What causes air to move or circulate from one place to another?.

Answer:

 v₂ = 2.5 v₁

car leaves at 2.5 times the speed of the minivan

Explanation:

This is an exercise of conservation of the momentum, to solve it we create a system formed by the minivan and the car, therefore during the crash the forces are internal and the momentum is conserved.

Initial instant. Before the crash

        p₀ = M v₁+ 0

Final moment. After the crash

        \(p_{f}\) = M 0 + m v₂

how momentum is conserved

         p₀ = p_{f}

         M v₁ = m v₂

         v₂ = \(\frac{M}{m}\) v₁

let's calculate

        v₂ = 2000/800 v₁

        v₂ = 2.5 v₁

therefore the car leaves at 2.5 times the speed of the minivan

a. Does the spool cross the finish line before, after, or at the same instant as the block? Explain: Since the strings are pulled with the same constant tension, the spool and the block will start moving at the same time and will cover the same distance. Therefore, they will cross the finish line at the same instant.

b. Consider the following dialogue between two students:

Student: "I think that there's the same amount of work done on block and spool as they both move the same distance."

Student 2: "I disagree. I think that the hand pulling the spool does more work than the hand pulling the block since the string unwinds as the spool is pulled."

In this scenario, student 2 is correct. The work done on the spool is greater than the work done on the block because the spool unwinds as it is pulled, which means that more energy is required to move the spool a given distance than to move the block a given distance. Therefore, the spool will cross the finish line after the block.

c. When each crosses the finish line, is the total kinetic energy of the spool greater than, less than, or equal to that of the block? Explain:

The total kinetic energy of an object is equal to its mass times its velocity squared. Therefore, the total kinetic energy of the spool is greater than the total kinetic energy of the block since the spool is moving faster than the block.

d. When each crosses the finish line, is the translational kinetic energy of the spool greater than, less than, or equal to that of the block? Explain:

The translational kinetic energy of an object is equal to its mass times its velocity. Therefore, the translational kinetic energy of the spool is greater than the translational kinetic energy of the block since the spool is moving faster than the block.  

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The magnetic field at 10.76 m below the high voltage power line is approximately 41,835,820 µT when the line carries 450 MW at a voltage of 300,000 V. Rounded to the nearest integer, the magnetic field is 41,836 µT.

To calculate the magnetic field at a distance below a high voltage power line, we use the formula \(B=\frac{u0IH}{2\pi r}\)

Current, I = 450 MW = 450 × 10^6 W

Height, H = 0 m (since the power line is at ground level)

Distance below the power line, r = 10.76 m

Using the formula for the magnetic field, we substitute the given values:

\( B = \frac{{(4\pi \times 10^{-7} \, \text{{T}} \cdot \text{{m/A}}) \cdot (450 \times 10^6 \, \text{{W}}) \cdot (0 \, \text{{m}})}}{{2\pi \cdot 10.76 \, \text{{m}}}} \)

Simplifying the expression:

\( B = \frac{{450 \times 10^6 \, \text{{W}}}}{{10.76 \, \text{{m}}}} \)

Calculating the value:

\( B \approx 41,835,820 \, \text{{T}} \)

Rounding the magnetic field to the nearest integer:

\( B \approx 41,836 \, \mu\text{{T}} \)

Therefore, the magnetic field at 10.76 m below the high voltage power line is approximately 41,836 µT (rounded to the nearest integer).

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Answer:

Distance travelled is 7 meters and the displacement is 3 meters

The melting point of a substance is the temperature at which the substance changes its phase from solid to liquid.

The freezing point is the temperature at which the substance changes its phase from liquid to solid.

The melting point of a substance is the same as the freezing point. That is when the temperature of the substance in the liquid form is increased continuously, the temperature at which the substance turns into a solid is equal to the temperature at which the substance will turn into liquid from solid if the temperature is decreased continuously, from a higher temperature.

Answer:

In mathematics, a random walk is a mathematical object, known as a stochastic or random process, that describes a path that consists of a succession of random steps on some mathematical space such as the integers.

Explanation:

Answer:

decrease and neutralize each other

Explanation:

Answer:

240 μC

Explanation:

When two capacitors are connected in parallel, the effective capacitance is the sum of the individual capacitances. In this case, the effective capacitance is:

C = C1 + C2 = 2 μF + 2 μF = 4 μF

The charge on a capacitor is related to the capacitance and the potential difference across it by the equation:

Q = C × V

where Q is the charge, C is the capacitance, and V is the potential difference.

Using this equation, the charge on each capacitor can be calculated as follows:

Q1 = C1 × V = 2 μF × 120 V = 240 μC

Q2 = C2 × V = 2 μF × 120 V = 240 μC

Therefore, the charge on each capacitor is 240 μC.

True, parallax is the apparent change in location of an object due to the motion of the observer.

Parallax is a technique used in astronomy to measure the distance of nearby celestial objects, such as stars or planets, from Earth. This phenomenon occurs because the position of an object appears to change when viewed from different vantage points. The apparent change in location is due to the motion of the observer and not the actual movement of the object being observed.

For example, when you hold your thumb up in front of your face and close one eye, then switch to the other eye, your thumb appears to shift in position against the background. This shift is a result of the change in the observer's perspective, and it illustrates the concept of parallax. In astronomy, the observer's motion usually refers to the Earth's movement around the Sun, which causes nearby stars to appear to shift against the more distant background stars.

By observing this apparent change in position and knowing the baseline (the distance between the two observation points), astronomers can use trigonometry to calculate the distance to the celestial object. Parallax is an essential tool in the field of astrometry, helping astronomers understand the universe's scale and structure.

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Answer:

b

Explanation:

Answer:

Explanation:

acceleration is the change i velocity with respect to time.

Acceleration = change in velocity/time take

Acceleration = final velocity - initial velocity/time taken

Given initial velocity = 15m/s

final velocity = 25m/s

time = 6sec

Substituting the given value into the formula above to get acceleration

acceleration = 25-15/6

acceleration = 10/6

acceleration = 1.67m/s²

Hence Mia acceleration is 1.67m/s²

The activity of the source in Becquerel is 333.3Bq

The number of nuclei that disintegrate or decay per unit time is known as Activity.

Given that a sample of radioactive material emits 400000 particles over a period of 20 minutes.

Activity A = dN/dt

A = 400000 / 1200

A = 333.3 particles / s

A = 333.3 Bq

Therefore,

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The Celsius temperature is -40 degrees Celsius, and the Fahrenheit temperature is also -40 degrees Fahrenheit at this absolute temperature.

To find the absolute temperature at which the Celsius and Fahrenheit scales give the same numerical value, we can set up an equation and solve for the unknown temperature. The relationship between Celsius (C) and Fahrenheit (F) temperatures is given by the equation:

F = (9/5)C + 32

Since we want the Celsius and Fahrenheit temperatures to be equal, we can set up the equation:

C = (9/5)C + 32

To solve for C, we can simplify the equation:

C - (9/5)C = 32

(5/5)C - (9/5)C = 32

(-4/5)C = 32

Now we can solve for C:

C = 32 × (-5/4)

C = -40

Therefore, the Celsius temperature is -40 degrees Celsius, and the Fahrenheit temperature is also -40 degrees Fahrenheit at this absolute temperature.

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The given problem involves calculating the current drawn by three electrical devices plugged into the same outlet, and determining whether the combination of devices will blow the circuit breaker. Specifically, we are asked to calculate the current drawn by each device and to determine whether the total current drawn exceeds the circuit breaker's capacity.

To calculate the current drawn by each device, we need to use the formula for electrical power, which relates power, voltage, and current. The formula for power can be expressed as P = V * I, where P is power, V is voltage, and I is current.Using the given parameters and the formula for power, we can calculate the current drawn by the toaster, electric frying pan, and lamp.

To determine whether the combination of devices will blow the circuit breaker, we need to add up the currents drawn by each device and compare the total to the circuit breaker's capacity. If the total current drawn exceeds the circuit breaker's capacity of 15 A, the circuit breaker will trip and the devices will lose power.The final answers will be numbers with appropriate units, representing the current drawn by each device and the total current drawn by the combination of devices.

Overall, the problem involves applying the principles of electricity and power to calculate the current drawn by each device and to determine whether the combination of devices will exceed the circuit breaker's capacity. It requires an understanding of the formula for power and how it relates to voltage and current in an electrical circuit.

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Answer:

The answer is W

Answer:

240N

Explanation:

The formula for force is F=mass×acceleration.

Therefore, Force= 120×2= 240N

I think its c

d a c b

I hope this is helpful

Answer:

Its A.  B, C, A, D

Explanation:

Answer:

it would dry your hair lol

The magnitude and direction of the vector C= A - B can be found by subtracting the components of vector B from vector A. This gives us:

C = (3i + 4j) - (2i + 5j) = (3-2)i + (4-5)j = i - j

The magnitude of vector C can be found using the Pythagorean theorem:

|C| = √(i^2 + (-j)^2) = √(1^2 + (-1)^2) = √(1 + 1) = √2

The direction of vector C can be found using the inverse tangent function:

θ = tan^-1((-j)/i) = tan^-1((-1)/1) = tan^-1(-1) = -45°

Therefore, the magnitude of vector C is √2 and the direction is -45°.

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Answer: Weight of the objects and Coefficient of friction

Explanation: The factors that affect the friction between two surfaces are the weight of the object and the coefficient of friction of the surface.

While the density of a material refers to the mass per volume of one piece, the bulk density refers to the mass per unit volume of a larger sample or bulk quantity of the material.

The bulk density of a material refers to the mass per unit volume of a large quantity or a bulk sample of the material. It takes into account the overall volume occupied by multiple pieces or particles of the material.

Unlike the density of a single piece of the material, which considers the mass and volume of an individual unit, the bulk density considers the collective mass and volume of a larger sample that contains multiple pieces or particles.

It provides an average measure of the material's density when it is present in a larger quantity or in bulk form.

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The formula for angular velocity as a function of time when it rises linearly can be used to address this issue:

ωz(t) = ωz,0 + αz t

If t is time, z,0 is the angular acceleration at rest, and z is the starting angular velocity.

Applying the information provided, we have:

ωz,0 = -6.00 rad/s (initial angular velocity)

z (6.0 s) = +4.0 rad/s (final angular velocity)

t = 6.00 s (time elapsed) (time elapsed)

The angular acceleration z is what we're looking for.

Using the formula's supplied values as substitutes, we obtain:

-6.00 rad/s + z = +4.00 rad/s (6.00 s)

When we simplify and find z, we obtain:

Z = (5.00 rad/s - 6.0 rad/s)

/6.00 s = 1.67 rad/s^2

As a result, the wheel's angular acceleration is 1.67 rad/s2.

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The leaves are getting closer.

An electroscope is an early scientific instrument used to detect the presence of electrical charges in a body. The charge is detected from the motion of the test object due to the Coulombic electrostatic force acting on the test object. The amount of electric charge on an object is proportional to the voltage. The electroscope consists of a metal button and he two blades. When a negatively charged object is brought close to the instrument, the blade will repel and move away. There are two types of electroscopes: the medulla electroscope and the gold foil electroscope. When a negatively charged object is brought close to the electroscope, the charge induces a positive charge on the leaves. So nothing should happen. However, induction causes the leaves to move closer together.

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The big data characteristic that the Mayberry Mustangs' upgraded ability to collect data from their fans mainly involves is variety.

Variety is one of the three V's of big data, along with volume and velocity. Variety refers to the different types of data that are being collected and analyzed.

In the case of the Mayberry Mustangs, they are collecting a variety of data from their fans, including tweets, texts, personalized video clips, and other posts to the team website.

This variety of data allows the team to create a humorous mashup before each game that includes different types of content from their fans.

Therefore, the correct answer is variety.

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Answer:

1.2×10⁶ Hz

Explanation:

Applying,

v = λf............. Equation 1

Where v = speed of wave, λ = wavelength, f = frequency.

make f the subject of the equation

f = v/λ............... Equation 2

From the question,

Given: v = 3.0×10⁸ m/s, λ = 2.5×10² m

Substitute these values into equation 2

f =  3.0×10⁸/2.5×10²

f = 1.2×10⁶ Hz

Answer:

I'm not sure it is c I'm sure it is d

It accelerates at about 32 feet per second every second, so it starts falling at zero feet per second and, one second later it is traveling at 32 feet per second. That means that its average speed is 16 feet per second, so it will fall 16 feet in the first second.