The diagram shows forces acting on a boat.
Which arrow represents the direction of upthrust?

look at the photo

A situation that involves the transfer of heat by means of convection must involve the exchange of fluid currents such as land and sea breezes.

Heat transfer by convection is a method of heat transfer by which heat is transferred between two bodies through through currents of moving fluids or gases.

The following are examples of heat transfer by convection;

Thus, a situation that involves the transfer of heat by means of convection must involve the exchange of fluid currents such as land and sea breezes.

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The new orbital speed after friction from the earth's upper atmosphere is 8674.15 m/s.

When the work done by a force does not depend on the choice of path, the force is called the conservative force. Some examples are a gravitational force, elastic spring force and electric force. On the other hand, when the work done by a force relies on the choice of the path of the motion, it is called non-conservative force.

The net work done by non-conservative force is W = ΔK + ΔP ----(1)

Given that, work done W = -7.5 * 10⁹ J

Change in kinetic energy = (Kf - Ki)

Final kinetic energy Kf = 1/2* m * Vf²

Initial kinetic energy Ki = 1/2* m * Vi²

Mass of the satellite m = 848 kg

Vf = Final speed

Vi = Initial speed = 9640 m/s

Change in gravitational potential energy ΔP = 0

Substituting the values in (1),

1/2* m (Vf² - Vi²) = W

1/2 * 848( Vf² -9640²) = W

Making Vf as subject,

Vf = √( 2W/m + Vi²)

⇒ √( -2* 7.5 * 10⁹/848 + 9640²)

⇒ 8674.15 m/s

Thus, the final speed decreases due to friction.

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In summary, the amount of time a low mass star will stay on the main sequence is determined by its mass, radius, and temperature. Typically, a low mass star will remain on the main sequence for billions of years.

A low mass star is a star that is small in size, mass, and brightness. It is typically around 0.5-2 solar masses and is relatively cool compared to other types of stars. On the main sequence, which is the period when the star is fusing hydrogen into helium in its core, a low mass star can remain for a very long time. The length of time that a low mass star remains on the main sequence is determined by the rate at which it fuses hydrogen into helium in its core. This rate is determined by the star's mass, radius, and temperature. Generally, the lower the mass of the star, the longer it will remain on the main sequence. For example, a star with a mass of 0.5 solar masses will remain on the main sequence for around 20-30 billion years, while a star with a mass of 1 solar mass will remain on the main sequence for around 10 billion years.

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Answer:

In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant.

I don’t know how ellipse change tho sorry

Answer: A I just got it wrong because of the other person.

Explanation:

The electromagnetic waves are those waves that move through space and carry electromagnetic radiant energy.  They include radio waves and microwaves. and many more.  

Hence the option A is correct.

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Answer:

12000N

Explanation:

gravity on earth is six times one on the moon

The solution of highest Global Horizontal Irradiance is Arizona.

The state that has highest average daily values of Global Horizontal Irradiance (GHI) is Arizona.

It is important to note that GHI is a measure of the total amount of sunlight that reaches a horizontal surface, and this value is essential for solar energy applications.

GHI is affected by several factors, such as latitude, altitude, cloud cover, and atmospheric conditions. Arizona has a higher average daily value of GHI due to its location, which is closer to the equator.

This factor ensures that Arizona receives more direct sunlight throughout the year, even when compared to the other states mentioned in the question. Therefore, it is safe to say that Arizona is the state with the highest average daily values of Global Horizontal Irradiance (GHI) compared to the other states listed above the states.

Arizona is located closer to the equator, and hence, it receives more direct sunlight throughout the year. Compared to Wisconsin, Florida, and Georgia, Arizona has a higher average daily value of GHI, making it an ideal location for solar power applications. With this high value, solar panels in Arizona are more efficient and produce more electricity compared to the other states.

Therefore, it can be concluded that Arizona has the highest average daily values of Global Horizontal Irradiance (GHI) compared to other states mentioned.

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Answer: 25.04m/s

Explanation:

v^2 = v^2o + 2a(x-xo)

v^2 = velocity 

v^2o = initial velocity 

a = acceleration 

x = final position/distance 

xo = initial position/distance

In this case, the initial velocity is 0 since the ball wasn't moving before it was dropped. The final position is 32 as the motion ended after the ball traveled 32m. The initial position is 0. The acceleration is 9.8m/s (free fall). Plug these numbers into the formula: 

v^2 = 0 + 2(9.8)(32)

v^2 = 25.04396135 

Round to get 25.04m/s

Two fossils are found on the bank, one near the bottom of the bank, close to the creek, and one higher up near the top. It can probably be said that the fossil found near the bottom is older than the fossil found near the top, therefore the correct answer is option A.

Science is the methodical, empirically-based pursuit and application of knowledge and understanding of the natural and social worlds.

As given in the problem statement, there are several different layers in the soil along a bank of a creek. Two fossils are found on the bank, one near the bottom of the bank, close to the creek, and one higher up near the top.

Thus,  It can probably be said that the fossil found near the bottom is older than the fossil found near the top, therefore the correct answer is option A.

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A physicist is trying out a new machine in her lab. It can launch human skulls in a space without air. She can change the way it points. She tries it by shooting a skull at the ground. She shoots it up at a 70-degree angle and it goes 18 meters per second.

A. What is the speed of the skull when it goes up and when it goes sideways?

B. How fast is the skull going when it is as high as it can go?

C. How much time passes before the skull hits the ground?

D. How far away does the skull go?

To answer the questions related to this physics problem, you can use the following formulas:

The x-component of the initial velocity (vx) can be found using the formula: vx = v0*cos(theta), where v0 is the initial velocity magnitude (18.0 m/s) and theta is the launch angle (70 degrees).

The y-component of the initial velocity (vy) can be found using the formula: vy = v0*sin(theta).

The time it takes for the skull to hit the ground (t) can be found using the formula: t = (2*vy)/g, where g is the acceleration due to gravity (9.81 m/s^2).

The maximum height reached by the skull (h) can be found using the formula: h = (vy^2)/(2*g).

The range of the skull (R) can be found using the formula: R = (vx*vy)/g.

A. To find the x and y components of the skull's initial velocity, we use the following equations:

Vx = V cosθ

Vy = V sinθ

where V is the magnitude of the velocity, θ is the launch angle, Vx is the velocity in the x-direction, and Vy is the velocity in the y-direction.

Given V = 18.0 m/s and θ = 70 degrees, we have:

Vx = 18.0 m/s × cos(70 degrees) ≈ 5.53 m/s

Vy = 18.0 m/s × sin(70 degrees) ≈ 17.5 m/s

Therefore, the x and y components of the skull's initial velocity are 5.53 m/s and 17.5 m/s, respectively.

B. At the peak height, the skull's vertical velocity (Vy) will be zero. We can use the following equation to find the speed at the peak height:

Vy = V sinθ - gt

where g is the acceleration due to gravity (approximately 9.81 m/s^2).

Setting Vy to zero and solving for V, we have:

V = gt/sinθ ≈ 36.5 m/s

Therefore, the skull is traveling at a speed of approximately 36.5 m/s at its peak height.

C. To find the time it takes for the skull to hit the floor, we can use the following equation:

y = Vyt - 0.5gt^2

where y is the initial height of the skull (assumed to be zero), Vy is the initial velocity in the y-direction, g is the acceleration due to gravity, and t is the time.

Setting y to zero and solving for t using the quadratic formula, we get:

t = [Vy + sqrt(Vy^2 + 2gy)]/g

Substituting the values we have, we get:

t = [17.5 m/s + sqrt((17.5 m/s)^2 + 2 × 9.81 m/s^2 × 0)]/9.81 m/s^2 ≈ 1.79 s

Therefore, the skull will hit the floor after approximately 1.79 seconds.

D. To find the range of the skull, we can use the following equation:

x = Vx × t

Substituting the values we have, we get:

x = 5.53 m/s × 1.79 s ≈ 9.89 m

Therefore, the range of the skull is approximately 9.89 meters.

ChatGPT

A. To find the x and y components of the skull's initial velocity, we first need to break the initial velocity vector into its x and y components. The initial velocity vector can be represented as:

The x component of the initial velocity can be found using:

where θ is the angle above the horizontal. Substituting the values, we get:

The y component of the initial velocity can be found using:

Substituting the values, we get:

B. At the peak height, the vertical component of the velocity becomes zero. Therefore, we can use the equation:

where v₀ is the initial velocity, g is the acceleration due to gravity, and y is the vertical displacement. At the peak height, y is equal to:

Using this value of y and the initial velocity, we can find the speed of the skull at the peak height:

Substituting the values, we get:

C. To find the time it takes for the skull to hit the floor, we can use the equation:

where t is the time taken for the skull to hit the floor. At the point of impact, y is equal to zero. Substituting the values, we get:

Solving for t, we get:

D. To find the range of the skull, we can use the equation:

Substituting the values, we get:

The efficiency of this light bulb is 25% .

Given data :

output = 30j

Input = 120j

Efficiency  = output / input x 100

  = 30 / 120 x 100

  = 25%

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Answer:

Explanation:

Well mathematically it would look like this

E = k * I

k is the constant of proportionality.

As the voltage goes up, so does the current.

As the voltage goes down, so does the current.

In physics and engineering,, the formula is written somewhat differently.

E = I * R

The R is a device which limits the current. If R = 0 (like it is just a switch closing) then the first thing you will notice is that the lights go out and you better know where the circuit breakers are and have a flashlight to see which one you shorted out.

So R has a value > 0 in practice.

option (B) ←  is the direction of the average velocity of the particle during this time interval. The displacement is directly to the left. The average velocity is proportional to the displacement.

Velocity=displacement/time

Displacement=velocity X time

For constant time,

Displacement ∝velocity

If we increase the velocity of the object, then it covers the more distance for same time.

Directly to the left is where the displacement is. The displacement is inversely proportional to the average velocity.

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Complete Question is :

a particle continuously moves in a circular path at a constant speed in a counterclockwise direction, as shown. consider the time interval during which the particle moves along this circular path from point p to point q. point q is exactly halfway around the circle from point p. what is the direction of the average velocity of the particle during this time interval?

(A) →  

(B) ←  

(C) ↑  

(D) ↓  

(E) The average velocity is zero.

Answer: Block A - 19.3

Block B - 0.64

Block C - 0.70

Block D - 0.917

Block E - 3.53

Explanation: i hope this helps you a little

Answer:

object with larger mass

Explanation:

the momentum of an object is directly proportional to its mass. larger mass = more momentum

Answer:

The one with a larger mass should have the higher momentum.

Explanation:

The magnitude of the net force on the block while it is sliding is 9.8 N.

The angle of inclination of the plane is calculated by applying the principle of trigonometry ratio.

Considering the vertical height (10 m) and length of the incline (20 m);

sin θ = 10 m / 20 m

sin θ = 1/2

sin θ = 0.5

θ = arc sin(0.5)

θ  = 30⁰

The magnitude of the net force on the block while it is sliding is calculated as follows;

F(║) = F(net) = mg sinθ

where;

F(net) = (2 x 9.8) x sin(30)

F(net) = 9.8 N

Thus, the net force on the block is the parallel component of the weight of the block.

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Answer: Final speed,Vf= -4.5m/s

It is the same speed but in opposite direction,coming down against gravity.

Explanation:

Calculating distance,d= (Vf^2-Vo^2)/2g

d=(0-4.5^2)/(2×9.8)

d= -20.25/19.6

d= -0.053m

Vf^2=Vo^2 + 2gd

Vf= Sqrt(0 +2×9.8(×-0.053))

Vf=V=-4.5m/s

The speed of the airplane, v is 144.2 m/s

The height, H of the roof above the head of the man is 66.4 m.

The speed of the airplane is determined using the Pythagoras theorem.

The speed of the airplane, v is calculated as follows:

v = √(80² + 120²0

v = 144.2 m/s

The height, H of the roof above the head of the man is calculated as follows:

tan 38° = H/85

H = tan 38° * 85 m

H = 66.4 m

In conclusion, the tangent ratio is used to find the height of the roof above the head of the man.

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C) always true

Consider an RLC series circuit. The impedance of the circuit increases if Xc increases. Option (C) is always true.In an RLC series circuit, the impedance (Z) is given by;Z² = R² + (XL - XC)²Where R is the resistance, XL is the inductive reactance, and XC is the capacitive reactance.The capacitive reactance is inversely proportional to the capacitance, thus if Xc increases, the capacitive reactance decreases. Hence the denominator in the equation above decreases, thereby increasing the impedance. Therefore, it is true that the impedance of an RLC series circuit increases if Xc increases.

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Evaluate

a) L{e+(2t - 1)² + sin(-3t) + cos(5t)}

To evaluate this Laplace transform, we'll use the basic Laplace transform properties and formulas.

Step 1: Apply the Laplace transform to each term separately.

L{e} = 1/s [Using the Laplace transform of the exponential function]

L{(2t - 1)²} = (2/s)² [Using the Laplace transform of (at + b)^n, where a, b are constants]

L{sin(-3t)} = -3/(s² + 9) [Using the Laplace transform of sin(at)]

L{cos(5t)} = s/(s² + 25) [Using the Laplace transform of cos(at)]

Step 2: Apply the linearity property of the Laplace transform to combine the individual transforms.

L{e+(2t - 1)² + sin(-3t) + cos(5t)} = L{e} + L{(2t - 1)²} + L{sin(-3t)} + L{cos(5t)}

= 1/s + (2/s)² - 3/(s² + 9) + s/(s² + 25)

= 1/s + 4/s² - 3/(s² + 9) + s/(s² + 25)

Therefore, the Laplace transform of the given expression is 1/s + 4/s² - 3/(s² + 9) + s/(s² + 25).

b) L^(-1) {1 / [(s + 1)(s² + 5 - 12)]}

To evaluate the inverse Laplace transform, we'll use partial fraction decomposition and the inverse Laplace transform formulas.

Step 1: Factorize the denominator.

(s + 1)(s² + 5 - 12) = (s + 1)(s² + 5 - 12)

= (s + 1)(s² + 4s - 7)

= (s + 1)(s + 7)(s - 1)

1 / [(s + 1)(s + 7)(s - 1)] = A / (s + 1) + B / (s + 7) + C / (s - 1)

For s^2 term: 0 = A + B + C

For s term: 0 = 6A - 6B + 8C

For constant term: 1 = -7A

From the third equation, A = -1/7. Substituting this into the second equation, we get -6/7 - 6B + 8C = 0, which simplifies to -6B + 8C = 6/7.

From the first equation, we get C = -A - B, which simplifies to C = 1/7 - B.

Substituting C into the equation -6B + 8C = 6/7, we have -6B

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Answer:

it is very hard but i am trying to help you.

Explanation:

Answer:

R=∆V/I=12/0.6=20ohm....

Answer:

the branch currents are as follows:

  top left: I2 = 0.625 A

  middle left: I1 = 2.500 A

  bottom left: I1-I2 = 1.875 A

  top center: I2+I3 = 2.500 A

  bottom center: I2+I3-I1 = 0 A

  right: I3 = 1.875 A

Explanation:

You can write the KVL equations:

Top left loop:

  I2(4) +(I2 +I3)(2) +I1(1) = 10

Bottom left loop:

  (I1-I2)(4) +(I1-I2-I3)(2) +I1(1) = 10

Right loop:

  (I2+I3)(2) +(I2+I3-I1)(2) = 5

In matrix form, the equations are ...

  \(\left[\begin{array}{ccc}1&6&2\\7&-6&-2\\-2&4&4\end{array}\right]\cdot\left[\begin{array}{c}I_1\\I_2\\I_3\end{array}\right] =\left[\begin{array}{c}10\\10\\5\end{array}\right]\)

These equations have the solution ...

  \(\left[\begin{array}{c}I_1\\I_2\\I_3\end{array}\right] =\left[\begin{array}{c}2.500\\0.625\\1.875\end{array}\right]\)

This means the branch currents are as follows:

  top left: I2 = 0.625 A

  middle left: I1 = 2.500 A

  bottom left: I1-I2 = 1.875 A

  top center: I2+I3 = 2.500 A

  bottom center: I2+I3-I1 = 0 A

  right: I3 = 1.875 A

_____

This can be worked almost in your head by using the superposition theorem. When the 5V source is shorted, the 10V source is supplying (I1) to a circuit that is the 4 Ω and 2 Ω resistors in parallel with their counterparts, and that 2+1 Ω combination in series with 1 Ω for a total of a 4Ω load on the 10 V source. That is, I1 due to the 10V source is 2.5 A, and it is nominally split in half through the upper and lower branches of the circuit. There is no current flowing through the (shorted) 5 V source branch.

When the 10V source is shorted, the 5V source is supplying a 4 +4 Ω branch in parallel with a 2 +2 Ω branch, a total load of 8/3 Ω. This makes the current from that source (I3) be 5/(8/3) = 15/8 = 1.875 A. There is zero current from this source through the 1 Ω resistor.

Nominally, the current from the 5V source splits 2/3 through the 2 Ω branch and 1/3 through the 4 Ω branch.

Using superposition, I2 = I1/2 -I3/3 = (2.5 A/2) -(1/3)(15/8 A) = 0.625 A. This is the same answer as above, without any matrix math.

  (I1, I2, I3) = (2.5 A, 0.625 A, 1.875 A)

__

It helps to be familiar with the formulas for resistors in series and parallel.

Science-based research is best suited to define the process of developing technologies that can be utilized to assist structures' survival activities. Option C is correct.

An approach to research where an issue is first recognized and then hypotheses that claim to be able to fix it are developed or tested using observations, and experiments.

Inventing technology that can be used to help buildings withstand activity is best described as a scientific endeavor.

Hence, option C is correct.

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Answer:

735

Explanation:

w=mg

w=75*9.8=735N

In order to determine the probability that an electron can be detected in the middle one-third of a well region, we need to take into account the wave function and the boundary conditions.The wave function represents the probability density of finding the electron in a particular location within the well. The boundary conditions are determined by the geometry of the well, which can be rectangular, triangular, or other shapes.

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Interferometry uses two or more telescopes to achieve higher resolution than a single telescope.

When light from two or more telescopes is combined, the waves interfere with each other.

This interference can be constructive, in which the waves add together to create a brighter signal, or destructive, in which the waves cancel each other out.

The pattern of constructive and destructive interference creates an interference pattern, which can be used to measure the size and shape of objects.

The resolution of an interferometer is determined by the distance between the telescopes.

The larger the distance, the higher the resolution. This is because the interference pattern is spread out over a larger area, which allows for more detail to be seen.

Interferometry is a powerful tool for astronomers, as it allows them to see objects that would be invisible to a single telescope. It is also used in other fields, such as medical imaging and engineering.

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Interferometry uses two or more telescopes combined to produce a resolution similar to that of a larger telescope. The resolution depends not on the size of the telescopes but on their separation. Advancements in technology and computing power have made it possible to separate larger interferometer arrays for greater resolution.

Interferometry uses two or more telescopes in an interferometer array to achieve a resolution equivalent to that of a single telescope with a diameter equal to the baseline separating the individual telescopes. Instead of interfering with each other, the telescopes in the interferometer array work cooperatively, utilising the technique of interference to achieve a superior resolution.

An interferometer combines electromagnetic radiation from two or more telescopes and the resolution depends not on their individual apertures but on their separation. As such, two telescopes separated by 1 kilometre, would provide the same resolution as a single dish 1 kilometre across, although they wouldn’t collect as much radiation.

Earlier, the size of interferometer arrays used to be limited because all the dishes needed to be physically connected. However, with current technology and increased computing power, larger interferometer separations can be achieved without requiring a physical connection between telescopes. The precise arrival of electromagnetic waves from space at each telescope can be timed and this data is later combined to yield an extremely high-resolution image.

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If someone would like to lease state-owned lands for oil and gas production, they should negotiate with the appropriate government agency responsible for managing the lands.

In the United States, this agency is typically the Bureau of Land Management (BLM), which manages millions of acres of federal lands, including lands with potential for oil and gas development. The BLM offers competitive leasing programs that allow individuals and companies to bid on leasing rights for specific parcels of land. The leasing process typically involves submitting an application, conducting an environmental analysis, participating in a lease sale auction. Ultimately, negotiation and leasing of state-owned lands for oil and gas production is subject regulations and oversight by  government agency responsible for managing  lands.

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The steepest angle to which a material can be piled without slumping/sliding downslope is referred to as the angle of repose.

The correct option is D.

The steepest angle of fall or dip in relation to the horizontal plane that a material may be piled to without collapsing is known as the angle of repose, or critical angle of repose, of a granular material. The materials on the slope face is almost ready to slide at this angle.

The design of particle material processing, storing, and conveying systems must take the angle of repose under consideration. The angle of repose is low when the grains are spherical and smooth. Its angle of repose is steep for extremely fine and adhesive materials.

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