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How could you explain that two objects of the same volume have different buoyancy in water???

HELP ITS URGENT

The current passing through the potentiometer wire, given the resistivity of 20 × 10⁻⁸ ohm meter and the area of cross-section of 4 × 10⁶ m², is approximately 200 Amperes.

The resistivity of a potentiometer wire is given as 20 × 10⁻⁸  ohm meter, and the area of cross-section is 4 × 10⁶ m². We need to calculate the current (I) passing through the wire.
To find the current, we can use Ohm's law:

V = IR,

where V is the voltage, I is the current, and R is the resistance. In this case, the resistance is given by the resistivity (ρ) multiplied by the length (L) divided by the area of cross-section (A).
We can rearrange the formula to solve for I:
I = V / R
I = V / (ρ * L / A)
I = V * A / (ρ * L)
Since we are not given the voltage or length, we cannot determine the exact value of the current. However, we can still provide a general explanation.
Assuming the voltage across the wire is 1 volt and the length of the wire is 1 meter, we can substitute these values into the equation to get an approximate answer:
I = (1 V) * (4 × 10⁶ m²) / (20 × 10⁻⁸  ohm meter * 1 m)
I ≈ 200 A
In conclusion, the current passing through the potentiometer wire, given the resistivity of 20 × 10⁻⁸ ohm meter and the area of cross-section of 4 × 10⁶ m², is approximately 200 Amperes.

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The correct relation for the standard heat solution of calcium chloride CaCl2 salt can be expressed as:

ΔH°soln(CaCl₂) = -120 kJ/mol

Here, ΔH°soln(CaCl₂) represents the standard heat of solution of calcium chloride, which is the amount of heat absorbed or released when one MOLE of calcium chloride is dissolved in water under standard conditions (25°C and 1 atm pressure). The negative sign indicates that the process is exothermic, meaning that heat is released when the salt dissolves in water. The value of -120 kJ/mol represents the magnitude of the heat released per mole of CaCl₂ dissolved in water.

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Work done to lift the stone of mass 5.9 kg is 28.91 J.

The work done through pressure is made of the displacement and the component of the carried-out force of the object inside the direction of displacement. whilst we push a block with a few pressure ' F ' the body movements with a few accelerations, paintings are carried out. paintings executed is written as W = F.

The paintings executed by using pressure are defined to be manufactured from the aspect of the force in the path of the displacement and the significance of this displacement. formula. work can be calculated by multiplying pressure and Distance within the course of force as follows. W = F × d.

Work is achieved whenever a pressure actions something over a distance. you can calculate the strength transferred, or work carried out, by multiplying the pressure via the space moved in the route of the pressure.

Calculation:-

mass = 5.9

g = 9.8 m/s

f = 0.5 m

work done = mgh

                   = 5.9 × 9.8 × 0.5 J

                  = 28.91 J

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The moment of inertia of the flywheel is approximately 0.0337 kg·m^2.

To solve this problem, we can use the formula for rotational kinetic energy:

KE = (1/2) I ω²

where KE is the kinetic energy of the flywheel, I is its moment of inertia, and ω is its angular velocity.

We can first convert the angular velocity from revolutions per minute (rpm) to radians per second (rad/s):

ω = (11000 rpm) * (2π rad/rev) * (1 min/60 s) = 1146.13 rad/s

Next, we can plug in the values for KE and ω and solve for I:

KE = 4.9 MJ = 4.9 × 10⁶ J

ω = 1146.13 rad/s

(1/2) I ω² = KE

(1/2) I (1146.13 rad/s)² = 4.9 × 10⁶ J

I = (2 * 4.9 × 10⁶J) / (1146.13 rad/s)²

I = 0.0337 kg·m²

Therefore, the moment of inertia of the flywheel is approximately 0.0337 kg·m².

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Answer:

0.2 hours

Explanation:

Answer:

Microwaves

Radiowaves.

Answer:

radio waves

microwaves

infrared (IR)

visible light

ultraviolet light (UV)

X-rays

gamma rays

Explanation:

these are the electromagnetic spectrum. they are arranged in decreasing wavelength and increasing energy and frequency.

Answer:

the static charge is not always distributed on the surface of the conductor, there are also charges in the volume but of lesser magnitude

Explanation:

In this hypothetical system the electric force is of type

       F = \(k' \frac{q_1 q_2 }{r^2}\)

in this case the force decays to zero much faster,

if we call Fo the force of Coulomb's law

         F₀ = \(k \frac{q_1 q_2 }{r^2}\)

assuming the constant k is the same

the relationship between the two forces is

        F / F₀ = 1 / r

        F = F₀ / r

when analyzing this expression the force decays much faster to zero.

In an electric conductor, charges of the same sign may not feel any repulsive force from other charges that are at a medium distance, so there is a probability that some charges are distributed in the volume of the material, this does not happen with coulomb's law

Consequently, the static charge is not always distributed on the surface of the conductor, there are also charges in the volume but of lesser magnitude

On the Moon, the astronaut's inertia will not change.

The characteristic of a substance that causes that substance to be at rest or to move continuously in a straight path is known as inertia.

The amount of inertia an object has depends on its mass; the more massive the object, the more inertia it has, and the less massive the object, the less inertia it has.

The weight of an object is calculated as the sum of its mass and gravitational acceleration.

W = mg

where m is the mass of the object and g is the acceleration due to gravity

Only the weight of the astronaut will vary due to variations in the degree of acceleration caused by gravity, keeping the astronaut's mass constant.

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none of the above. According to Newton's third law of motion, for every action, there is an equal and opposite reaction.

In this case, if Joshua is attracted toward Earth by a 500 N gravitational force, then by Newton's third law, Earth is also attracted toward Joshua with an equal and opposite force of 500 N. The gravitational force between two objects is always mutual and equal in magnitude but opposite in direction.

Newton's third law of motion states that for every action, there is an equal and opposite reaction. This means that when an object exerts a force on another object, the second object exerts an equal and opposite force on the first object. The forces always occur in pairs and act on two different objects.

For example, if you push against a wall with a certain amount of force, the wall pushes back on you with an equal amount of force in the opposite direction. Another example is the propulsion of a rocket. The rocket pushes exhaust gases backward, and in response, the gases push the rocket forward with an equal force.

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The correct option is option e) cross product

The cross-product is a new way of "multiplying" two vectors. It results in a new vector that is perpendicular to both the original vectors and its magnitude is given by the area of the parallelogram formed by the two original vectors.

In three-dimensional space, cross-product is a binary operation on two vectors. It yields a vector perpendicular to both vectors. a b represents the vector product of two vectors, a and b. Its resulting vector is parallel to a and b. Cross goods are another name for vector products.

The cross-product has four basic applications:

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Answer:

Explanation:

v=u+at

Final velocity v=0 , u=35m.s, a=-a , t=0.02

a=u/t = 35/0.02 = 1750 m/s2

force = mass * acceleration = 0.15 * 1750 = 262.5N

Answer:

с

creates its own light, which is blocked by the Sun during an eclipse.

Explanation:

might not be right but its what i remember

Answer:

i don't know.. but it get to me every day..

Explanation:

Light is radiant energy in the form of a wave of electromagnetic energy.

Light is a form of electromagnetic radiation that is visible to the human eye. It is made up of a stream of energy particles, called photons, that travel in a wave-like pattern. It has various properties, including intensity, color, and direction, which can be used to explain its behavior. It can be described as having both a particle-like nature and a wave-like nature. The particle-like nature of light is exhibited in the way it travels in packets of energy, known as photons. The wave-like nature of light is demonstrated by the way it can be bent, diffracted, and refracted.
The intensity of light is determined by the amount of energy that a photon has. The color of light is determined by the wavelength of the light, with different colors having different wavelengths. Direction is also an important property of light, as it determines how light will be bent when it passes through an obstacle or is reflected off of a surface.
Light plays a critical role in the lives of humans and other organisms. It is used in vision, to help organisms understand the world around them. Light also has numerous applications in science and technology, such as in communications, photography, and solar energy.
In conclusion, light is a form of electromagnetic radiation composed of photons that travel in a wave-like pattern. It has various properties, including intensity, color, and direction, that are used to explain its behavior. Light is important for vision and has various uses in science and technology.

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Answer:

well that means they are driving 100 mph

so it will take them less than an hour and a half

Answer:

750W

Explanation:

40×10= 400N

work done= force × distance

=400 × 75

=30000 J

Power= work done/ time

= 30000 ÷ 40

= 750 W

Refraction occurs when a light ray passes from one medium to another with a different refractive index. Therefore, option 3 is the correct answer.

A) Refraction occurs when a light ray passes from one medium to another with a different refractive index. The angle of incidence is the angle between the incoming light ray and the normal, while the angle of refraction is the angle between the refracted light ray and the normal. According to the laws of refraction, the angle of incidence and the angle of refraction are related by the ratio of the refractive indices of the two media. In situations where the angle of incidence is greater than the critical angle, total internal reflection occurs instead of refraction.
Looking at the four situations depicted in the drawing, we can see that only situation 1 shows a possible refraction. This is because the angle of incidence is smaller than the angle of refraction, which indicates that the refracted ray bends away from the normal, as expected based on the relative refractive indices of the two media. In situations 2, 3, and 4, the angle of incidence is larger than the angle of refraction, which violates the laws of refraction and is therefore not physically possible.
B) Total internal reflection occurs when a light ray travels from a medium with a higher refractive index to a medium with a lower refractive index, and the angle of incidence is greater than the critical angle. The critical angle is the angle of incidence at which the angle of refraction is 90 degrees. If the angle of incidence exceeds the critical angle, the light ray is reflected back into the original medium instead of refracting into the second medium.
Without doing any calculations, we can see that option 3 shows a pair of refractive indices where total internal reflection is not possible. This is because the refractive index of medium B is 1.00, which is the lowest possible value for a refractive index. If medium A has a higher refractive index than 1.36, then the critical angle will be smaller than 45 degrees, and total internal reflection will not occur. Therefore, option 3 is the correct answer.

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The sun is Yellow, red, orange, and blue. Therefore option B is correct.

The star is moving toward an observer. Therefore option B is correct.

39. The type of radioactive decay represented by the equation provided Gamma. Therefore option A is correct.

40. The statement is completed correctly by the information which states that the coal in Alberta has a lower carbon content than coal in other parts of Canada, resulting in reduced greenhouse gas emissions.

29. graph B depicts the relationship between gravitational field strength and the mass of the International Space Station orbiting Earth.

30. The correct sequence of colors representing the changing temperature from the surface to the atmosphere of the sun is Yellow, red, orange, and blue. Therefore option B is correct.

1. When a star undergoes a blue shift, it indicates that the star is moving toward an observer. Therefore option B is correct.

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Porter's Five Forces is a framework used to analyze the competitive intensity and attractiveness of an industry. The five forces are: Threat of New Entrants, Bargaining Power of Suppliers, Bargaining Power of Buyers, Threat of Substitute Products or Services and Intensity of Competitive Rivalry.

Threat of New Entrants: This force considers the ease or difficulty for new competitors to enter an industry. It includes barriers to entry such as high capital requirements, economies of scale, brand loyalty, and government regulations.

Example: The airline industry is known for its high barriers to entry due to the significant capital required to purchase aircraft, establish routes, and secure necessary licenses and permits. Additionally, established airlines often have loyal customer bases and strong brand recognition, making it challenging for new entrants to compete effectively.

Bargaining Power of Suppliers: This force assesses the power suppliers have over the industry in terms of pricing, quality, and availability of inputs. It considers factors such as the concentration of suppliers, uniqueness of their products, and their ability to forward integrate.

Example: In the smartphone industry, major suppliers of components like microchips and display screens hold significant bargaining power. These suppliers provide essential inputs, and their products may have limited alternatives or require specialized manufacturing processes. As a result, smartphone manufacturers must negotiate favorable terms with these suppliers to ensure a reliable supply chain and competitive pricing.

Bargaining Power of Buyers: This force examines the power customers have in influencing prices, demanding better quality or service, and potentially switching to alternative products or suppliers. It considers factors such as buyer concentration, product differentiation, and switching costs.

Example: The retail industry experiences strong buyer power, particularly in highly competitive markets. Customers have access to various options, and their ability to compare prices and products easily through online platforms empowers them to demand competitive pricing, promotions, and high-quality products and services.

Threat of Substitute Products or Services: This force looks at the availability of alternative products or services that can satisfy customer needs. It considers factors such as price-performance trade-offs, switching costs, and customer loyalty.

Example: The rise of streaming services such as Netflix, Amazon Prime Video, and Hulu posed a significant threat to traditional cable and satellite TV providers. These streaming platforms offer a wide range of content at competitive prices, allowing customers to switch from traditional TV services to streaming options, resulting in a decline in subscriber numbers for traditional providers.

Intensity of Competitive Rivalry: This force evaluates the level of competition among existing firms in the industry. It considers factors such as the number and size of competitors, industry growth rate, product differentiation, and exit barriers.

Example: The soft drink industry, dominated by major players like Coca-Cola and PepsiCo, experiences intense competitive rivalry. These companies fiercely compete for market share through advertising campaigns, new product launches, pricing strategies, and distribution channels. The rivalry is further intensified by the high market saturation and the limited scope for differentiation among similar products.

The interconnection of these forces lies in their collective influence on the competitive dynamics and profitability of an industry. Changes in one force can trigger a chain reaction that impacts the others. For instance, a high threat of new entrants may lead to increased competitive rivalry as existing firms strive to defend their market share. Similarly, a strong bargaining power of buyers can limit the pricing power of suppliers and impact their profitability. Understanding these interconnections helps businesses assess the overall attractiveness and competitive landscape of an industry and develop appropriate strategies to thrive within it.

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In an incompressible flow, the speed at which an acoustic wave propagates depends on the physical properties of the medium through which it is traveling. Generally speaking, the speed of an acoustic wave in an incompressible flow is slower than in a compressible flow, since the latter can support pressure waves that move faster than sound.

The speed of an acoustic wave in an incompressible flow can be calculated using the following formula:

c = √(K/ρ)

where c is the speed of the wave, K is the bulk modulus of the medium (a measure of its resistance to compression), and ρ is its density.

For example, if we assume a bulk modulus of 2.3 GPa and a density of 1000 kg/m^3 (typical values for water), we get a speed of approximately 1500 m/s for an acoustic wave in an incompressible flow.

It's worth noting that this speed can vary depending on the exact conditions of the flow, as well as any obstructions or other features that might affect the propagation of the wave. Nonetheless, the above formula provides a useful starting point for understanding the speed of acoustic waves in incompressible flows.

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Answer: Newton’s 1st law- a body at rest will remain at rest, and a body in motion will remain in motion unless acted on by an external force

Newton’s 2nd law- the force acting on an object is equal to the mass of that object times it’s acceleration

News 3rd law- for every action, there is an equal and opposite reaction

Hope this helps!

Explanation:

Answer:

your answer is changing

Explanation:

Louis Pasteur's "swan-necked flask" experiments, which demonstrated that bacteria did not develop spontaneously in sterile liquid, revealed that the hypothesis of spontaneous creation was untrue.

A type of lab flask created by the French scientist Louis Pasteur is the swan-necked flask. The flask features a long, curved neck with a swan-like bend that allows air to enter and exit the container while keeping out airborne microbes. In his tests on spontaneous generation, Pasteur utilised the swan-necked flask to show that bacteria do not emerge spontaneously in sterile liquids. Pasteur sterilised a soup by boiling it in a swan-necked flask to remove any exterior contaminants, supporting the biogenesis theory that living things can only evolve from earlier life forms. Today, the swan-necked flask is still employed in microbiology as a technique of shielding research from contamination.

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Answer: In general, airplane tracks are flat, they do not have cant, consequently the friction force is what keeps the bicycle in the circle.

Let's use Newton's second law, let's set a reference frame with the horizontal x-axis and the vertical y-axis.

Y axis y

    N- W = 0

    N = W

X axis (radial)

       fr = m a

the acceleration in the curve is centripetal

        a =

the friction force has the expression

       fr = μ N

we substitute

      μ mg = m v²/r

      v =

we calculate

     v =

     v = 1,715 m / s

to compare with the cyclist's speed let's reduce to the SI system

       v₀ = 18 km / h (1000 m / 1 km) (1 h / 3600 s) = 5 m / s

We can see that the speed that the cyclist is carrying is greater than the speed that the curve can take, therefore the cyclist will SKID

Explanation:

Answer:

debits on the bank statement

The magnetic Lorentz force, which has a magnitude and direction, is applied to an electron with a direction and velocity. Magnetic fields are created by electric charges moving.

Other moving charges are subject to magnetic fields' forces. The magnetic Lorentz force is the influence a magnetic field has on a charge q travelling at a velocity v.

In honour of Dutch physicist Hendrik A. Lorentz, the electromagnetic force F acting on the charged particle as a whole is referred to as the magnetic Lorentz force and is calculated using the formula F = qE + qv B. The electric field is responsible for the first phrase. The magnetic field and velocity are both perpendicular to the direction of the second term, which is the magnetic force.

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Answer:

The thermal efficiency, \(\eta _{reheat}\), of the Rankine cycle with reheat is 36.81%

Explanation:

p₁ = 8 MPa = 80 Bars

T₁ = 450°C = 723.15 K

From steam tables, we have;

v₁ = 0.0381970 m³/kg

h₁ = 3273.23 kJ/kg

s₁ = 6.5577 kJ/(kg·K) = s₂

The p₂ = 0.8 MPa

T₂ = Saturation temperature at 0.8 MPa = 170.414°C = 443.564 K

h₂ = 2768.30 kJ/kg

\(T_{2'}\) = 400°C = 673.15 K

\(h_{2'}\) = at 400°C and 0.8 MPa = 3480.6 kJ/kg

p₃ = 10 kPa = 0.1 Bar

T₃ = Saturation temperature at 10 kPa = 45.805 °C = 318.955 K

h₃ = 2583.89 kJ/kg

h₄ = \(h_{3f}\) = 191.812 kJ/kg

The thermal efficiency, \(\eta _{reheat}\), of a Rankine cycle with reheat is given as follows;

\(\eta _{reheat} = \dfrac{\left (h_{1}-h_{2} \right )+\left (h_{2'}-h_{3} \right )-W_{p}}{h_{1}-\left (h_{4}+W_{p} \right )+\left (h_{2'}-h_{2} \right )}\)

Therefore, we have;

\(\eta _{reheat} = \dfrac{(3273.23 -2768.30 ) + (3480.6 -2583.89 ) - 8.04)}{(3273.23 -(191.812 + 8.04) + (3480.6 -2768.30 ) } = 0.3681\)

Which in percentage is 36.81%.

The concentration of salt in water affects the specific heat capacity by changing the thermal properties of the solution, causing it to require less heat to be raised in temperature.

The specific heat capacity of water is the amount of heat required to raise the temperature of a certain mass of water by 1 degree Celsius. The concentration of salt in water affects its specific heat capacity because the presence of ions in the solution changes the thermal properties of the water.

As the concentration of salt in water increases, the specific heat capacity of the solution decreases. This is because the ions in the salt solution require less heat to be raised in temperature than pure water molecules. Additionally, the ions in the salt solution also increase the mobility of water molecules, causing them to transfer heat more efficiently and therefore, the heat energy required to raise the temperature of the solution is reduced.

It should be noted that the effect of salt concentration on specific heat capacity is small, and significant changes in specific heat capacity usually require very high salt concentrations. Nevertheless, the change in specific heat capacity can have a significant impact on the thermal dynamics of systems such as oceans, which contain high salt concentrations.

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When you go to the moon, your mass remains the same, but your weight decreases significantly. This is because weight is the force exerted by gravity on an object, and the moon's gravitational pull is much weaker than that of Earth.

Mass is a fundamental property of an object and remains constant regardless of the location. Therefore, when you go to the moon, your mass remains the same as it was on Earth. Mass is a measure of the amount of matter in an object and is independent of gravitational forces.

Weight, on the other hand, is the force exerted by gravity on an object. It depends on the mass of the object and the strength of the gravitational field it is in. The moon has a much weaker gravitational field compared to Earth. The moon's gravity is about 1/6th of Earth's gravity. As a result, when you go to the moon, the force of gravity acting on your body decreases significantly, leading to a decrease in your weight.

The decrease in weight on the moon is due to the inverse square law of gravitational attraction. The gravitational force between two objects decreases with the square of the distance between them. Since the distance between you and the moon is greater than the distance between you and Earth, the gravitational force on you is much weaker on the moon. Therefore, you will feel lighter and experience a significant decrease in weight when you go to the moon.

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