A boat moving at a constant speed travels 15 meters in 8 seconds. How far does it travel
in 40 seconds?
O 75 meters
53 meters
335 meters
480 meters​

Answer:0

Explanation:

0

The angle of refraction θ₂ is 73.3°. Since θ₂ is less than 90 degrees, the ray will refract.

To determine whether the ray will reflect internally or refract into the air at the boundary between flint glass (n = 1.61) and glycerol (n = 1.47), we can use Snell's law. Snell's law relates the angles of incidence and refraction at an interface between two different media.

Snell's Law is given as;

n₁ × sin(θ₁) = n₂ × sin(θ₂)

where:

n₁ and n₂ are refractive indices of two media,

θ₁ is the angle of incidence, and

θ₂ is the angle of refraction.

In this case, the ray is traveling from flint glass (n₁ = 1.61) to glycerol (n₂ = 1.47). The incident angle is given as 68.9 degrees.

To determine whether the ray will reflect or refract, we need to compare the angle of refraction (θ₂) to 90 degrees. If θ₂ is greater than 90 degrees, the ray will reflect internally. If θ₂ is less than 90 degrees, the ray will refract.

Let's calculate the angle of refraction (θ₂) using Snell's law:

n₁ × sin(θ₁) = n₂ × sin(θ₂)

1.61 × sin(68.9°) = 1.47 × sin(θ₂)

0.996 = 1.47 × sin(θ₂)

sin(θ₂) = 0.996 / 1.47

θ₂ ≈ 73.3°

Since θ₂ is less than 90 degrees, the ray will refract.

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All of these representing velocity as a a vector.

wht is vector?

A vector in physics is a quantity that has both magnitude (size) and direction. Examples of common vectors in physics include force, velocity, and acceleration. Vectors are often represented graphically by arrows with the magnitude indicated by the length of the arrow and the direction indicated by the direction of the arrow.

Vectors can be added together to give the resultant vector, which has a magnitude and direction determined by the sum of the vectors being added. Vectors can also be multiplied by scalars to give a new vector with a greater or lesser magnitude but the same direction.

Therefore, All of these representing velocity as a a vector.

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Answer:

0.4329 seconds

Explanation:

We are given;

Distance; d = 0.635 m

Velocity; v = 3.22 m/s

Angle; θ = 62.9°

To find the time, we have to find the horizontal component of the velocity.

Thus, Vx = 3.22 × cos 62.9

Formula for time is;

t = d/Vx

t = 0.635/(3.22 × cos 62.9)

t = 0.4329 sec

Thus the time he will take to clear the hurdle is 0.4329 sec

A general expression for the magnitude of the angular velocity of the disk after the acceleration in terms of the frequency is ω = 2πf.

photo of For the magnitude of the disk's angular velocity following acceleration, formulate a generic statement in terms of frequency.The formula for angular acceleration is angular velocity () divided by acceleration time (t). Alternatively, pi () divided by the acceleration time (t) and 30 times driving speed (n). Radians per second squared (Rad/sec²), the standard SI unit of rotational acceleration, is produced by this equation.

When your fingers are curled in the direction of the disc's rotation, the thumb will point in the direction of angular velocity. The plane of rotation is perpendicular to the direction of angular velocity at all times.

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The data table supports that: Option B, "the force of gravity depends on the masses of the objects interacting." is the correct answer.

What is gravity?

Gravity, also sometimes called as gravitation, is the non-changing force of attraction that binds everything together in mechanics. Being the weakest known force in nature, it has little effect on determining the intrinsic properties of common objects.

In the given data table, the distance is same in all five cases, but we can see that the force of gravity is increasing with increase in mass of any one of the object or both of them. We can also understand it as the force of gravity is increasing with the increase in combined mass of both objects.

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27.44 J of the potential energy of the book relative to the ground, when a 1.60 m tall person lifts 1.40 kg of the book off the ground.

A 1.60 m m tall person lifts a 1.40 kg book off the ground so it is 2.00 m m above the ground.

The potential energy of the book relative to the ground would be:

PE = mgh

Where PE is the potential energy,

m is the mass,

g is the acceleration due to gravity, and

h is the height

The acceleration due to gravity is constant and is 9.8 m/s²

mass m = 1.40 kg

Height h = 2.00 m

mgh = 1.40 × 9.8 × 2.00 = 27.44 J

Ans: The potential energy of the book relative to the ground is 27.44 J.

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Answer:

answer is 2 ms-2

Explanation:

v= 10.0 m/s

u=4.0 m/s

t=3.0 seconds

a=?

from equation, v= u+at

10.0 m/s =4.0 m/s + a × 3s

6 m/s. = 3a

6/3 = a

2.0 m/s-2 = a

The wave function for a quantum particle is given by ψ(x)=A exp( −∣x∣ / a) where A and a=0.9 are constants and −[infinity] .

Answer:The given wave function for a quantum particle is ψ(x) = A exp ( −|x| / a). Here, A and a = 0.9 are constants. Given that the length of the box is L = 10 Å, the wave function must vanish outside the box, i.e., at x = ±L / 2.

Thus, ψ (±L / 2) = 0.   ψ (±L / 2) = A exp ( ±L / 2a) = 0.

Thus, ±L / 2a = ∞ ⇒ L = 2a∞/ = 2a/0.   the box's length is L = 2a/0.

The given wave function is ψ(x) = A exp ( −|x| / a)

The wave function vanishes at x = ±L/2

ψ(±L/2) = 0 ⇒ A exp (±L/2a) = 0 This means that ±L/2a = ∞ ⇒ L = 2a/0 , the length of the box is L = 2a/0.

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The total energy of the body at evevry point is remained same due to the law of conservation of energy. Distance from A to B and final velocity of the ball just reach before C is 44.3 m/s.

d (distance) from A to B is = √2gh

In this case given are, g = 9.8 m/s² and h = 100m,

so here d = √(2⋅9.8⋅100) = 44.3m.

Final velocity ,v = √2gh

Here given are , v is the velocity, g is the acceleration due to gravity, and h is the height. In this case,

g = 9.8 m/s² ,h = 100m,

v = √(2⋅9.8⋅100)

= 44.3 m/s (final velocity)

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Answer:

Electron, proton and neutron

Explanation:

In each and every atom they are consist of electron, proton and neutron.

The statement Cars already on the freeway do not have the right-of-way to cars merging onto the freeway is False.

The right-of-way is the right of a pedestrian, vehicle, or ship has to move ahead or proceed with precedence over others in a particular situation or place.

The right-of-way of car already on the freeway precedes those of other cars merging onto the freeway.

In conclusion, the right-of-way is a legal right as to who has precedence in a particular situation or place.

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Answer:

false

Explanation:

Core samples provide us with the actual rocks from inside Earth. They are considered direct evidence of Earth's interior.

Rocks from the interior of the Earth are actually sampled via core samples. These are regarded as concrete proof of the interior of the Earth. Because they take a direct sample of the rocks that make up the layers that make up the Earth's surface and core, core samples provide clear proof of what is inside the planet.

Researchers can identify differences in weather patterns and climatic changes across time using geological core samples. Also, there may be proof of species, as well as the sedimentary make-up of lake and river beds, for instance. The dynamic character of the Earth's formation and how it changes through time are directly demonstrated by core samples. Where there are changes in the composition of the Earth can be determined thanks to seismic waves.

Seismograms can be used by geologists to determine the various components of the Earth's internal structure, such as which regions are solid, molten, or made of gases.

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Correct question is:

________ provide us with the actual rocks from inside Earth. They are considered ________ evidence of

Answer:

Yes

Explanation:

Energy can be transferred from one object to another or between energy stores within the same object. For example on a pool table when white ball hits another ball energy is transferred from the kinetic store of the white ball to the kinetic store of the other ball.

Answer:

Yes. Energy changes from one form to another.

Explanation:

It is possible. For example, a rock sitting on a cliff has lots of potential energy. As it falls down the cliff, the potential energy turns into kinetic energy.

Another example would be a spring. When a spring is stretched it has a lot of elastic potential energy. When you release it it becomes kinetic energy.

The vertical induced stress at points b and c, located 8m below the surface, is 181.25 kPa.

To calculate the vertical induced stress (dsz) at points b and c, we need to use the Boussinesq's equation. The equation states that the vertical induced stress (dsz) at a point below the surface of a mat foundation is equal to the pressure induced by the foundation at the surface (P0) multiplied by a correction factor (N) and a depth factor (Z).

N and Z are determined by the distance from the center of the foundation to the point of interest. For point b and c, which are 8m below the surface, the depth factor (Z) is equal to 0.5.

The correction factor (N) can be calculated using the following formula:

N = (1 + 0.4(D/B))((B+D)/D)^0.5

Where D is the depth of the foundation and B is the width of the foundation.

Assuming a foundation width of 10m and depth of 2m, we can calculate N to be approximately 1.45.

Therefore, the vertical induced stress (dsz) at points b and c is:

dsz = P0 x N x Z = 250 kPa x 1.45 x 0.5 = 181.25 kPa

So, the vertical induced stress at points b and c, located 8m below the surface, is 181.25 kPa.

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Answer:

F = 48 [N]

Explanation:

To solve this problem we must use Newton's third law, which tells us that the sum of forces on a body must be equal to zero, that is, the body is in static equilibrium or in equilibrium.

ΣF = 0

24 + 24 - F = 0

F = 24 + 24

F = 48 [N]

Note: Jeff's force should be equal to the sum of Sally and Misha's forces, but in the opposite direction.

Answer:

0.0231 m/s

Explanation:

Given the question :

A small toddler is playing in his yard. Over the course of 29.01 s, he walks 2.099 m S before turning N and walking 1.429 m. What is his average velocity?

Distance walked south = 2.099 metre

Time taken = 29.01s

Distance walked north = 1.429 metre

Average Velocity = Displacement / time

The Displacement is hence,

(2.099 m - 1.429m) = 0.67m

Average Velocity = 0.67m / 29.01s

Average Velocity = 0.02309 m/s

Average Velocity = 0.0231 m/s

Answer:  If one billiard ball hits another, the second will move with the same force as the first.

A child wants to jump to climb a tree (reaction), he must push the ground to propel himself (action).

A man deflates a balloon; the force with which the air comes out causes the balloon to move from one side to the other.

Explanation:

-Hitting A Wall

-Rowing a boat

-Walking

Explanation:

1.If you hit a Wall with your hands or legs, you get hurt. Why?

Because of Newton's Third Law. You hit the wall with a force and that exact same amount of force is returned by the wall.

2. While Rowing a boat, when you want to move forward on a boat, you paddle by pushing the water backwards, causing you to move forward.

3.While Walking, You push the floor or the surface you are walking on with your toes, And the surface pushes your legs up, helping you to lift your legs up.

The subsequent current in the series RLC circuit is given by the equation: i(t) = I * cos(5t - Φ), where I is the amplitude of the current and Φ is the phase angle.

To find the subsequent current, we need to calculate the amplitude (I) and the phase angle (Φ) of the current.

First, let's calculate the resonant frequency (ω) of the circuit:

ω = 1 / √(LC) = 1 / √(10 * 10^(-2)) = 1 / √1 = 1 rad/s.

The applied voltage can be written as E(t) = E * cos(ωt), where E is the amplitude of the voltage.

Comparing this with the given voltage E(t) = 200 * cos(5t), we can equate the angular frequencies: ω = 5.

Now, let's find the impedance (Z) of the circuit:

Z = √(R^2 + (Xl - Xc)^2),

where R is the resistance, Xl is the inductive reactance, and Xc is the capacitive reactance.

R = 20 Ω

Xl = ωL = 1 * 10 = 10 Ω

Xc = 1 / (ωC) = 1 / (5 * 10^(-2)) = 20 Ω

Plugging in these values, we get:

Z = √(20^2 + (10 - 20)^2) = √(400 + 100) = √500 ≈ 22.36 Ω.

The amplitude of the current (I) can be calculated using Ohm's Law:

I = E / Z = 200 / 22.36 ≈ 8.94 A.

The phase angle (Φ) can be found using the relationship between resistance, inductive reactance, and capacitive reactance:

tan(Φ) = (Xl - Xc) / R = (10 - 20) / 20 = -0.5.

Therefore, Φ ≈ -0.464 rad.

The subsequent current in the series RLC circuit is given by i(t) = 8.94 * cos(5t + 0.464) A.

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Answer:

a) Gradient = rise/run = mass/volume

since the graph is mass against volume we know mass is on the y-axis and volume is on the x-axis

in physics it’s best to use a larger part of the graph to find the gradient, so imma use the biggest values.

90/4.5 = 20

(additional note: sometimes you may get a different gradient. For example, when using 30 and 1.4 you get ≈21 this is an anomalous result since ita gradient differs; a mass against volume graph is supposed to be linear)

b) gradient represents density (p) since gradient is = mass/volume. And density also = mass/volume

For c and d just plot the points and you’ll be able to read from the graph to get the values.

I got this graph (the image)

but you’ll be able to interpret better when ‘you’ draw it (so try plotting it)

The new volume of the gas V2 is 92.18 mL. The new volume of the gas can be calculated using the ideal gas law equation, PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the universal gas constant, and T is temperature.

For this example, the temperature of the gas should remain constant. Thus, the equation changes to PV1/P2V2 = nR, where P1 is the initial pressure and V1 is the initial volume, and P2 is the new pressure and V2 is the new volume.

Step 1: Using the ideal gas law, calculate the new volume:

V1 = 345 mL

P1 = 3.2 atm

P2 = 9.2 atm

V2 = (P1V1)/P2

V2 = (3.2 atm x 345 mL) / 9.2 atm

V2 = 92.18 mL

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The largest compartment for carbon in Earth's system is the deep ocean, specifically the deep-sea sediments.

These sediments contain vast amounts of organic and inorganic carbon that has accumulated over millions of years.

The amount of carbon stored in these sediments is estimated to be on the order of 40,000 billion metric tons, which is several times more than the amount of carbon stored in the atmosphere, land plants, and soils combined.

The deep ocean plays an important role in the global carbon cycle, as it serves as a long-term storage reservoir for carbon and helps to regulate the concentration of carbon dioxide in the atmosphere over long timescales.

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Newton's second law allows to find the acceleration of the two-body system, where a mass is hanging is:

Newton's second law states that the net force on a body is equal to the product of the mass and the acceleration.

         ∑ F = m a

Where the bold letters indicate vectors, F is the force, m the mass and the acceleration of the body.

A free body diagram is that diagram of the system where the forces are shown without the details of the bodies. In the attachment we have a free-body diagram of the system.

Let's write Newton's second law for each axis.

x- axis

        T = m₁ a

y-axis

body in the horizontal part

        N-W₁ = 0

       N = W₁

Body hanging.  

         W₂ - T = m₂ a

Wwhere the positive direction is down, let's write our system of equations.

                T = m₁ a  

         W₂-T = m₂ a

Let's Resolve.

          m₂ g = (m₁ + m₂) a

          a = \(\frac{m_2}{m_1+m_2} \ g\)  

Let's calculate.

         a =\(\frac{63}{10+63} \ 9.8\)  

         a = 8.46 m / s²

In conclusion using Newton's second law we can find the acceleration of the two-body system, where a mass is hanging is:

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Explanation:

work done is equals to force into displacement in the direction of force

Ans: D

In the given scenario of a 36.0 kHz, 16.0 V source connected to an inductor producing a 5.10 A current, the inductance is calculated to be 7.30 x 10⁻⁴H.

To find the inductance, we can use the formula:

Inductance (L) = voltage (V) / (2π x frequency (f) x current (I))

Plugging in the given values, we get:

L = 16.0 V / (2π x 36.0 kHz x 5.10 A) = 7.30 x 10⁻⁴ H

Therefore, the inductance is 7.30 x 10⁻⁴ H.

To calculate the inductance when given a 36.0 kHz, 16.0 V source connected to an inductor that produces a 5.10 A current, we can use the formula L = V / (2πfI). By plugging in the given values, we find that the inductance is 7.30 x 10^-4 H. This calculation shows that inductance is directly proportional to voltage and inversely proportional to both frequency and current. Therefore, by varying these values, the inductance of a circuit can be controlled.

The inductance of a circuit can be calculated using the formula L = V / (2πfI). In the given scenario of a 36.0 kHz, 16.0 V source connected to an inductor producing a 5.10 A current, the inductance is calculated to be 7.30 x 10⁻⁴H.

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By Using Euler's method with two steps, we can find the approximate value of Y(2) is 2.125. , where Y is the solution of the initial value problem dy/dx = x - y, and Y(1) = 3.

Euler's method is defined as a numerical technique which is  used to approximate solutions into ordinary differential equations. The method includes dividing the interval of interest into smaller steps and thereafter approximating the solution at each step by using the derivative of the function.

In this case, we are given the initial value problem dy/dx = x - y, with the initial condition Y(1) = 3. To approximate Y(2) using Euler's method with two steps, we will divide the interval [1, 2] into two equal steps.

Step 1:

We start with the initial condition Y(1) = 3. Using the differential equation dy/dx = x - y, we can approximate the value of Y at the midpoint of the interval [1, 2].

Using the step size h = (2 - 1) / 2 = 0.5, we can calculate Y(1.5) as follows:

Y(1.5) ≈ Y(1) + h × (x - y) = 3 + 0.5 × (1.5 - 3) = 3 + 0.5 × (-1.5) = 2.25

Step 2:

Now, using the value of Y(1.5) as the new approximation, we calculate Y(2) using the same process:

Y(2) ≈ Y(1.5) + h × (x - y) = 2.25 + 0.5 × (2 - 2.25) = 2.25 + 0.5 × (-0.25) = 2.125

Thus,  by using Euler's method with two steps, the approximate value of Y(2) is 2.125.

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The complete question is

Use Euler's Method With Two Steps To Approximate Y(2), Where Y Is The Solution Of The Initial Value Problem: Dy : X − Y, Y(1) = 3

Answer:

Polonium(Po)

Explanation:

Answer:

B. polonium (Po)

Explanation:

i took the test

Answer:

the answer is letter b i think

Pls change it if you think my answer is not right ^^

Answer:

sunspots

Sunspots are areas in the sun that has a magnetic field is about 2 thousand times stronger than Earth's. Also is much higher than anywhere else on the Sun.

calorimeter with iron will have the higher temperature at thermal equilibrium.

The particular heat capacity (symbol c) of a material in thermodynamics is the heat capacity of a sample of the substance divided by the mass of the sample, also known as massic heat capacity. Informally, it is the quantity of heat that must be added to one unit of mass of the substance to generate one unit of temperature increase. Specific heat capacity is measured in joules per kelvin per kilogramme, or J⋅kg−1⋅K−1,  The heat required to increase the temperature of 1 kilogramme of water by 1 K, for example, is 4184 joules, hence the specific heat capacity of water is 4184 J⋅kg−1⋅K−1. calorimeter with high specific heat  have the higher temperature at thermal equilibrium.

In this problem, specific heat of lead is 120 J/kg.°C. and that of iron is  450 J/kg°C.

if the both elements are heated from room temperature 25°C to 100°C,

Total heat contained in lead is,

Q = cmΔT = 120×0.05kg×75°C = 450 J

Total heat contained in iron is,

Q = cmΔT = 450×0.05kg×75°C = 1687 J

Specific heat of the water is 4.2 J/g°C.

Temperature of the calorimeter due to lead

T₂ - T₁ = Q/cm = 450/4.2×100

T₂ - 25 = 1.07

T₂ = 1.07 +25 = 26.07°C

Temperature of the calorimeter due to iron

T₂ - T₁ = Q/cm = 1687 /4.2×100

T₂ - 25 = 4.01

T₂ = 4.01 + 25 = 29.01 °C

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Answer:

180 [J].

Explanation:

1) the required work [W] can be calculated as difference of the energy: W=E₂-E₁, where E₁=mgh₁ - the energy before lifting, E₂=mgh₂ - the energy after lifting;

2) W=mgh₂-mgh₁, where m - mass; g=10 [N/kg], h - height;

3) then the required work [W]:

W=mg*(h₂-h₁)=30*6=180 [J].