Assuming a constant density, the size of an object scales as its mass raised to what power?.

Answer:

B. A large number of atoms move from one place to another

Explanation:

Convection is heat transfer by the movement of atoms of a substance from one region to another across a temperature gradient. Since atoms of solids are rigidly held in place, convection only occurs in liquids and gases since they flow.

Convection occurs when the temperature of one region of a fluid (liquid or gas) is higher than its other region. There is thus a mass movement of atoms from one region to the other due to a temperature difference. The atoms will continue to move to the region of lower temperature until the temperature of both regions are the same at an equilibrium temperature.

The electric flux through the curved surface is given by Φ = EA, which is option (b).

The electric flux through a closed surface is defined as the total electric field passing through that surface. In this case, we have a curved surface with a constant electric field tangent to it.

The formula for electric flux is given by Φ = ∫E⋅dA, where Φ is the electric flux, E is the electric field, and dA is the differential area vector.

Since the electric field is tangent to the surface, we can write E⋅dA = E dA cosθ, where θ is the angle between the electric field and the differential area vector. Since the electric field and the differential area vector are parallel, θ = 0, and cosθ = 1. Thus, E⋅dA = EdA.

The integral then simplifies to Φ = E ∫dA = EA, where A is the total area of the curved surface.

Therefore, the electric flux through the curved surface is given by Φ = EA.

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A ball is attached to a string that is whirled around in a horizontal circle having the radius of r. If the radius of the circle is changed to r/4 and the same centripetal force is applied by the string, the new speed of the ball is one-half the original speed.

The formula for the centripetal force is

                 F = mv² / r

where F is the centripetal force

          m is the mass of the ball

          v is the velocity of the ball

          r is the radius of the circular movement

Let us rearrange the equation,

               \(\displaystyle v = \sqrt{\frac{Fr}{m}\)

If the radius of the circular movement is reduced as r/4, then the velocity becomes,

               \(\displaystyle v = \sqrt{\frac{Fr}{4m}\)

              \(\displaystyle v = \frac{1}{2} \sqrt{\frac{Fr}{m}\)

which means that if the radius is reduced by one of forth the original, then the velocity will be reduced by twice the original.

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The complete question is

A ball attached to a string is whirled around in a horizontal circle having a radius of r. If the radius of the circle is changed to r/4 and the same centripetal force is applied by the string, the new speed of the ball is which of the following?

 (A) One-quarter the original speed

 (B) One-half the original speed  

(C) The same as the original speed

(D) Twice the original speed

(E) Four times the original speed

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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Explanation:

R = \(\sqrt{(12.0)^{2} + (9.00)^{2}}\) = 15 UNIDADES

Answer:

tennis ball 0.07, Golf ball 1.37

Answer: step 6 answer is 0.07 g/cm3 and golf ball is 1.15 g/cm3

Explanation: doing lab.. step 6 answer on Edg

The heat of neutralization of acetic acid from -51 kj/mmol to calories per millimole is 12189.3 cal/mmol.

The heat of neutralization of a substance is the amount of heat given off when one mole of water is produced from the reaction of an acid and a base.

The heat of neutralization of different acids and bases varies.

The heat of neutralization of acetic acid is given as -51 kj/mmol.

This means that 51 kJ of heat is given when 1 mmole of acetic acid reacts with a base to form water.

To convert the heat of neutralization of acetic acid from -51 kj/mmol to calories per millimole, we use the conversion factor between energy in Joules and energy in calories.

The conversion factor is given below:

1 cal = 4.184 Joules

51 kJ = 51000 Joules

51000 Joules = 51000 * 1 cal / 4.184 Joules

51000 Joules = 12189.3 calories

Hence, the heat of neutralization in cal/mmol is  12189.3 cal/mmol

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The wave speed is given by the formula: wave speed = frequency x wavelength. Therefore, for the given wave with a frequency of 200 Hz and a wavelength of 12.7 cm, the wave speed is: wave speed = 200 Hz x 12.7 cm = 2540 cm/s

Since the maximum speed of the particles on the cord is the same as the wave speed, this means that the particles are moving at a maximum speed of 2540 cm/s as the wave travels along the cord.

This maximum speed of the particles occurs when the wave is at its peak or crest. At the point of equilibrium (i.e. when the wave is at its trough), the particles have zero velocity.

Thus, the particles on the cord oscillate back and forth about their equilibrium position with a maximum amplitude of 12.7 cm as the wave passes along the cord.

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The output force on the piece of food the chopsticks pick up is mechanical advantage times 3 N.

The force amplified by utilising a tool, mechanical device, or machine system is known as mechanical advantage. To achieve the desired output force amplification, the gadget trades off input forces against movement.

Mathematically:

mechanical advantage = output force/input force

Given that input force = 3 N.

Hence, output force = mechanical advantage × 3 N.

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Answer:

Protists are called plant-like, fungus-like and animal-like because they share some of the characteristics of plants, fungi and animals, even though they belong in a different category: the kingdom Protista.

Explanation:

The force acting on the object that has a mass of 540 kg is 1242 N. The correct answer is A.

The equation F = ma represents Newton's second law of motion, which states that the force acting on an object is directly proportional to its mass and the acceleration it experiences. This means that if we know the mass of an object and its acceleration, we can use this equation to calculate the force acting on it.

In this case, we are given that the mass of the object is 540 kg and the acceleration is 2.3 m/s². Using the equation F = ma, we can substitute the given values and calculate the force:

F = ma

F = 540 kg x 2.3 m/s²

F = 1242 N

Therefore, the correct answer is A.

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Approximately 47.37% of the soil volume is pore space, and approximately 52.63% is solid particles.

To calculate the percentage of pore space and solid particles in the soil volume, we can use the following formula:

Pore space percentage = ((Particle density - Bulk density) / Particle density) x 100

Solid particles percentage = 100 - Pore space percentage

Given:

Bulk density = 1.4 Mg/m³

Particle density = 2.66 Mg/m³

Substituting the values into the formulas:

Pore space percentage = ((2.66 - 1.4) / 2.66) x 100

Solid particles percentage = 100 - Pore space percentage

Calculating the values:

Pore space percentage ≈ 47.37%

Solid particles percentage ≈ 52.63%

Therefore, approximately 47.37% of the soil volume is pore space, and approximately 52.63% is solid particles.

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Answer:

A=Gas

B= Solid

C=Liquid

Explanation:

A gas has the particles dispersed everywhere

so A is the gas

Liquid and Solid have them more close together

but the solid has them in some order

so as you can see

B is solid

and

C is liquid

Answer:

6.67×10⁻⁸ cm³/g/s²

Explanation:

6.67×10⁻¹¹ Nm²/kg²

= 6.67×10⁻¹¹ (kg m/s²) m²/kg²

= 6.67×10⁻¹¹ m³/kg/s²

= 6.67×10⁻¹¹ m³/kg/s² × (100 cm/m)³ × (1 kg / 1000 g)

= 6.67×10⁻⁸ cm³/g/s²

The total torque created by the two known masses is 1.848 Nm.

We can use the formula for torque, which is given by:

τ = F x r x sin(θ)

where τ is the torque, F is the force applied, r is the distance from the pivot point to the point where the force is applied, and θ is the angle between the force and the lever arm.

For the first mass (193.1 g), the force applied is the weight of the mass, which is:

F1 = m1 x g = 0.1931 kg x 9.81 m/s^2 = 1.893 N

The distance from the pivot point to the point where the force is applied is half the length of the meter stick, which is:

r1 = L/2 = 0.5 m

The angle between the force and the lever arm is 90 degrees, so:

θ1 = 90 degrees

Using these values, we can calculate the torque created by the first mass as:

τ1 = F1 x r1 x sin(θ1) = 1.893 N x 0.5 m x sin(90 degrees) = 0.9465 Nm

For the second mass (183.9 g), we can follow the same procedure and find:

F2 = m2 x g = 0.1839 kg x 9.81 m/s^2 = 1.803 N

r2 = L/2 = 0.5 m

θ2 = 90 degrees

τ2 = F2 x r2 x sin(θ2) = 1.803 N x 0.5 m x sin(90 degrees) = 0.9015 Nm

The total torque created by the two known masses is the sum of these individual torques, which is:

τtotal = τ1 + τ2 = 0.9465 Nm + 0.9015 Nm = 1.848 Nm

Therefore, the total torque created by the two known masses is 1.848 Nm.

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The maximum length of the cantilever that can be built is approximately 0.63 m.

When answering questions on Brainly, it is important to always be factually accurate, professional, and friendly. It is also important to be concise and not provide extraneous amounts of detail. It is recommended to use the following terms in your answer if they are relevant to the question being asked.

For example, in the question "you must build the cantilever shown in the figure. the maximum length of cable you have available is 5 m and the maximum tension the cable can support is 245 n.

the material used for the cantilever has a density of 40 kg per meter length of the cantilever. what is the maximum length (in m) of the cantilever that you can build?",

one would need to use terms such as cantilever, cable, tension, and density in their response.In order to calculate the maximum length of the cantilever that can be built, the following formula can be used:

L = T / (d * g)Where L is the maximum length of the cantilever,

T is the maximum tension the cable can support, d is the density of the cantilever material, and g is the acceleration due to gravity (9.8 m/s^2).Plugging in the given values, we get:

L = 245 / (40 * 9.8) ≈ 0.63 m

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The area of reaserch in which Kepler worked is the area of  the retrograde motion of the sun.

Kepler is most known for his popular laws that deal with the idea of planatary motion. There are three laws of planetary motion as described by Kepler.

Hence, the area of reaserch in which Kepler worked is the area of  the retrograde motion of the sun.

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Answer:

its actually D.the retrograde motion of mars

Answer:

v = √2gh

v = 7 m / s

Explanation:

For this exercise we can use the law of conservation of energy

starting point. In the roof

         Em₀ = U = m g h

final point. On the floor

          Em_f = K = ½ m v²

as there is no friction, the energy is conserved

          Em₀ = Em_f

          m g h = ½ m v²

          v = √2gh

In the exercise the height of the ceiling is not indicated, but in general the height of the ceiling of a house is h = 2.5 m

         v = √ (2 9.8 2.5)

         v = 7 m / s

Answer:

400 kg-m/s

Explanation:

Given that,

Mass of the woman, m = 50 kg

Initial velocity, u = 8 m/s

Final velocity, v = 0 m/s

We need to find the change in momentum of the woman. It can be given by :

\(\Delta p=m(v-u)\\\\=50\times (8-0)\\\\=400\ kg-m/s\)

So, the change in momentum is 400 kg-m/s.

The integral of 1/(1 + x²) is (1/2)ln|1 + x²| + C where C is the constant of integration.

Integration is a mathematical process of finding the antiderivative of a function. To integrate the given expression 1/(1 + x²), we will use the substitution method.

Let u = 1 + x², du/dx = 2x dx, then dx = du/2x and the integral becomes:

∫1/(1 + x²) dx = ∫1/u * (1/2x) du= (1/2)∫1/u du

The antiderivative of 1/u is ln|u| + C, where C is the constant of integration.

Therefore, the final solution of the integral is (1/2)ln|1 + x²| + C.

Let us work through the steps:

Step 1:Let u = 1 + x² and then differentiate both sides with respect to x to obtain du/dx. du/dx = 2x

Substitute 2x dx = du into the integral ∫1/(1 + x²) dx to get the integral in terms of u:∫1/u * (1/2x) du = (1/2) ∫1/u du

Step 2:Calculate the antiderivative of 1/u, which is ln|u|. Thus, the final solution is (1/2)ln|1 + x²| + C, where C is the constant of integration. The constant C will vary depending on the initial conditions of the problem.

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Answer:

B. A large current forms, drops to zero, then a smaller current forms in the opposite direction

Explanation:

The results of Lionel observation about electromagnetic induction is as follows:

In the first step, a large current will form because of the fast or quick movement of the magnet into the right end of a solenoid that generates a  induces emf.

In the second step, the magnet was in rest position for 3 s so the current drops to zero because according to Faraday's law, no voltage will be generated if the magnet held stationary and no voltage means no current.

In the third step, smaller current forms in the opposite direction as the magnet is slowly moving away from the solenoid generating a smaller voltage.

Hence, the correct answer is "B."

Answer:

B

Explanation:

The buoyant force on a floating object is the force exerted by a fluid on an object that is submerged or floating within it.

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Explanation:

The force would be net positive.

ANSWER

EXPLANATION

The voltage, E, is related to the number of windings, W, by the equation:

To find the number of windings that will produce 760 V, we have to solve for W when E is 760 V. That is:

That is the answer.

A gravitational force is always attractive in nature and a magnetic force is attractive in nature between two opposite poles and repulsive in nature between two same pole.

Gravity and magnetism are not the same thing. These two ideas or expressions are entirely dissimilar from one another. Despite the fact that both are regarded as forces, they are two distinct forces with various traits and features.

First of all, gravity works between two objects regardless of their composition because it is a separate force. There will be gravitational forces between the items as long as they have mass. Any two things will be drawn toward one another by gravity or another gravitational force if they have mass.

Magnetism, on the other hand, mostly depends on the unique characteristics of the object. There are two directions for the magnetic force. It has the power to draw things together as well as away from one another. The orientation of the electrons inside the items also affects how magnetism behaves. With gravity and gravitational force, this is not the case.

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Answer:

2.5 A

Explanation:

Ohms law is a physical law relating the voltage difference between two points, the electric current flowing between them, and the resistance of the path of the current. Mathematically, the law states that V = IR, where V is the voltage difference, I is the current in amperes, and R is the resistance in ohms. It is can easily be deduced from the foregoing that the voltage is directly proportional to current and the resistance is the constant of proportionality.

From ohm's law;

R= 6Ω

V= 15V

I= ???

V=IR

I= V/R

I= 15 V/6Ω

I= 2.5 A

Hi there!

We can begin by finding the angular velocity using dimensional analysis:

\(\frac{1 rev}{0.56 s} * \frac{2\pi rad}{1 rev} = 11.22 rad/sec\)

(A)

Find the flea's velocity using the following relationship:

v = ωr

v = (11.22)(0.20) = 2.24 m/s

(B)

Centripetal acceleration is given by:

a = ω²r

a = (11.22²)(0.20) = 25.18 m/s²

The speed of light in a medium, such as plastic, is given by the equation v = c/n, where v is the speed of light in the medium, c is the speed of light in vacuum (approximately 3 x 10^8 m/s), and n is the refractive index of the medium. To determine the speed of red light in plastic, the refractive index of the specific plastic material must be known.

The wavelength of light in a medium can be determined using the equation λ = λ0/n, where λ is the wavelength of light in the medium, λ0 is the wavelength of light in vacuum, and n is the refractive index of the medium. Given that the red laser has a wavelength of 633 nm (633 x 10^-9 m) in vacuum, the wavelength of red light in plastic can be calculated using the refractive index of the plastic material.

In conclusion, to determine the speed and wavelength of red light in plastic, the specific refractive index of the plastic material needs to be known.

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The acids are sour flavour, dissolves some metals and turns litmus paper red.

The bases are bitter flavour, feels slippery and turns litmus paper to blue.

The German word for acid, sauer, describes its sour flavour. Since hydrochloric acid, which is used to digest food, can harm cells, our stomachs require a special lining to shield it from this acid. Acids are something we're all familiar with; they're present in tomatoes, citrus fruits, and vinegar. There are numerous varieties of salts in chemistry, and acids react with most metals, including magnesium, to produce hydrogen gas.

When two substances come into contact, corrosive substances will cause a chemical reaction that will damage or destroy the other substances.

On contact, bases feel slick. This is due to their ability to alter protein structure. Because it begins to harm the proteins in your skin, a strong base can result in severe chemical burns.

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