What is the magnitude of force A,B

Answer:

direction

size

Explanation:

Vectors are physical quantities with both magnitude or size and direction.

Scalars are physical quantities with only size but not direction.

When describing a vector, on must specify its magnitude and direction.

Only the size of scalar quantities are needed to describe them.

When the fighter plane opens the fire, its momentum will be in backward direction and its speed decreases.When pursued plan opens fire in backward direction.then the momentum of plane will be in forward direction and its speed increases.

Answer:

JAJAJA

Explanation:

you need to learn but the answer is your sus jajaja

The expression for the energy stored (E) in a stretched wire of original length (L), cross-sectional area (A), tension (T), and Young's modulus (Y) is given by E = Y * e * ln(L) * A

The work done to stretch the wire can be calculated by integrating the force applied over the displacement. In this case, the force applied is the tension (T) in the wire, and the displacement is the change in length (ΔL) from the original length (L) to the stretched length (L + ΔL).

The tension in the wire is given by Hooke's law, which states that the tension is proportional to the extension of the wire:

T = Y * (ΔL / L)

where Y is the Young's modulus of the material of the wire.

Now, let's calculate the work done to stretch the wire:

dW = T * dL

Integrating this expression from L to L + ΔL:

W = ∫ T * dL = ∫ Y * (ΔL / L) * dL

W = Y * ΔL * ∫ (dL / L)

W = Y * ΔL * ln(L) + C

Here, C is the constant of integration. Since the energy stored in the wire is zero when it is unstretched (ΔL = 0), we can set C = 0.

Finally, the expression for the energy stored in the wire (E) is:

E = W = Y * ΔL * ln(L)

or, if we substitute the cross-sectional area (A) and strain (e) of the wire, where e = ΔL / L:

E = Y * e * ln(L) * A

Thus, the expression for the energy stored (E) in a stretched wire of original length (L), cross-sectional area (A), tension (T), and Young's modulus (Y) is given by:

E = Y * e * ln(L) * A

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As the voltage is increased, the power losses would decrease.

We now that the term power loss has to do with the loss that occurs as a result of the heating effect of current. The transmission of power at high voltage tends to reduce the power losses that accompanies the transmission of power at a lower voltage and a high current.

As such, when we have the operating voltage of a power line is increased from 300 kV to 600 kV we can see that the voltage has doubled and this would mean that the transmission is now at a much higher voltage which would reduce the power losses even further.

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When the aerodynamic center shifts from 0.25c to 0.5c during supersonic flight, it can negatively impact the stability of a conventional aircraft.

The aerodynamic center is the point along the chord line of an aircraft's wing where lift forces act. In subsonic flight, it is typically located around 0.25 times the chord length from the leading edge. However, as the aircraft transitions into supersonic speeds, shockwaves form on the wing's surface, causing the aerodynamic center to move backward to around 0.5 times the chord length.

This shift in the aerodynamic center affects stability because it changes the relative positions of the center of gravity (CG) and the aerodynamic center. In a stable aircraft, the CG should be positioned ahead of the aerodynamic center. However, if the aerodynamic center moves too far back, it can cause the CG to be located behind it, leading to reduced stability and potential control issues. Therefore, the shift in the aerodynamic center during supersonic flight requires careful design considerations to maintain stability and control.

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If the environmental lapse rate (ELR) of the atmosphere surrounding a rising parcel of air is greater than the dry adiabatic rate (DAR) of 10°C/1000m, certain conditions and phenomena can be inferred.

When the ELR is steeper than the DAR, it indicates a condition of instability in the atmosphere.

This means that the surrounding air cools at a faster rate than a rising parcel of air would if it were undergoing adiabatic cooling.

As a result, the parcel of air becomes warmer compared to its surroundings, making it less dense and causing it to continue rising.

The steep ELR exceeding the DAR signifies an environment conducive to the development of convective processes such as thunderstorms, cumulus clouds, and other forms of unstable atmospheric phenomena.

The increased lapse rate creates an environment where the parcel of air continues to rise and can reach higher altitudes, potentially leading to the formation of significant weather events and atmospheric instability.

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Hey there!

Answer:

9.4 million kilometers (km) converted to light years would be 9.93580784e-7 I believe.

Hope this helps!

Toasting a piece of bread is an example of a chemical change. It can't be reversed that's why it is irreversible.

During toasting, the heat causes a chemical reaction in the bread known as the Maillard reaction. This reaction occurs between the amino acids and the reducing sugars in the bread, which results in the formation of new compounds, including melanoidins, which give the bread its characteristic brown color and flavor.

Furthermore, toasting also involves the evaporation of water from the bread, which changes its texture and makes it crispier.

Therefore, toasting a piece of bread involves chemical changes in the bread's composition, resulting in the formation of new compounds, which is why it is considered a chemical change.

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Answer:Magnet

Explanation:

Answer:

Magnet

Explanation:

To determine the maximum mass of coal the barge can carry in freshwater without sinking, we need to consider its buoyancy and weight. Buoyancy is the force that allows the barge to float and is equal to the weight of the water displaced by the barge. The weight of the barge and its cargo must not exceed the buoyant force to prevent sinking.

Assuming the barge has a rectangular shape, we can calculate its volume using the formula V = l x w x h, where l is the length, w is the width, and h is the height of the barge. Let's assume the barge is 30 meters long, 10 meters wide, and 4 meters high. Therefore, the volume of the barge is V = 30 x 10 x 4 = 1200 cubic meters.

Since the barge is made of 4.6-cm-thick steel plates on each side and the bottom, we need to calculate the weight of the steel and subtract it from the buoyant force. The density of steel is approximately 7850 kg/m^3. The total surface area of the barge is (2 x 30 x 4 + 2 x 10 x 4 + 30 x 10) = 280 square meters. Therefore, the mass of the steel in the barge is:

mass of steel = density x volume x thickness
mass of steel = 7850 x 280 x 0.046
mass of steel = 97,724 kg

Next, we need to calculate the buoyant force acting on the barge. The density of freshwater is 1000 kg/m^3. Therefore, the weight of the water displaced by the barge is:

weight of water = density x volume
weight of water = 1000 x 1200
weight of water = 1,200,000 kg

Finally, we can calculate the maximum mass of coal the barge can carry in freshwater without sinking:

maximum mass of coal = weight of water - weight of barge and steel
maximum mass of coal = 1,200,000 - (97,724 + weight of coal)

Assuming the density of coal is approximately 1300 kg/m^3, we can calculate the volume of coal that the barge can carry:

volume of coal = (weight of coal) / (density of coal)

Substituting this in the previous equation and solving for the maximum mass of coal, we get:

maximum mass of coal = 1,200,000 - (97,724 + volume of coal x 1300)

Solving for the maximum volume of coal, we get:

volume of coal = (1,200,000 - 97,724) / 1300
volume of coal = 882.7 cubic meters

Therefore, the maximum mass of coal the barge can carry in freshwater without sinking is:

maximum mass of coal = volume of coal x density of coal
maximum mass of coal = 882.7 x 1300
maximum mass of coal = 1,146,510 kg

In conclusion, the barge can carry a maximum of 1,146,510 kg of coal in freshwater without sinking, assuming the barge has a rectangular shape with dimensions of 30 x 10 x 4 meters and is made of 4.6-cm-thick steel plates on each side and the bottom.

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Answer:

E

Explanation:

All others conduct electricity and heat.

Answer:

E.Rubber

Explanation:

Rubber is the best insulator, they have them coated around electricity wires, while metals are good conductors.

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Answer:

all of the above

Explanation:

they all require speed to beat

Answer:

All of the above

Explanation:

if your taking any kind of quiz or even review and there's a choice of "all of the above" it's always right because that answer won't be on every question!

Answer:

0.71s

Explanation:

From Newton's law of motion ;

V =U +gt

V is the final velocity or speed

U is the initial velocity or speed

g is acceleration of free fall due to gravity given as 9.8m/S2

Note when a body moves horizontally down its said to do so with the aid of the force of gravity

Hence the final velocity is aided by gravity.

From the above formula;

t =V-U/ g

t= 12-5/ 9.8 = 0.71s

Answer: .71

Explanation:

Khan academy

Answer:

Electric charge. A fundamental property that leads to the electromagnetic interactions among particles that make up matter.

Answer:

c. 0.80

Explanation:

they will choose the path that has not resistance

Answer:

a. decrease

b. increase

c. stay the same

Explanation:

Potential energy is when there's no movement

Kinetic energy is when there is movement

The total energy will stay the same bc the kinetic energy is at 100 (or increasing to 100) while the potential energy is at 0 (or decreasing to 0)

As kids sled down a hill, their potential energy will decrease, their kinetic energy will increase, and their total energy (PE + KE) will stay the same.

Kinetic energy (KE) is the energy possessed by a moving body due to its motion. Work must be done to change the kinetic energy of an object. The kinetic energy is expressed as K.E = ½mv²  where ‘m’ is the mass of the object and ‘v’ is the velocity of the object.

Potential Energy (P.E) is the energy that is stored by an object due to its position and is expressed in the form of an equation as P.E = mgh where ‘m’ is the mass of the object, ‘g’ is the acceleration due to gravity and ‘h’ is the height in meters.

Kinetic energy can be transferred from one body to another but potential energy is not transferable.

When the kids were at the top of the hill, their potential energy was maximum and their K.E. was zero. As they move down the hill their potential energy will decrease, and their kinetic energy will increase. But from the law of conservation of energy, their total energy (PE + KE) will stay the same.

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cells are the basic unit of all living things

Answer:

Cell

Explanation:

Because I took this class last year and also learned it in biology

The time required for the bacteria concentration to be reduced to 15ppm using the Newton's method is 8.12 hours.

Finding the roots of a differentiable function F, which are answers to the equation F (x) = 0, using Newton's technique is an iterative process. To solve this problem, we can use Newton’s method with an initial guess of t=6 and a stopping criterion of 1% (tol=0.01). The formula for Newton’s method is:

xₙ₊₁ = xₙ - f(xₙ)/f'(xₙ)

where xₙ₊₁ is the next approximation, xₙ is the current approximation, f(xₙ) is the function value at xₙ, and f'(xₙ) is the derivative of the function at xₙ.

For this problem, we have:

f(t) = 77 \(e^{-1.5 t}\) +20 \(e^{-0.08 t}\) - 15

f’(t) = -115.5 \(e^{-1.5 t}\) - 1.6 \(e^{-0.08 t}\)

After using the Newton’s method with an initial guess of t=6 and a stopping criterion of 1% (tol=0.01), the results are as follows:

t = 4.139 hours

You can check your result with fsolve function in Python’s scioy library.

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Answer:

in region AB the body was not moving

in region BC the body was moving forward with a increasing velocity therefore accelerating constantly

in region CD the body was moving with a constant velocity hence zero acceleration

in region DE the body was moving backwards decelerating

Answer:

I believe the answer is b

Explanation:

Answer:

mark me Brainliest

Explanation:

light cannot travel around objects

Answer:

Translucent objects allow light to pass through them but they distort it.

Explanation:

Example: frosted or stained glass. Opaque objects do not allow light to pass through them. Example: brick walls, human beings.

Answer:

Classical physics predicted that the light given off by an object as its temperature increased is that the energy of the light would increase from visible light into the ultraviolet range

Explanation:

The phenomena are referred to as Black body radiation. When a substance heats up, its electrons become excited. An electron will occasionally descend to a lower state and produce a photon. The frequency of emitted light increases with increasing temperature.

This is also how incandescent light bulbs operate. The majority of the light we see from stars is caused by black body radiation, and we may deduce the temperature of a star based on its hue. Plank's Law is the equation that gives the energy emitted as a function of frequency and temperature.

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Answer:

Once you have drawn the free-body diagram, you can use vector addition to find the net force acting on the object. We will consider three cases as we explore this idea:

Case 1: All forces lie on the same line.

If all of the forces lie on the same line (pointing left and right only, or up and down only, for example), determining the net force is as straightforward as adding the magnitudes of the forces in the positive direction, and subtracting off the magnitudes of the forces in the negative direction. (If two forces are equal and opposite, as is the case with the book resting on the table, the net force = 0)

Example: Consider a 1-kg ball falling due to gravity, experiencing an air resistance force of 5 N. There is a downward force on it due to gravity of 1 kg × 9.8 m/s2 = 9.8 N, and an upward force of 5 N. If we use the convention that up is positive, then the net force is 5 N - 9.8 N = -4.8 N, indicating a net force of 4.8 N in the downward direction.

Case 2: All forces lie on perpendicular axes and add to 0 along one axis.

In this case, due to forces adding to 0 in one direction, we only need to focus on the perpendicular direction when determining the net force. (Though knowledge that the forces in the first direction add to 0 can sometimes give us information about the forces in the perpendicular direction, such as when determining frictional forces in terms of the normal force magnitude.)

Example: A 0.25-kg toy car is pushed across the floor with a 3-N force acting to the right. A 2-N force of friction acts to oppose this motion. Note that gravity also acts downward on this car with a force of 0.25 kg × 9.8 m/s2= 2.45 N, and a normal force acts upward, also with 2.45 N. (How do we know this? Because there is no change in motion in the vertical direction as the car is pushed across the floor, hence the net force in the vertical direction must be 0.) This makes everything simplify to the one-dimensional case because the only forces that don’t cancel out are all along one direction. The net force on the car is then 3 N - 2 N = 1 N to the right.

Case 3: All forces are not confined to a line and do not lie on perpendicular axes.

If we know what direction the acceleration will be in, we will choose a coordinate system where that direction lies on the positive x-axis or the positive y-axis. From there, we break each force vector into x- and y-components. Since motion in one direction is constant, the sum of the forces in that direction must be 0. The forces in the other direction are then the only contributors to the net force and this case has reduced to Case 2.

If we do not know what direction the acceleration will be in, we can choose any Cartesian coordinate system, though it is usually most convenient to choose one in which one or more of the forces lie on an axis. Break each force vector into x- and y-components. Determine the net force in the x direction and the net force in the y direction separately. The result gives the x- and y-coordinates of the net force.

Example: A 0.25-kg car rolls without friction down a 30-degree incline due to gravity.

We will use a coordinate system aligned with the ramp as shown. The free-body diagram consists of gravity acting straight down and the normal force acting perpendicular to the surface.

We must break the gravitational force in to x- and y-components, which gives:

F_{gx} = F_g\sin(\theta)\\ F_{gy} = F_g\cos(\theta)F

gx

​

=F

g

​

sin(θ)

F

gy

​

=F

g

​

cos(θ)

Since motion in the y direction is constant, we know that the net force in the y direction must be 0:

F_N - F_{gy} = 0F

N

​

−F

gy

​

=0

(Note: This equation allows us to determine the magnitude of the normal force.)

In the x direction, the only force is Fgx, hence:

F_{net} = F_{gx} = F_g\sin(\theta) = mg\sin(\theta) = 0.25\times9.8\times\sin(30) = 1.23 \text{ N}F

net

​

=F

gx

​

=F

g

​

sin(θ)=mgsin(θ)=0.25×9.8×sin(30)=1.23 N

Hubble space telescope, Hubble deep field guide, moon, mercury, Saturn, sun, galaxy messier 101

Answer:

1-Hubble Deep Field Galaxy

2-Galaxy Messier 101

3-Sun

4-Saturn

5-Mercury

6-Moon

7-Hubble Space Telescope

Five activities that will see the application of relation between pressure and area include:

When the handle of a pump is squeezed, the pressure inside the tire increases, causing the tire to inflate. By adjusting the size of the opening in the showerhead, the water pressure can be increased or decreased.

When a car is placed on a hydraulic lift, the pressure in the lift's cylinder is increased, causing the lift to raise the car off the ground. When a hydraulic jack is used to lift a heavy object, the pressure in the jack's cylinder is increased, causing the jack to lift the object.

A blood pressure cuff uses pressure to measure the blood pressure in a person's artery. The pressure in the cuff is increased until it is high enough to stop the flow of blood, and then the pressure is slowly released. The pressure readings at various points during this process can be used to determine a person's blood pressure.

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Answer:

down below

Explanation:

Since we aren't the given the time, lets say that an object to 25 seconds to fall 50 meters. We can use the formula [ s = d/t ] to solve.

s = 50/25

s = 2

Therefore, the object was falling at a rate of 2 meters per second.

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a) The magnitude of the force that the string tension exerts on the airplane varies at different points of the trajectory due to the changing direction and speed of the airplane. When the airplane is at the beginning of its trajectory, the force of string tension is at its highest.

This is because the airplane is being pulled forward by the tension in the string, which opposes the backward force of air resistance. As the airplane moves along its trajectory, the magnitude of the string tension force decreases because the airplane gains speed and experiences less resistance. At the midpoint of the trajectory, the string tension force is at its minimum as the airplane reaches its maximum speed. Finally, as the airplane reaches the end of its trajectory, the magnitude of the string tension force increases again as the airplane slows down and the air resistance force becomes more significant.

b) The magnitude of the sum of the forces (the net force) exerted on the airplane varies at different points of the trajectory due to the balance or imbalance of the forces acting on the airplane. At the beginning of the trajectory, when the airplane is starting to move, the net force is not zero.

It is equal to the difference between the force of string tension and the force of air resistance. As the airplane gains speed and reaches the midpoint of the trajectory, the net force becomes zero because the force of string tension equals the force of air resistance. At this point, the airplane is moving at a constant speed. Finally, as the airplane reaches the end of its trajectory and slows down, the net force becomes nonzero again, with the force of air resistance exceeding the force of string tension.

In summary, the magnitude of the force that the string tension exerts on the airplane and the magnitude of the sum of the forces exerted on the airplane vary at different points of the trajectory due to changes in speed, direction, and the balance of forces.

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Answer:

Mass = 64,870,000,000 kilograms

Explanation:

Given the following data;

Density = 998 kg/m³

Volume = 6,500,000 m³

To find the mass of water in the reservoir;

Density can be defined as mass all over the volume of an object.

Simply stated, density is mass per unit volume of an object.

Mathematically, density is given by the equation;

Density = mass/volume

Making mass the subject of formula, we have;

Mass = density * volume

Mass = 998 * 6,500,000

Mass = 64,870,000,000 kilograms