Rachel hears that there is a southerly wind today. In which direction does this wind blow?

East
West
North
South

MARKING BRAINLST

Answer:

For smooth surface:The light rays bounce off the table and all move in the same direction.

Answer:

721 kg/m^3

Explanation:

Trust me bro

Answer:

In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration.

Explanation:

Answer:

it takes 64 J of heat energy to heat 2 kg of lead from 265 K to 315 K.

Explanation:

To find out how much heat is needed to heat 2 kg of lead from 265K to 315 K, we can use the formula for specific heat capacity, which is:

q = mcΔT

Where:

q = heat energy (in joules)

m = mass of the substance (in kilograms)

c = specific heat capacity of the substance (in joules per kilogram per degree Celsius)

ΔT = change in temperature (in degrees Celsius)

The specific heat capacity of lead is 0.128 J/g°C. we need to convert it to J/kg°C

So, the heat energy needed is:

q = (2 kg)(0.128 J/kg°C)(315 K - 265 K)

q = (2 kg)(0.128 J/kg°C)(50 K)

q = 64 J

Therefore, it takes 64 J of heat energy to heat 2 kg of lead from 265 K to 315 K.

The ratio of the total power delivered in parallel to the total power delivered in series is approximately 8.49W/1W ≈ 2.64:1.

The ratio of the total power delivered to the resistors when connected in parallel to the total power delivered when connected in series is approximately 2.64:1. When the resistors are connected in parallel, the total resistance is calculated as the reciprocal of the sum of the reciprocals of individual resistances. In this case, the total resistance would be approximately 1.176kΩ. Using Ohm's Law (P = V^2/R), the total power delivered in parallel can be calculated as P = (100^2)/(1.176k) ≈ 8.49W.

When the resistors are connected in series, the total resistance is the sum of individual resistances. In this case, the total resistance would be 10kΩ. Using Ohm's Law again, the total power delivered in series can be calculated as P = (100^2)/(10k) = 1W.

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The angle of attack is approximately 4 degrees.

A more detailed explanation of the answer.

To find the angle of attack for a NACA 4415 airfoil with a 2m chord in an airstream with a velocity of 50 m/s and a lift per unit span of 1,595 N, follow these steps:

1. Calculate the dynamic pressure (q):
q = 0.5 * ρ * V^2
where ρ is the air density at standard sea-level conditions (1.225 kg/m³) and V is the airstream velocity (50 m/s).

q = 0.5 * 1.225 * (50)^2 = 1,531.25 N/m²

2. Calculate the lift coefficient (Cl):
Lift per unit span (L') = Cl * q * chord (c)
1,595 N = Cl * 1,531.25 N/m² * 2m

Now, solve for Cl:
Cl = 1,595 / (1,531.25 * 2) = 0.5208

3. Refer to a NACA 4415 lift coefficient vs angle of attack graph or data table to determine the angle of attack corresponding to the calculated Cl value. Since the Cl value is 0.5208, the angle of attack is approximately 4 degrees.

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Answer:

the answer is A. A school crossing guard raises a stop sign that weigh 10 N

Only the school crossing guard who raises a stop sign that weighs 10 N does the work.

Work done in physics is defined as the dot product of force and displacement caused by it. Mathematically -

W = F.x

W = |F| |x| cos Ф

where Ф is the angle between force and displacement

Given are the various situations from which we have to select the situation in which work is done.

A specific amount of displacement is needed for the work to be done. Similarly, the displacement and the force vectors should not have 90 degree angle between them. If any of this is zero than -

W = F × 0 = F × x × cos(90) = 0

It is only in case A that the guard applies a force equal to the weight of the stop sign and displacement is in the same direction. While in other three cases, either displacement is zero (C) or the angle between displacement and force is 90 degrees (B & D).

Therefore, we can conclude that, only the school crossing guard who raises a stop sign that weighs 10 N does the work.

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Answer:

pH value is between 6.5 and 6.8

Explanation:

Explanation:

Milk fresh from the cow typically has a pH between 6.5 and 6.7. The pH of milk changes over

Arcturus with an apparent magnitude of 0.0  and a distance of 11.0 pc has an absolute magnitude of approximately -0.3.

Arcturus, a star in the constellation Boötes, has an apparent magnitude of 0.0 and is located 11.0 parsecs away from Earth. To determine its absolute magnitude, we can use the distance modulus formula, which relates apparent magnitude (m), absolute magnitude (M), and distance (d) in parsecs: m - M = 5 * log10(d) - 5.

In this case, m = 0.0 and d = 11.0 parsecs. Rearranging the formula to solve for M, we get M = m - 5 * log10(d) + 5. Plugging in the values, we have M = 0.0 - 5 * log10(11.0) + 5.

Calculating the result, we find that Arcturus' absolute magnitude is approximately -0.3. This value represents the intrinsic brightness of the star, or the brightness it would have if it were placed at a standard distance of 10 parsecs away from the observer. In summary, the most likely value for Arcturus' absolute magnitude is -0.3.

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Explanation:

the net displacement of an object is

X-coordinate is

16.

Y-coordinate is

21-26=-5.

The magnitude of displacement is

d=√(〖16〗^2+(-5)^2 )=17 blocks.

The direction is

θ=tan^(-1)⁡〖5/16〗=17° east of south.

therefore, I think it helps you.

As energy is conserve:

\(Epi+Ekl=Epf+Ekf\)

i - initial

f - final

Beginning object at rest, \(Eki=0\). Object on the lowest position, hence \(Epf=0\).

Therefore:

\(Epi=Epf\)

\(M.g.h.=\frac{1}{2} (v^{2} )\)

Assume no Mass changed:

\(g.h.=\frac{1}{2}( v^{2} )\)

V is at bottom and assuming that \(g=\frac{10m}{s^2}\):

\(v=\sqrt{2gh}\)

\(v=\sqrt{2(10)(80)}\)

\(v=\sqrt{1,600}\)

\(v=40\)

The velocity is \(40m/s\)

Answer:

500j i got it right on a test

Explanation:

A substance's atomic structure, mass, and intermolecular forces are physical and chemical factors that affect its specific heat.

Various elements have different specific heat capacities, including carbon and oxygen. The quantity of energy needed to raise a substance's temperature by a given amount is referred to as a substance's specific heat capacity or specific heat, or simply as specific heat. For instance, compared to many other substances, water has a large specific heat capacity, which is why it is frequently employed to control temperature in both industrial operations and natural settings. This indicates that it requires a considerable amount of energy to raise water's temperature by a specific amount. Contrarily, metals with low specific heat capacity, such as copper, require a lot less energy to raise their temperature by the same amount.

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The answer to the given question is given below:a) The first liquid phase would form at a temperature of 1355 degree Celsius or 2471 degree Fahrenheit.b) The composition of this liquid phase would be calculated by using the lever rule. The lever rule states that the amount of any phase can be calculated by the ratio of the length of the tie line that intersects that phase to the total length of the tie line. So, according to the lever rule: Wt% Ni in the liquid phase = (Length of tie line to liquid phase) / (Length of entire tie line)  = (1360 - 1300)/(1360 - 1315) = 57.4%  Wt% Cu in the liquid phase = 100 - 57.4 = 42.6%c) The complete melting of the alloy occurs at a temperature of 1395 degree Celsius or 2533 degree Fahrenheit.d) The composition of the last solid remaining prior to complete melting is given by using the lever rule. Therefore, Wt% Ni in the last solid remaining prior to complete melting = (Length of tie line to solid phase) / (Length of entire tie line) = (1315 - 1300) / (1360 - 1315) = 30.3% Wt% Cu in the last solid remaining prior to complete melting = 100 - 30.3 = 69.7%Thus, these are the answers to the given question.

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(a) The liquid phase forms at a temperature of 1346°C or 2455°F.

(b) The composition of the liquid phase is 63.1 wt % Ni - 36.9 wt % Cu.

(c) Complete melting of the alloy occurs at a temperature of 1390°C or 2534°F.

(d) The composition of the last solid remaining prior to complete melting is 81.6 wt % Ni - 18.4 wt % Cu.

A copper-nickel alloy of composition 70 wt % Ni - 30 wt % Cu is slowly heated from a temperature of 1300°C (2370°F). We have to find the temperature at which the first liquid phase forms, the composition of this liquid phase, the temperature at which complete melting of the alloy occurs and the composition of the last solid remaining prior to complete melting. We will use the phase diagram for copper-nickel system as shown below: Fig: Phase diagram for copper-nickel system

(a) The liquid phase forms at the temperature where the line AE intersects the liquidus at point C. Reading off the temperature from the phase diagram, the temperature at which the first liquid phase forms is 1346°C or 2455°F.

(b) The composition of the liquid phase can be determined from the intersection of the horizontal line through C with the phase boundary between liquid and alpha phase. The composition of the liquid phase is 63.1 wt % Ni - 36.9 wt % Cu.

(c) Complete melting of the alloy occurs at the temperature where the line AE intersects the melting curve at point E. Reading off the temperature from the phase diagram, the temperature at which complete melting of the alloy occurs is 1390°C or 2534°F.

(d) The composition of the last solid remaining prior to complete melting can be determined from the point D where the line AD intersects the phase boundary between alpha and liquid. The composition of the last solid remaining prior to complete melting is 81.6 wt % Ni - 18.4 wt % Cu.

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The mass of the asteroid for the day to become 20% longer than it presently is as a result of the collision is three times the mass of the Earth.

When an asteroid collides with Earth, the day may become longer or shorter. The asteroid can cause Earth's rotation to slow down, leading to longer days or it may increase Earth's rotation speed, leading to shorter days. To find the mass of the asteroid for the day to become 20% longer than it presently is as a result of the collision, we can use the law of conservation of angular momentum. Angular momentum is the product of mass, velocity, and radius of the rotating object.

According to the law of conservation of angular momentum, the angular momentum of an object is conserved if there is no net external torque acting on it before and after a collision or any other event.

Mathematically, angular momentum is given as:

L = mvr

Where L = angular momentum, m = mass, v = velocity, r = radius of rotation. As the asteroid is very small compared to the Earth, we can assume that the Earth's mass remains constant before and after the collision. Therefore, the angular momentum of the Earth before and after the collision must be the same. Hence, we have:

L initial = L final

m asteroid x v asteroid x r asteroid = (m earth ) x (v earth ) x (r earth )

The speed of rotation of the Earth and the radius of rotation remains constant. Thus, we can substitute

v earth x r earth = constant in the above equation.

m asteroid x v asteroid = (m earth ) x constant x 1.2 {20% increase in length of day = 1.2}

m asteroid/m earth = 1.2/0.4

m asteroid/m earth = 3

The mass of the asteroid for the day to become 20% longer than it presently is as a result of the collision is three times the mass of the Earth.

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Temperature is the degree of hotness or coldness of an object or substance. The SI unit of temperature is Kelvin."97%": The question suggests that a reaction must be run at a specific temperature to achieve 97% yield or completion. Yield refers to the amount of product obtained from a reaction.

To achieve 97% yield or completion, the reaction must be run at a specific temperature. Temperature plays an essential role in chemical reactions since it affects the rate of reaction, activation energy, and equilibrium. The temperature at which a reaction runs optimally, producing the most product, is known as the reaction's optimum temperature. As a result, the temperature must be controlled during a chemical reaction.To achieve 97%, the reaction must be run at a specific temperature.

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The minimum non-zero thickness of a film with an index of refraction of 2.00 should be approximately λ/4n in order to minimize reflection.

When light passes from a medium with a high index of refraction to a medium with a lower index of refraction, some of the light is reflected. By adding a thin film with an index of refraction between the two media, the amount of reflected light can be reduced. The thickness of the film can be chosen to ensure that the reflected light from the top surface and the reflected light from the bottom surface interfere destructively, resulting in a minimum of reflected light. The minimum non-zero thickness that achieves this is approximately λ/4n, where λ is the wavelength of the incident light and n is the index of refraction of the film.

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Here are 3 alkali metals with physical and chemical similarity.

What is alkali metals?

Alkali metals are come from the fact that when these metals or their oxides dissolved in water.a basic solution results.

Three alkali metals -

1- hydrogen(H)

2-lithium(Li)

3-potassium(K)

Physical and chemical similarity of hydrogen -

-it is colourless and tasteless in nature.

-it is a combustible gas but not a supporter of combustion.

Physical and chemical similarity of lithium -

-it have a melting point of 180.54

-it is the lightest of all metals,with a density approximately half that of water.

Physical and chemical similarity of pottasium -

- this metal is soft and white with a silver lustre.

-it imparts a lavender colour to a flame, and it's vapour is green.

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The statement is true that sunlight falling on a spaceship in a vacuum will cause the spaceship to become a bit positively charged.

The photoelectric effect is the mechanism by which light may remove electrons from metallic surfaces, making them positively charged. The photoelectric effect might cause the surface of a metallic spaceship circling in sunlight to become positively charged.

Measuring the electron's energy is necessary for the photoelectric effect. Vacuum is necessary if you want to perform this with electrons. Under atmospheric conditions, electrons collide violently with gas molecules and atoms and quickly lose energy, which is completely unacceptable. Vacuum is therefore necessary.

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True: Most stars are members of groups of two or more stars, called star systems.

A star system is a group of two or more stars that will orbit around a common center of gravity. The star system composed of two stars is called a binary star system and as long as there are no external disturbances produced by other forces, it will be a stable system.

If it is composed of more than two stars, it is already called a multiple star system.

Therefore we can confirm that the affirmation "most stars are membrers of groups of two or more stars, called star systems" is true.

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The final velocity of the electron starting from rest is 9.3 × 10⁶ m/s.

Given:

Initial velocity (v0) = 0 m/s

Electric field (E) = 8.0 × 10⁴ N/C

Distance (∆x) = 5.0 cm = 0.05 m

Mass of electron (me) = 9.11 × 10⁻³¹ kg

Charge of electron (e) = 1.6 × 10⁻¹⁹ C

Final velocity (v) = ?

Using the following equation to calculate the final velocity of the electron:

v² = v0² + 2a∆x

Where:

v = final velocity

v0 = initial velocity

a = acceleration

∆x = distance

The acceleration of the electron is given by the electric field, E, and the mass of the electron, me, as follows:

a = E/me

Plugging in the known values:

a = (8.0 × 10⁴ N/C) / (9.11 × 10⁻³¹ kg) = 8.75 × 10¹⁴ m/s²

Plugging in all the known values in the equation for v:

v² = (0 m/s)² + 2 × (8.75 × 10¹⁴ m/s²) × (0.05 m)

v² = 8.75 × 10¹³ m²/s²

v = 9.3 × 10⁶ m/s

Therefore, the final velocity of the electron is 9.3 × 10⁶ m/s.

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Answer:

ok lol

Explanation:

ok but I will still answer

Answer:daddy

Explanation:

Answer:

A. 9.3m/s

Explanation:

Study Island.

Answer:

Attenuation

Step By step Explanation:

The decrease in the intensity of light over distance, such as with increasing depth in water, is known as ______.

It is called attenuation.

The decraese in the amplitude of the signals is called attenuation.

The electromagnetic byproducts of the explosion that gave birth to the cosmos are the cosmic background radiation.

The first light to ever be able to move freely throughout the universe is the Cosmic Microwave Background (CMB), which has since been cooled. The 'Big Bang' was followed by the release of this 'fossil' radiation, which is the farthest that any telescope can observe. It is seen by scientists as a "shockwave" or echo of the Big Bang.

The flimsy great bang light is preserved in the cosmic microwave background radiation. About 2.5 percent of the sky is covered by this false-color image, which depicts variations in the ionized gas that eventually condensed to form superclusters of galaxies.

A form of radiation called cosmic background radiation is one in which photons can move around freely since the universe has been transparent to radiation since the Big Bang.

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The speed with which a wave travels on this piano string is approximately 537.3 m/s.

To find the speed with which a wave travels on the piano string, we can use the equation:

v = √(T/μ)

where v is the speed of the wave, T is the tension in the string, and μ is the mass per unit length of the string.

Plugging in the values given, we get:

v = √(1300 N / 4.50 10-3 kg/m)

Simplifying this expression, we get:

$v = \sqrt{2.89 \times 10^5 \text{ m}^2/\text{s}^2}$

Evaluating this expression, we get:

v = 537.3 m/s

Therefore, the speed with which a wave travels on this piano string is approximately 537.3 m/s.

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