for the entire journey?

Equation: Average speed = Total distance / Total time

Solution: Total distance = (30 km/hour x 2 hours) + (40 km/hour x 3 hours) = 60 km + 120 km = 180 km

Total time = 2 hours + 3 hours = 5 hours

Average speed = 180 km / 5 hours = 36 km/hour

Answer: The average speed of the cyclist for the entire journey is 36 km/hour.

Example 4:

Given: A boat travels upstream at a speed of 10 km/hour, and downstream at a speed of 20 km/hour. The speed of the current is 5 km/hour.

Required: What is the speed of the boat in still water?

Equation: Speed of boat in still water = (Speed downstream + Speed upstream) / 2

Solution: Speed downstream = 20 km/hour, Speed upstream = 10 km/hour

Speed of current = 5 km/hour

Speed of boat in still water = (20 km/hour + 10 km/hour) / 2 = 15 km/hour

Answer: The speed of the boat in still water is 15 km/hour.

Example 5:

Given: A car travels a distance of 90 km in 2 hours. If the speed of the car had been 10 km/hour more, it would have taken 1 hour less to cover the same distance.

Required: What is the original speed of the car?

Equation: Distance = Speed x Time

Solution: Let the original speed of the car be x km/hour

Distance traveled at original speed = 90 km

Time taken at original speed = 2 hours

Distance traveled at increased speed = 90 km

Time taken at increased speed = 2 - 1 = 1 hour

Using the equation Distance = Speed x Time, we get:

90 = x * 2

90 = (x + 10) * 1

Solving these equations simultaneously, we get:

x = 40 km/hour

Answer: The original speed of the car is 40 km/hour.

Answer: When you have more than one battery in a circuit, you add the values of the individual batteries to get the overall voltage of the circuit.

Explanation:

The total pressure experienced by the diver at the given depth is 201,880 Pa.

The given parameters:

The total pressure experienced by the diver at the given depth is calculated as follows;

\(P = \rho g h\)

where;

ρ is the density of the liquid (kg/m³)

g is acceleration due to gravity

1.03 g/cm³ = 1,030, kg/m³

P = (1030) x (9.8) x (20)

P = 201,880 N/m²

Thus, the total pressure experienced by the diver at the given depth is 201,880 Pa.

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Answer:

Instead, we see the Moon because of the Sun's light reflects back to our eyes. In fact, the Moon reflects so much of the Sun's light that it's the second brightest object in the sky after the Sun. ... These objects — other planets and stars — can usually only be seen at night when the Sun's light doesn't outshine them.

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The impedance of the given AC circuit containing resistor and inductor parallel to each other is 55.71 ohms.

The given parameters;

The inductive reactance is calculated as follows;

\(\omega _l = 2\pi fl\\\\\omega _l = 2\times 3.142 \times 2,000\times 10\times 10^{-3} = 125.68 \ ohms\)

The impedance is the total opposition to the flow of current in the AC circuit and it is calculated as follows;

\(Z _{total} = \frac{1}{\frac{1}{Z_l} + \frac{1}{Z_R} } \\\\Z _{total} = \frac{1}{\frac{1}{125.68} + \frac{1}{100} }\\\\Z _{total} = 55.71 \ ohms\)

Thus, the impedance of the given circuit is 55.71 ohms.

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Your correct answers are:

B. A field that is perpendicular to the flow of charges

C. A magnetic field

When electric charges move through a conductor, two fields are formed: a magnetic field and an electric field. The correct answer is C. a magnetic field and D. an electric field.

A magnetic field is formed around the conductor when electric charges flow through it. This is due to the interaction between the moving charges and the magnetic field lines. The magnetic field is perpendicular to the flow of charges and its strength depends on the magnitude of the current flowing through the conductor.

An electric field is also formed around the conductor. This electric field is established due to the presence of charges and their interaction with each other. The electric field lines are typically radial, originating from the charged particles or the source of the electric field. The electric field exists both inside and outside the conductor.

So, the correct answer is C. a magnetic field and D. an electric field.

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Answer:

1.806 x10^24

Explanation:

as 2 moles of Al are reacting with 6 moles of HCl that means For the reaction of 1 mole of Aluminium needs 3 moles of HCl

Formula for No of molecules is,

                 No of Molecules = Moles x Avogadro's No

                                              = 3  x (6.02 x10^23)

                                              = 1.806 x10^24

Answer:

B. 1.806 x10^24

Explanation:

:p

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

From the question

mass = 35 kg

acceleration = 20 m/s²

We have

force = 35 × 20

We have the final answer as

Hope this helps you

The loss of kinetic energy is -24 J and the nature of the collision is inelastic elastic collision.

The initial kinetic energy of the balls is calculated as follows;

K.Ei = ¹/₂mvi²

where;

K.Ei = ¹/₂(4)(4²) + ¹/₂(2)(2²)

K.Ei = 36 J

K.Ef = ¹/₂mvf²

where;

K.Ef =  (0.5)(4 + 2)(2)²

K.Ef = 12 J

ΔK.E = K.Ef - K.Ei

ΔK.E = 12 J - 36 J

ΔK.E = -24 J

Thus, the loss of kinetic energy is -24 J and the nature of the collision is inelastic elastic collision.

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Answer:

I- In all circumstances,

N- Never relenting to pressure.

E- Ever remaining constant and stable,

R- Resisting any form of association with other things,

T- This force will always be the same.

I- In whatever manner or pattern the force may come from.

A- Always true to the core, never changing, never relenting.

Explanation:

An acrostic poem is the formation of a poem/ poetry by using certain letters of the word to form a poem. This means that certain letters of any given word will be used as the basis for the construction and formation of a poem.

The acrostic poem for the word "INERTIA" is as follows-

I- In all circumstances,

N- Never relenting to pressure.

E- Ever remaining constant and stable,

R- Resisting any form of association with other things,

T- This force will always be the same.

I- In whatever manner or pattern the force may come from.

A- Always true to the core, never changing, never relenting.

I- In all circumstances,

N- Never relenting to pressure.

E- Ever remaining constant and stable,

R- Resisting any form of association with other things,

T- This force will always be the same.

I- In whatever manner or pattern the force may come from.

A- Always true to the core, never changing, never relenting.

The inertia of any object is defined as when any object is at rest then it will be always at rest until and unless the external force is not applied on it. Also, if it is in motion, it will always in the motion until and unless an external force is not applied on it to stop it.

An acrostic poem is the formation of a poem/ poetry by using certain letters of the word to form a poem. This means that certain letters of any given word will be used as the basis for the construction and formation of a poem.

The acrostic poem for the word “INERTIA” is as follows-

I- In all circumstances,

N- Never relenting to pressure.

E- Ever remaining constant and stable,

R- Resisting any form of association with other things,

T- This force will always be the same.

I- In whatever manner or pattern the force may come from.

A- Always true to the core, never changing, never relenting.

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Answer:

  39.2 m/s

Explanation:

Given:

  free-fall from rest for 4 seconds

Unknown:

  final velocity (v)

Solution:

  equation: v = at

The acceleration due to gravity is 9.8 m/s², so the velocity after 4 seconds will be ...

  v = (9.8 m/s²)(4 s) = 39.2 m/s

At the bottom of the cliff, the velocity of the ball will be 39.2 m/s.