What is the resistance of:
A 2.00 m long copper wire that is 0.400 mm in diameter?
A 10.0 cm long piece of carbon with a 0.800 mm × 0.800 mm square cross section?

Answer:

I believe it is True... I hope it is correct :)

Explanation:

Answer : False

Explanation :

Explanation:

don't know don't know don't know

If the lead can be extracted with 92.5 efficiency, the mass of ore is required to make a lead sphere with a 7.00 cm radius is 17.707 kg.

To find the mass of ore, the given values are,

The radius of the lead sphere is r = 7.0 cm,

The lead can be extracted with, η = 92.5% = 0.925 efficiency.

Density is the substance's mass per unit of volume.

We know the density of lead as,

⇒ p = 11.4 g/cm³ .

The volume of the lead sphere is,

V = 4/3πr³

   = 4/3π(7)³

V = 1436.7 cm³.

Mass of the lead present in the lead sphere is,

m = p . V

    = 11.4  × 1436.7

    = 16379 g

m = 16.379 kg

From the expression of efficiency, we calculate the mass of the ore,

η = Mass of lead obtained / Mass of the ore to be taken

0.925 = 16.379 kg / Mass of the ore to be taken

Mass of the ore to be taken = 17.707 kg

If the lead can be extracted with 92.5 efficiency, the mass of ore is required to make a lead sphere with a 7.00 cm radius is 17.707 kg.

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Answer:

juuhu

Explanation:

jjj

Answer:

500 kW

Explanation:

Given that,

Energy of the train, E = 2 MJ = 2×10⁶ J

Time, t = 4 seconds

We need to find the power of the train. We know that,

Power = energy/time

So,

\(P=\dfrac{2\times 10^6}{4}\\\\P=500000\ W\\\\or\\\\P=500\ kW\)

So, the power of the train is equal to 500 kW.

Hello!

Answer:

The answer is D

Wish you luck!

Answer:

Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!

Explanation:Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!Meine Mama hat mir einfach erlaubt das ich Cola Trinken darf wie cool ist das bitte! Jetzt zock ich Fortnit.e und trink Cola! YIPEEE!

Answer:

Speed

Explanation:

The answer is speed. It doesn’t affect potential energy because it’s associated with position. But since kinetic energy is associated with motion speed affects it.

Answer:

You spent 1680000 cents, or $16,800

Answer:

Acceleration, a = 295.36 m/s²

Explanation:

Given the following data;

Final velocity = 41.35 m/s

Initial velocity = 0 m/s

Time = 0.140 seconds

To find the acceleration, we would use the first equation of motion;

V = U + at

Where;

V is the final velocity.

U is the initial velocity.

a is the acceleration.

t is the time measured in seconds.

Substituting into the equation, we have;

41.35 = 0 + a*0.140

41.35 - 0 = 0.140a

41.35 = 0.140a

Acceleration, a = 41.35/0.140

Acceleration, a = 295.36 m/s²

The kinetic energy of a person with a mass of 51 kilograms and running at 4.0 m/s is calculated to be 408.0 joules (J) .

The formula for kinetic energy is KE = (1/2)mv², where KE represents the kinetic energy, m is the mass of the object, and v is the velocity of the object. In this case, we are given the mass of the person as 51 kilograms and the velocity as 4.0 m/s.

Substituting these values into the formula, we have KE = (1/2)(51 kg)(4.0 m/s)².

First, we square the velocity term: (4.0 m/s)² = 16.0 m²/s².

Next, we multiply the squared velocity by the mass: (1/2)(51 kg)(16.0 m²/s²) = 408.0 kg·m²/s².

The units kg·m²/s² are equivalent to joules (J), which is the unit of energy.

Therefore, the kinetic energy of the person is 408.0 joules (J).

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Answer:

6

Explanation:

Half the wave = 3

Wavelength = 3 x 2 = 6

Answer:

When the elevator is accelerating downward, the person feels lighter due to the downward normal force being less than the person's weight.

Explanation:

A person riding in an elevator subjected to a series of unbalanced forces depending on the direction the elevator is travelling.

Two forces are acting on the person; the force of gravity and the upward normal force from the elevator.

When the elevator is going upwards with acceleration a, the person feels heavier than his normal weight, due to the upward normal force being greater than the person's weight. N = mg + ma

When the elevator is moving downwards with acceleration a, the person feels lighter due to the downward normal force being less than the person's weight. N = mg - ma

However, when the elevator is moving up or down at constant velocity ie. acceleration a = 0, the person experience a normal force equal to weight. N = mg

When the elevator is moving downwards with acceleration a = g, the person experiences weightlessness. N = (mg - mg) = 0

The measure that assesses media weight based on both reach and frequency is Gross Rating Points (GRPs).

GRPs are a metric commonly used in advertising and media planning to evaluate the impact and effectiveness of media campaigns. They quantify the total exposure or weight of a media plan by combining the reach (the percentage of the target audience reached by the campaign) and the frequency (the average number of times the target audience is exposed to the campaign).

GRPs are calculated by multiplying the reach percentage by the frequency. For example, if a campaign reaches 40% of the target audience with an average frequency of 3, the GRPs would be 120 (40% × 3 = 120).

Media mix (a) refers to the combination of different media channels used in a campaign. Share of voice (c) measures a brand's advertising presence relative to its competitors. Cost per thousand (CPM) (d) is a metric that calculates the cost of reaching one thousand individuals or households.

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To determine the force required to keep a 10 mg water droplet moving in the circular arc created by a shaking dog's fur, we can use the centripetal force formula:

F = m * (v^2 / r)

Where F is the centripetal force, m is the mass of the droplet, v is the velocity of the fur, and r is the radius of the circular arc.

Converting the mass of the droplet to kilograms:

m = 10 mg = 10 * 10^(-6) kg

Substituting the given values:

F = (10 * 10^(-6)) * ((2.5)^2 / 0.16)

Calculating this expression gives us the centripetal force required to keep the droplet moving in the circular arc.

To find the ratio of this force to the weight of the droplet, we divide the centripetal force by the weight of the droplet. The weight of the droplet can be calculated using the formula:

Weight = mass * gravitational acceleration

Let's assume the gravitational acceleration to be approximately 9.8 m/s^2.

Weight = (10 * 10^(-6)) * 9.8

Finally, we can calculate the ratio of the centripetal force to the weight of the droplet by dividing the centripetal force by the weight.

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Answer:

I = 20 A

Explanation:

The question says that, "A load of 6,000 C is conducted through a cross section in 5 minutes. Determining-if a current is not correct, we will find the value of?"

We have,

Charge, q = 6,000 C

Time, t = 5 minutes = 300 s

We need to find the current. We know that, the charge flowing per unit time is equal to current. So,

\(I=\dfrac{q}{t}\\\\I=\dfrac{6000}{300}\\\\I=20\ A\)

So, the current flowing through the circuit is 20 A.

Answer:

Actually, the sun goes a bit down, like it's not all the way up as to summer. How I know is that you actually can go online maybe search for some videos and see proof, I don't really know how to explain it.

Explanation:

Reason #1: If you check, go out for 12 hours and see, I think the sun is a little down.

Reason #2:

The earth’s axis is tilted.

From a Brainly user of this question for more info:

The Earth is NOT farther away from the sun in USA Winter, and NOT closer to the sun in USA Summer. In 2021, we will be NEAREST to the sun on January 2, and FARTHEST from the sun on July 5 !

NEAREST to the sun next Saturday.

FARTHEST from the sun next July 5.

Answer:

It's a fatty insulation.

Explanation:

"Myelin" is a fatty substance which insulates the axons of the nerve cells. Therefore, it covers the axons. This makes choice A correct and choice C incorrect.

This allows faster neural communication or hastens the transmission of signals between neurons. This makes choice A incorrect and choice E incorrect. It doesn't inhibit neural communication nor does it slow down neuronal operation; rather, it increases both speed.

Myelin can be affected by illness. An example of this is the disease called "Multiple Sclerosis," which targets the myelin sheath.

The sum of the kinetic and potential energies of particles in an object called mechanical energy.

Mechanical energy is the energy possessed by an object due to its motion or due to its position. This energy is derived from the work done on an object.

It can be in the form of kinetic energy, the energy of motion; or in the form of potential energy, the energy an object has due to its position or shape.

Mechanical energy can be converted between the two forms, and is often converted into other forms, such as electrical energy or thermal energy.

Mechanical energy is used to power machines and devices, and is an important source of energy in the modern world.

Therefore, The sum of the kinetic and potential energies of particles in an object called mechanical energy.

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Answer:

The correct option is;

b. How high the barbell is being lifted

Explanation:

The work done in lifting the 160 N barbell is equal to the potential energy gained by the barbell in the final elevated position of the barbell

Therefore, in order to find the work done to lift the barbell, we can calculate the potential energy gained by the barbell when it is placed at height

The work done to lift the barbell = The potential energy, P.E., gained by the barbell

The potential energy of an object, P. E. = The mass of the object, m × The acceleration due to gravity, g × The height to which the barbell is lifted, h

∴ Mathematically, P.E. = m × g × h

Weight, W = Mass, m × The acceleration due to gravity, g

The weight, W of the barbell is given as W = 160 N

∴ W = m × g = 60 N

From which we have;

P.E. = m × g × h = W × h

∴ The work done to lift the barbell = P.E. = 60 N × h = 60 N × The height to which the barbell is lifted.

Therefore the information which need be known is the height to which the barbell.

dP/dt = (0.831 - 0.2P) / 100, where P represents pressure (in kilopascals).

This equation represents the rate at which the pressure is changing with the given conditions of temperature and volume.

To find the rate at which the pressure is changing, we need to use partial derivatives. Given the equation PV = 8.31T, we can differentiate both sides of the equation with respect to time t.

Differentiating both sides with respect to time t, we get:

P(dV/dt) + V(dP/dt) = 8.31(dT/dt)

Now, let's substitute the given values:

dT/dt = 0.1 K/s (rate of temperature change)

dV/dt = 0.2 L/s (rate of volume change)

T = 300 K (temperature)

V = 100 L (volume)

Plugging in the values into the equation:

P(0.2) + 100(dP/dt) = 8.31(0.1)

0.2P + 100(dP/dt) = 0.831

Now, we can solve for dP/dt:

100(dP/dt) = 0.831 - 0.2P

dP/dt = (0.831 - 0.2P) / 100

Therefore, the rate at which the pressure is changing when the temperature is 300 K and increasing at a rate of 0.1 K/s, and the volume is 100 L and increasing at a rate of 0.2 L/s is given by:

dP/dt = (0.831 - 0.2P) / 100

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According to Moran, the evidence points to pleiotrophy and energy savings as two key factors in the cavefish eye loss.

Mexicanus was created through natural selection, pleiotropy, and genetic drift, not through human initiative. Organisms get what they need via natural selection. The fish must conserve energy to avoid going blind. Fish lose their eyes because they are unnecessary.

The Mexican tetra (Astyanax mexicanus) has been evolving in caves for the last few million years in forms that are blind. The loss of eyes is a major benefit for creatures living in the dark since maintaining eyes and the visual regions of the brain requires a lot of energy. The cavefish instead "sees" by sucking.

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The friction between the two solid surfaces depends on the weight of the objects on the surface and the roughness of the object surfaces.

When the two bodies are in contact such that a force acts to restrict the motion of each body, then the force is known as frictional force. And the phenomenon is called friction.

The expression for the frictional force is given as,

\(F = \mu \times N\)

Here,

\(\mu\) is the frictional coefficient and N is the normal reaction. (N = mg)

Clearly, the frictional force is dependent on the frictional coefficient of the surfaces and in turn, depends on the roughness of object surfaces. Also, friction depends on a normal reaction whose value is equivalent to the weight of objects on the surface.

Thus, we can conclude that the friction between the two solid surfaces depends on the weight of the objects on the surface and the roughness of the object surfaces.

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Answer:

A,d

Explanation:

the weight of the objects and the roughness of the objects’ surfaces i took the test

Answer:

transverse waves

Explanation:

this is because the definition of transverse waves is transverse waves are waves that travel perpendicular to the direction of the wave motion

however the definition of longitudinal waves is that longitudinal waves are waves that travel parallel to the direction of the wave motion.

so you can see the parallel means it forms compressions and rarefactions

but perpendicular means the particles will move up and down to the straight horizontal line, that's how lines are perpendicular right? ,

so the answer is transverse wave

hope this helps

please mark it brainliest

Answer:

B

Explanation:

While answer C may sound correct, Answer B is makes more sense. We know you cant use High-beam lights when u cant see ongoing traffic because it could affect the other driver coming across from you. Its good to use it when legal and safe, but in that term I still don't believe there's no reason for HIGH-beamed. That's this leaves B, when you are on u lighted streets.

The acceleration of the string is 4.3 m/s2.

We regard the positive direction for the vertical motion of mass m1 to be downward and the positive direction for the motion of mass m2 on the incline to be to the right and parallel to the incline.

There are only two ways to accelerate: changing your speed or changing your direction, or changing both. This is because velocity is both a speed and a direction.

Changing the speed at which an object is travelling is what acceleration is all about. A substance is not accelerating if its velocity is not changing. The information on the right depicts an object that is speeding as it moves northward.

Therefore, The acceleration of the string is 4.3 m/s2.

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.

Objects move relative to background such that it is covered and  uncovered  - start walking, the changes that occur in the surfaces, contours and textures provide information for perception.

Signals from the ocular, vestibular, and proprioceptive systems, among others, are used to perceive motion. One sensory system's knowledge is not reliable on its own.

The current illusion demonstrates how motion signals present throughout the scene affect how an object's perceived location is perceived. Evidently, the predominate motion signals across significant portions of visual space affect how any specific object's motion and location are perceived.

The visual system uses the shifting retinal image to deduce the trajectory and 3D structure of the moving object. The visual system infers the motion and structure of an object when the viewer is still and the object is moving.

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Answer:

Vector, scalar, scalar, vector

Explanation:

When you see a measurement followed by a direction ( up, down, north, east, etc.), it is usually a vector quantities

When you see a plain measurement such as 4.2s, 6 ft, it is usually a scalar one.

Answer:

B: C + O2 = CO2

Explanation:

In Chemistry,a synthesis reaction is one that occurs when two or more reactants combine in such a manner that they form a single product.

Looking at the options, the only one where 2 reactants combine to form a single product is option C where Carbon reacts with Oxygen to form carbon (IV) oxide.