what is the purpose of barrels filled with sand in front of an abutment (such as a support for a highway over pass)?there are used by work crews for the purposes of filling dangerous pot holes on the road.to reduce the force of impact on your vehicle by allowing your vehicle to travel farther than if it hit the abutment directly.the are used as temporary abutments.all of the above

Answer:

3) Act on different objects

Explanation:

Newton's third law of motion states that for every action there is an equal and opposite reaction.

Action-reaction force pairs make it possible for fishes to swim, birds to fly, cars to move, etc.

Basically, action-reaction force pairs are characterized by the following statements;

I. The forces are the same type such as magnetic force, contact force or gravitational force.

II. The forces are equal in magnitude but opposite in direction.

III. They act up on two different bodies.

Hence, the two forces that make up 3rd law of motion can act on different objects.

For example, while driving down the road, a bug strikes the windshield of a vehicle (Action) and makes a quite obvious mess in front of the face of the driver of the vehicle (Reaction) i.e the bug hit the vehicle and the vehicle hits the bug.

Answer:

1.)Reflection is the act of light reflecting back when it hits a medium on a plane. Refraction is the process by which light shifts its path as it travels through a material, causing the light to bend. Thus, this is the key difference between reflection and refraction. This phenomenon usually occurs in mirrors.

2.)ray diagrams are a visual representation of the propagation of light. They can help us to understand and visualise multiple situations, such as light being reflected off of a mirror or changing its direction while moving through a lens.

3.)Reflection: The process of sending back the light rays which fall on polished surface is called reflection of light.

Laws of reflection:

(i) The angle of reflection is always equal to the angle of incidence.

(ii) The incident rays, reflected rays and the normal, all lie in the same plane.

4.)Snell’s law formula is expressed as: μ= sin i/sin r

, where i is the angle of refraction, r is the angle of refraction and μ is known as the refractive index of the second medium with respect to the first medium.

Answer:

Explanation:

All of these are examples of electromagnetic radiation or energy.

The spectra comprises most energy and matter we can account for so far.

The main distinction between EM waves and for example longitudinal acoustic waves is the medium of energy transfer (and rules). EMWs are subject to the idiosyncratic effects of Quantum Mechanics while other 'macro' waves whose medium relies on gross material, are apparently not.

If it takes an object 3.5 seconds to make one revolution,  its frequency is 0.286 Hz.

The number of vibrations counted per second is called frequency. A wave is a group of vibrations that are referred to as energy. The bottom node is known as the crest, and the top node is known as the trough.

The frequency of an alternating current is the number of full cycles per second. The hertz, also known as Hz, is the accepted unit of frequency. The frequency of a current is 1 Hz if one cycle is completed per second; 60 cycles per second equals 60 Hz.

Frequency = 1/t

Frequency = 1/3.5

Frequency = 0.286 Hz

If it takes an object 3.5 seconds to make one revolution,  its frequency is 0.286 Hz

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Answer:

the answer is 32,400

Explanation:

I looked it up for you

The average speed denotes the average rate of speed over the extent of a trip. The average speed of a car which travels 270 meters in 30 seconds is 9m/s.

The average speed can be defined as the ratio of the total distance travelled by an object to the total time taken. It is a scalar quantity. It is represented by the magnitude and does not have direction. Its SI unit is m/s.

The average speed of an object help us to calculate the rate of travel time and the distance. The average speed of an object when it covers the same distance at two different speed, X and Y is:

Average speed = 2XY/ X+Y

The equation used here to calculate the average speed is:

Average speed = Total distance / Total time

Average speed  = 270 m / 30 s = 9 m/s

Thus the average speed is 9 m/s.

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Answer:

its false

Explanation:

The speed of the wave on a string is given by Taylor's formula:

where

F = tension force

μ = linear density = mass per unit length

But also we can say the speed of any wave is given by:

where:

λ = wave length

f = frequency

Plug the second equation in the first one. We get:

Now solve for f:

Lets say wave length is the same on the second case. Since it's the same string μ will also be the same.

See that 340 N = 2 x 170, so we can write:

The surface area of the filament is not directly calculable with the given information. More data, such as the dimensions or shape of the filament, is required to determine its surface area.

The temperature and emissivity only provide information about the thermal radiation emitted by the filament, not its physical characteristics. To calculate the surface area of the filament, you would need to know its shape, dimensions, and/or surface characteristics. Without these details, it is not possible to determine the surface area using just the temperature and emissivity. To find the surface area of the filament, we need to consider the Stefan-Boltzmann law, which relates the power radiated by an object to its temperature and emissivity. The equation is P = σ * A * e * T^4, where P is the power (75 W in this case), σ is the Stefan-Boltzmann constant, A is the surface area, e is the emissivity (0.5), and T is the temperature in Kelvin (2,600 K). Rearranging the equation to solve for A, we have A = P / (σ * e * T^4). Plugging in the given values, we can calculate the surface area of the filament.

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Answer:

There are two main ways to determine the age of a rock, these are Relative dating and Absolute dating. Relative dating is used to determine the relative order of past events by comparing the age of one object to another.

Explanation:

Explanation:

rock and fossils are made by layers of dirt, sand,organic matter that has beem compressed over thousands,if not millions of years.

some scientists use this layering to determine how old the earth is.

its kind of like looking at the rings of a tree to see how old it is.

the scientists look at each layer of the rock or fossil and use what they already know about when this type of soil or organic matter existed and try to piece together the past

Answer:

It is True that Humans are not the only animals that pollute the air.

True

Every animal exhales CO2, that's why they pollute the air too, except that it is much less than that of humans.

The presence of a keeper alters the magnetic field of a horseshoe magnet by providing a closed magnetic circuit, enhancing the magnet's strength and efficiency.

A horseshoe magnet consists of a U-shaped magnet with a North and South pole at its ends. The magnetic field lines of the magnet extend from one pole to the other, creating a loop. However, when the magnet is not in use, the magnetic field lines tend to spread out and weaken.

To prevent this dispersion and maximize the magnet's strength, a keeper is used. The keeper is a ferromagnetic material, such as iron or steel, that is placed across the open ends of the horseshoe magnet. By doing so, the keeper forms a closed magnetic circuit, allowing the magnetic field lines to flow through the keeper, effectively closing the loop.

This closed circuit prevents the magnetic field lines from spreading out and improves the magnet's efficiency. The presence of the keeper also enhances the magnet's overall magnetic strength, as the magnetic field is concentrated within the closed circuit, leading to a stronger magnetic force at the poles.

Thus, the keeper alters the magnetic field of the horseshoe magnet by providing a closed path for the magnetic field lines, increasing its efficiency and strength.

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Answer:

if you cut a bar of gold over and over it would result to an atom.

because an atom is the smallest particle of an element that can exist.

I hope this helps

The catch in this one is:  We don't know how much force the student used to push the bike.  

It wasn't necessarily the 100N.  That's just the weight of the bike. But you know that you can push a car, a wagon, or a bicycle hard, you can push it not so hard, you can give it a little push, you can give it a big push, you can push it strong, you can push it weak, you can push it medium.  The harder you push, the more it'll accelerate, but it's completely up to you how hard you want to push.  That's what's so great about wheels !  That's why they were such a great invention ! This is where I made my biggest mistake. This guy came into my store one day and said he's got this great invention, it's definitely going to take off, it'll be a winner for sure, he called it a "wheel".  I looked at it, I turned it over and I looked on all sides. I thought it was too simple.  I didn't know then it was elegant. I threw him out.  I was so dumb.  I could have invested money in that guy, today I would have probably more than a hundred dollars.

Anyway, can we figure out how much force the student used to push with ?  Stay tuned:

-- The bike covered 15 meters in 5 seconds.  Its average speed during the whole push was (15m/5s) = 3 meters/sec.

-- If the bike started out with no speed, and its average speed was 3 m/s, then it must have been moving at 6 m/s at the end of the push.

-- If its speed increased from zero to 6 m/s in 5 seconds, then its acceleration was (6m/s / 5 sec) = 1.2 m/s²

-- The bike's weight is 100N.  

(mass) x (gravity) = 100N

Bikemass = (100N) / (9.8 m/s²)

Bikemass = 10.2 kilograms

-- F = m A

Force = (mass) x (acceleration)

Force = (10.2 kg) x (1.2 m/s²)

Force = 12.24 N

-- Work = (force) x (distance)

Work = (12.24 N) x (15 m)

Work = 183.67 Joules

-- Power = (work done) / (time to do the work)

Power = (183.67 joules) / (5 seconds)

Power = 36.73 watts

Answer:

B. 40m

Explanation:

1. s = 0.29 s

2. m= 0.23m

3. k.E = 2.1J

i. d = ½ at2

t = (2d/a) = (2 A 0.40 m/9.8 m/s ) = 0.2857142857 s = ½ 2 ½

0.29 s

ii. d = vt = 0.8 m/s A 0.2857142857 s = 0.2285714286 m = 0.23 m

iii. KE = KE + PE

KEf

= ½ mv + mgh = 0.5 A 0.50 kg A (0.8 m/s) + 0.50 kg A 9.8 m/s A 0.40 m = 2.12 J =  2.1 J

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Answer: Because your mass is so much less than the mass of the Earth,

Explanation:

You can't feel your gravitational force. Because the Earth's gravity has the same pull on every object, all objects fall at the same speed (in a vacuum). On Earth, we have air. Air resistance will cause some objects to fall more slowly than others will.

Hope it helps I had this question too!

Have a good day

Answer:

well they make the siren go beacaus eyou are doing somthing wrong so what were you thinking

Explanation:

Answer:

4.2 km West of the start

Explanation:

Displacement is a vector quatitiy which means it has direction adn magnitude. It is the distance you are at the very end of the journey from the start.

We can assign one way as a positive direction and the other a negative and then add them

I will say that West is positive and East is negative:

(10.9) + (-6.7) = 4.2km

The equivalent resistance of the circuit is 0.67 ohms. The current through the circuit is 7.46 amps.

1/Req = 1/R1 + 1/R2 + 1/R3 + ...

In this case, we have three resistors connected in parallel, so:

1/Req = 1/R1 + 1/R2 + 1/R3

1/Req = 1/2.00 + 1/2.00 + 1/2.00

1/Req = 1.5

Req = 0.67 ohms

the equivalent resistance of the circuit is 0.67 ohms.

I = V/R

In this case, the voltage is 5V and the resistance is 0.67 ohms, so:

I = 5/0.67

I = 7.46 amps

Resistance is the measure of an object's ability to impede the flow of electric current through it. It is measured in ohms (Ω). Resistance is determined by the physical properties of an object, such as its dimensions, material, and temperature. When electric current flows through a conductor, it encounters resistance that slows down its flow. This resistance is caused by the collisions between electrons and the atoms in the conductor. The greater the number of collisions, the higher the resistance.

Resistance can be affected by changes in the physical properties of the conductor, such as length, cross-sectional area, or temperature. A longer or narrower conductor will have higher resistance, while a wider conductor will have lower resistance. The resistance of most materials increases with temperature. Understanding resistance is important for designing and operating electrical circuits. By controlling the resistance of a circuit, engineers can ensure that the correct amount of current flows to power the devices connected to it.

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Answer:

Atoms.

Explanation:

Atoms are purely one bit of an element. Ions are positive or negative atoms. Molecules are not pure, they have other stuff with it.

The maximum pressure of density 2.5g/cm cubed on a horizontal surface if the block measures 1000cm is \(0.0245 N/cm^2\) or 245 Pa.

To calculate the maximum pressure of density 2.5g/cm cubed on a horizontal surface if the block measures 1000cm, we need to use the formula:
Pressure = Force / Area
First, we need to find the mass of the block:
Mass = Density x Volume
Mass = \(2.5g/cm^3 * 1000cm^3\)
Mass = 2500g
Then, we need to find the force exerted by the block on the surface:
Force = Mass x Gravity
Force = 2500g x \(9.8m/s^2\)
Force = 24500N
Finally, we can calculate the maximum pressure by dividing the force by the area of the surface in contact with the block:
Pressure = Force / Area
Area = Length x Width = 1000cm x 1000cm = \(1000000cm^2\)
Pressure = 24500N / \(1000000cm^2\)
Pressure = \(0.0245 N/cm^2\) or 245 Pa

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Answer: Hot air is transferred through heat being radiated from a thermal burner.

The oven absorbs air from the environment and passes it through a thermal resistance (thermal burner) to heat it and then this hot air is the one that cooks the food.

Answer:

he is wronggg

Explanation:

Since Intensity depends on power and area, star b will have the same brightness as star a but look smaller

Luminous Intensity is the magnitude or quantity of the brightness of light emitted by a luminous object.

If two stars have the same luminosity, but star b is three times farther away from us than star a. If we are to compare star a with star b, star b will look bright but small.

The reason is due to the fact that Intensity is directly proportional to power and inversely proportional to area and not to the distance or length.

Therefore, star b will look bright but small.

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Straight pushes necessitate the use of 16 in. Raceway with conductors that are 4 awg or required.

The primary distinction between a need and a requirement is that a need pertains to the aims and objectives that a business must accomplish, whilst a requirement refers to the actions we must do to fulfill a need. The terms "need" and "requirement" are occasionally used interchangeably.

A subject, a verb, and a complete thought are necessary components of well-written, complete sentences. An entire statement must make sense by itself. Complete sentences are occasionally referred to as independent clauses. A clause is a collection of words that could be used to form a sentence.

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The change in internal energy when a system is heated with 35 j of energy while it does 15 j of work is +50 J. The correct option is a).

The change in internal energy of a system can be calculated using the first law of thermodynamics, which states that the change in internal energy (ΔU) of a system is equal to the heat (q) added to the system minus the work (w) done by the system:

ΔU = q - w

In this case, the system is heated with 35 J of energy while it does 15 J of work. Therefore:

q = 35 J

w = -15 J (negative because work is being done by the system)

Plugging these values into the equation above, we get:

ΔU = 35 J - (-15 J) = 35 J + 15 J = 50 J

Therefore, the change in internal energy (ΔU) is +50 J. Answer is option a. +50 J.

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Yes, the direction of conventional current can be opposite to the direction of charge movement under certain circumstances.

This can occur in situations where the charge carriers in a material have a negative charge, such as electrons, but the convention of current flow is defined as the direction of positive charge movement.

In most cases, the flow of electric current involves the movement of negatively charged electrons. Electrons move from the negative terminal of a power source (e.g., a battery) towards the positive terminal. This electron flow is opposite to the conventional current flow, which is defined as the direction of positive charge movement.

However, there are scenarios where positive charge carriers are involved, such as in ionic solutions or when considering the flow of positive ions in a plasma. In these cases, the conventional current flow aligns with the direction of the positive charge movement.

For example, in an electrolytic cell, positive ions (cations) move towards the negative electrode (cathode), while negative ions (anions) move towards the positive electrode (anode). The conventional current flow is defined as the direction of positive charge movement, so it aligns with the movement of the positive ions.

It's important to note that in most practical electrical circuits and conductors, electrons are the primary charge carriers, and the conventional current flow is opposite to the direction of electron movement. However, in specific scenarios involving positive charge carriers, the conventional current direction aligns with the direction of positive charge movement.

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A point charge of 5.0 × 10–7 C is moving to the right at 2.6 × 105 m/s in a magnetic field that is directed into the screen and has a field strength of 1.8 × 10–2 T.

To calculate the magnitude of the magnetic force acting on the charge, we can use the formula:F = qvBsinθ

where:F is the magnetic force acting on the charge q is the chargev is the velocity B is the magnetic field strengthθ is the angle between the velocity and the magnetic field

In this case, the charge is moving perpendicular to the magnetic field, so the angle between the velocity and the magnetic field is 90 degrees, and sinθ = 1. Therefore, the formula becomes:F = qvBPlugging in the values, we get:F = (5.0 × 10–7 C) × (2.6 × 105 m/s) × (1.8 × 10–2 T)F = 2.34 × 10–13 N

Therefore, the magnitude of the magnetic force acting on the charge is 2.34 × 10–13 N.

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