A 4.0 ohm resistor is connected in parallel with a 12 ohm resistor and both of these are connected to a DC power supply with voltage V. If the total current in this circuit is 2.0 A, what is the current through the 4.0 ohm resistor?

Answer:

total mass (m) of that substance divided by the total volume (V) occupied by that substances

According to the Keynesian view, manipulating foreign sector spending is not a reliable way to move the U.S. economy toward a more acceptable equilibrium because it does not address the fundamental causes of economic instability.

Keynesian economics focuses on the role of domestic demand in driving economic growth and stability. The government can use fiscal and monetary policy to stimulate aggregate demand and promote full employment. However, changes in foreign sector spending can be unpredictable and beyond the control of domestic policymakers. For instance, an increase in foreign demand for U.S. exports could boost economic growth and employment in the short run, but it may not be sustainable if the foreign demand later decreases. Similarly, a decrease in foreign demand for U.S. exports could have negative short-term effects on the economy, but it may not necessarily lead to a long-term decline. In short, Keynesian economics emphasizes the importance of domestic demand management and stabilizing the economy through government intervention. While changes in foreign sector spending can have some impact on the economy, they are generally seen as unreliable and unpredictable, and therefore not a reliable tool for achieving economic stability in the long run.

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Answer:

gap junctions,tight junctions,and desmosomes

Answer:

Cyber Law is a generic term referring to all the legal and regulatory aspects of the internet. Everything concerned with or related to or emanating from any legal aspects or concerning any activities of the citizens in the cyberspace comes within the ambit of cyber laws.

Explanation:

Answer:

I would need to see the part a to be more specific but this may help:

resources like solar, water, wind are considered renewable because they will never run out, they can be replenished over and over again. There will always be a sun (and if there wasn't then we'd have bigger conserns than renewable energy) and the wind will always blow. It can never run out because you use too much unlike coal and fossil fuels.

Hope this helps!

The time interval between the man clapping and hearing his echo is approximately 1.75 seconds.

An echo is a repetition or reflection of a sound or signal. It can be caused by sound waves bouncing off a surface, signal interference, or the repetition of a message in communication.

The speed of sound in air at room temperature is approximately 343 meters per second. When a person claps, the sound waves propagate outward in all directions and reach the school building, where they bounce off and return to the person as an echo. The time it takes for the sound to travel the distance to the building and back to the person is the time interval between the clap and the echo.

To calculate the time interval, we can use the following formula:

time = distance / speed

where distance is the total distance traveled by the sound (twice the distance from the person to the school building), and speed is the speed of sound in air.

distance = 2 x 300m = 600m

speed = 343 m/s

time = 600m / 343 m/s = 1.75 seconds (rounded to two decimal places)

Therefore, the time interval between the man clapping and hearing his echo is approximately 1.75 seconds.

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The initial momentum of the 25 kg object is 25 kg * 12 m/s = 300 kgm/s. After the collision, the momentum of the 25 kg object is 25 kg * 8 m/s = 200 kgm/s. According to the conservation of momentum, the momentum lost by the 25 kg object is equal to the momentum gained by the box. Therefore, the resulting momentum of the box is 300 kgm/s - 200 kgm/s = 100 kg*m/s.

1.

The number of the carbon atom is five. All the carbon atom is single-bonded.

The formula name of the above is Pentane.

The number of the carbon atom is four. All the carbon atom is single-bonded except one triple bond at the first place.

The formula name of the above is 1-butyne.

Answer:

III) \(d_{1}+ d_{2}=d_{t}\)

Explanation:

I) coordinate (0,5) is the head for \(d_{1}\) I will put the tail coordinate as (0,0) but it could be any other number in the x just not in the 5  with the the y being any other value.

II) coordinate (5,5) is the head for \(d_{2}\) the tail needs to be in the head of \(d_{1}\) being (0,5)

III) coordinates for \(d_{t}\) is connecting the tail from \(d_{1}\) and the head of \(d_{2}\) making it (0,0)\((tail)\) and (0,5)\((head)\) and is written as \(d_{1}+ d_{2}=d_{t}\)

(i) using coordinate grid notation to represent d₁, d₁ = 5y

(ii) using coordinate grid notation  to represent d₂, d₂ = 5x + 5y

(ii) The sum of d₁ and d₂ is written as 5x + 10y

In order to show the horizontal direction of a vector, we will place x after the magnitude of the vector.

Also, to show the vertical direction of a vector, we will place a y after the magnitude of the vector.

(i) Using coordinate grid to represent d₁ = (0, 5)

\(d_1 = 0(x) + 5(y)\\\\d_1 = 5y\)

(ii) Using coordinate grid to represent d₂ = (5, 5)

\(d_2 = 5x + 5y\)

(iii) The total vector is written as;

\(d_1 + d_2 = 5y + (5x + 5y)\\\\d_1 + d_2 = 5y + 5x + 5y\\\\d_1 + d_2 = 5x + 10y\)

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At pH = 8, the ratio of H+ ions to OH- ions is 1:1, indicating a neutral solution. The concentration of H+ ions and OH- ions is approximately 1 x 10^(-8) mol/L. The calculated and approximated ratios should match.

To calculate the ratio of H+ ions to OH- ions at pH = 8, we need to use the relationship between pH and the concentration of H+ ions. The pH scale is a logarithmic scale that measures the acidity or alkalinity of a solution based on the concentration of H+ ions.

The formula to calculate the concentration of H+ ions (\(C_H\)+) from pH is:

\(C_H\)+ = \(10^(^-^p^H^)\)

Substituting pH = 8 into the formula:

\(C_H\)+ = \(10^(^-^8^))\)

Using the properties of logarithms, we can calculate the concentration of H+ ions:

\(C_H\)+ ≈ 1 x \(10^(^-^8^))\) mol/L

According to the concept of neutrality in water, the concentration of H+ ions is equal to the concentration of OH- ions. Therefore, the concentration of OH- ions (\(C_O_H\)-) is also approximately 1 x \(10^(^-^8^))\)mol/L.

To calculate the ratio of H+ ions to OH- ions, we divide the concentration of H+ ions by the concentration of OH- ions:

Ratio = \(C_H\)+ / \(C_O_H\)-

Ratio = (1 x \(10^(^-^8^))\) / (1 x \(10^(^-^8^))\))

Ratio = 1:1

The ratio of H+ ions to OH- ions at pH = 8 is 1:1, indicating a neutral solution. This means that the concentration of H+ ions is equal to the concentration of OH- ions, resulting in a balanced ratio.

When comparing the calculated ratio of 1:1 to the approximated ratio at pH = 8, they should be the same because the ratio of H+ ions to OH- ions is determined solely by the pH value, which is consistent and mathematically derived. Therefore, the approximated and calculated ratios should match.

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The specific heat of the metal, assuming no heat is exchanged with the surroundings is 2140 J/(kg•K).

The specific heat capacity of the metal is determined from the principle of conservation of energy.

energy lost by the metal = energy gained by aluminum + energy gained by water

Q = mcΔθ

where;

0.425c(100 - 40) = 0.1(900)(40 - 15) + 0.5(4186)(40 - 15)

25.5c = 2250 + 52,325

c = 54,575/25.5

c = 2140 J/(kg•K)

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Answer:

the resultant of the two vectors 5 km SW and 12 km NW is a vector pointing 67.4 degrees north of west with a length of 13 km.

Explanation:

To find the resultant of two vectors, we need to draw them on a graph and then use vector addition. In this case, "SW" means "southwest" and "NW" means "northwest". We can represent "SW" as a vector pointing 45 degrees south of west (since southwest is halfway between south and west) and "NW" as a vector pointing 45 degrees north of west (since northwest is halfway between north and west).

We can then draw these two vectors on a graph with a scale of 1 cm = 1 km. The vector representing "5 km SW" will be 5 cm long and pointing 45 degrees south of west, and the vector representing "12 km NW" will be 12 cm long and pointing 45 degrees north of west.

To add these two vectors, we start by putting the tail of the second vector (12 km NW) at the head of the first vector (5 km SW). This creates a triangle with sides of 5 cm, 12 cm, and an unknown side representing the resultant vector. We can use the Pythagorean theorem to find the length of the resultant vector:

resultant^2 = 5^2 + 12^2

resultant^2 = 25 + 144

resultant^2 = 169

resultant = sqrt(169)

resultant = 13

So the length of the resultant vector is 13 cm, which represents 13 km. To find the direction of the resultant vector, we can use trigonometry. The angle between the first vector (5 km SW) and the resultant vector is equal to the angle whose tangent is 12/5 (the ratio of the opposite and adjacent sides of the triangle). We can use a calculator to find that this angle is approximately 67.4 degrees north of west.

Therefore, the resultant of the two vectors 5 km SW and 12 km NW is a vector pointing 67.4 degrees north of west with a length of 13 km.

In order to determine the value of y, first find the value of x.

Take into account that the sum of the interior angles of a triangle is equal to 180 degrees.

Then, you have:

120° + 20° + x = 180°

Simplify left side of the equation and solve for y, as follow:

140° + x = 180°

x = 180° - 140°

x = 40°

Then, the value of x is 40°

Now, consider that angle x and angle y are supplementary, that is, they add up 180°. Then, you ahve:

x + y = 180°

Replace the value of x and solve for y, as follow:

40° + y = 180°

y = 180° - 40°

y = 140°

Hence, the value of y is 140°

When filled with extra air its mass increased to 0.428kg also the top of polythene container mass connected to the perplex box of volume 1000cm³ and the number of times of air inside was 7.2 times. The density of the air filled in the polythene container is approximately 1.25 kg/m³.

The density of air filled in the polythene container can be determined by considering the change in mass and volume of the container before and after filling it with air. Given that the mass of the empty container is 0.419 kg and the mass of the container when filled with extra air is 0.428 kg, and the volume of the perplex box is 1000 cm³.

Calculate the mass of the air inside the container by subtracting the mass of the empty container from the mass of the container when filled with air:

Mass of air = Mass of filled container - Mass of empty container

= 0.428 kg - 0.419 kg

= 0.009 kg

Calculate the volume of the air inside the container using the given number of times the air inside is 7.2:

Volume of air = Volume of perplex box * Number of times air inside

= 1000 cm³ * 7.2

= 7200 cm³

Convert the volume of air to cubic meters (m³) by dividing by 1000000:

Volume of air = 7200 cm³ / 1000000

= 0.0072 m³

Calculate the density of air using the formula:

Density = Mass / Volume

Density = 0.009 kg / 0.0072 m³

≈ 1.25 kg/m³

Therefore, the density of the air filled in the polythene container is approximately 1.25 kg/m³.

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Explanation

(m) is measured in kilograms (kg)

Q1) ~mass (m) is measured in kilograms (kg) 

Q2)~acceleration (a) is measured in metres per second squared (m/s²)

Q3)~force (F) is measured in newtons (N)

Hope this helped you- have a good day bro cya)

Poor health and safety practices when using non-ionizing and ionizing radiation technologies can have significant consequences. Here are some potential consequences and the prevention and safety measures employed to mitigate them.

Consequences of poor health and safety:

Non-Ionizing Radiation:

Ionizing Radiation:

Prevention and safety measures:

Non-Ionizing Radiation:

Ionizing Radiation:

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The specific heat capacity of the substance is  -4,184 J/kg°C.

To find the specific heat capacity of the unknown substance, we can use the principle of conservation of energy. The energy lost by the hot water is equal to the energy gained by the unknown substance.

First, let's calculate the energy lost by the hot water. The initial temperature of the water is 75°C, and at the instant t, it drops to 55°C. The temperature change is ΔT = 55°C - 75°C = -20°C.

Using the specific heat capacity of water (Cw = 4,184 J/kg°C) and the mass of water (m = 750 g = 0.75 kg), the energy lost by the water can be calculated as:

Energy_lost = Cw * m * ΔT

= 4,184 J/kg°C * 0.75 kg * -20°C

= -62,760 J

Now, let's calculate the energy gained by the unknown substance. The initial temperature of the substance is 15°C, and at the instant t, it increases to 25°C. The temperature change is ΔT = 25°C - 15°C = 10°C.

Let's denote the specific heat capacity of the unknown substance as Cs. Using the mass of the substance (m = 1,500 g = 1.5 kg), the energy gained by the substance can be calculated as:

Energy_gained = Cs * m * ΔT

= Cs * 1.5 kg * 10°C

Since the energy lost by the water is equal to the energy gained by the substance, we can set up the equation:

-62,760 J = Cs * 1.5 kg * 10°C

Now, we can solve for the specific heat capacity of the substance, Cs:

Cs = -62,760 J / (1.5 kg * 10°C)

≈ -4,184 J/kg°C

However, the negative sign in the result indicates an error in the calculation or the assumption. It's not physically possible for the specific heat capacity to be negative. Please check the calculations and assumptions made in the problem.

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The unit vector notation in the given direction is \(0.58 \hat x + 0.81 \hat y\).

A physical quantity that has both directions and magnitude is referred to as a vector quantity.

A lowercase letter with a "hat" circumflex, such as "û," is used to denote a vector with a magnitude equal to one. This type of vector is known as a unit vector.

In terms of subtracting a vector, it works the same as adding the vector's opposite.

Given that:

\(\vec A = 22 \hat x + (-14)\hat y,\\\vec B = 2.5\hat x + 13\hat y.\)

( two given vectors are written here.)

Therefore: the subtraction of these two vectors will be:

\(\vec A - \vec B = (= 22 \hat x + (-14)\hat y) - (2.5\hat x + 13\hat y)\\= 19.5\hat x - 27 \hat y\)

Unit vector in that direction of vectors  is =

\(= \frac{19.5\hat x - 27 \hat y}{\sqrt{19.5^2 + (-27)^2} } \\= 0.58 \hat x + 0.81 \hat y\)

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Stationary waves are produced when two progressive waves with the same amplitude, frequenccy and speed but travelling in opposite directions undergo superposition. This means that they interfere with each other

Answer:

22 s

Explanation:

time = distance / velocity

We know that distance = 770 m and velocity = 35 m/s.

t = d / v

t = 770 m / 35 m/s

t = 22 s

It takes 22 seconds to cover 770 m. Hope this helps, thank you !!

Answer:

9.23m

Explanation:

Max height = u²sin²theta/2g

u is the speed = 34.7m/s

theta is the angle of elevation = 33°

g is the acceleration due to gravity = 9.8m/s²

Substitute into the formula

Max height = 24.7²sin²33/2(9.8)

Max height = 610.09sin²33/2(9.8)

Max height = 610.09(0.29663)/19.6

Max height = 180.97/19.6

Max Height = 9.23m

Hence the max height the football reaches during flight is 9.23m

Answer:

The distance of the object from the concave mirror determines if it is a virtual or real image

Explanation:

Concave mirrors form both real and virtual images. When the concave mirror is placed very close to the object, a virtual and magnified image is obtained and if we increase the distance between the object and the mirror, the size of the image reduces and real images are formed.

Answer:

Polar covalent bond or just covalent bond

Explanation:

I just hope this pic will help you

Answer:

You would weigh the same.

Explanation:

At the moment, since Earth is not a perfect sphere, the Earth "bulges out" at the equator, so you're further from the centre of the Earth. Since gravity acts through a body's center of mass, the further you are from the centre the weaker the gravitational acceleration you will feel, because gravity weakens over distance.

So, you're actually lighter at the equator than you'd be at the poles.

However, if the Earth was a perfect sphere, this "bulge" at the equator would not happen, and so you would weigh the same at the poles and at the equator.

Hope this makes sense.

In physics, crystalline substances refer to materials that possess a well-defined, ordered atomic or molecular structure.

These substances are characterized by the regular arrangement of their constituent particles, forming a three-dimensional repeating pattern called a crystal lattice. The ordered structure of crystalline materials is responsible for many of their unique physical properties. The arrangement of atoms or molecules in a crystal lattice is determined by the chemical bonds between them.

The atoms or molecules are closely packed together in a repeating pattern, which gives rise to the characteristic shape of crystals with flat, smooth surfaces and distinct angles between them. Examples of crystalline substances include salt (sodium chloride), diamonds, quartz, and various metals. Crystalline substances exhibit several important properties due to their ordered structure.

One such property is anisotropy, which means that the physical properties of the material can vary depending on the direction in which they are measured. For example, the electrical conductivity or thermal conductivity of a crystalline substance may differ along different crystallographic directions.

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The elongation of the rod beyond its original length would be 2.5 mm.

To elongation of the rod can be deduced using the formula:

ΔL = FL / AE

where:

The cross-sectional area of the steel rod is given by:

The force applied to the rod:

Thus:

ΔL = (98.1 x 2) / ((7.85 x \(10^{-7\)) x (200 x \(10^9\) ))

ΔL = 0.0025 m = 2.5 mm

In other words, the elongation of the steel rod beyond its original length is 2.5 mm.

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Answer:

hi \( \) \( \)

According to the information we can infer that the forces are PULLING forces, OPPOSITE FORCES, EQUAL, forces DO balance each other, the resultant force is ZERO, and there IS NO motion.

According to the information of the image, we can conclude that the forces shown above are PULLING forces because they involve pulling a rope on each side. Also, the forces shown above are OPPOSITE FORCES because they act in opposite directions, pulling the rope towards different sides.

On the other hand, the forces are EQUAL in magnitude because each side exerts a force of 1000 Newtons. Additionally, the forces DO balance each other because they have the same magnitude and act in opposite directions. The individuals on each side are exerting equal forces, resulting in a balanced system.

Finally, the resultant force is ZERO because the forces are equal in magnitude and act in opposite directions. The combined effect of the forces is no net force or resultant force and there IS NO motion because the forces are balanced, resulting in a net force of zero. In a balanced system, the objects will remain at rest or in a state of uniform motion.

Note: This question is incomplete. Here is the complete information:
Attached image

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