A cyclical motion occurs because of density differences in the mantle. Heated, less dense lower regions of the fluid mantle rise, and denser, cooler regions sink due to gravity. The combined motions serve as the engine for crustal plate movement.


A. convection currents

B. subduction

C. density circles

D. seafloor spreading

Answer:  For Plato students the correct answer is

#2. Frost wedging could cause cracks in the rocks.

#4. Tall, powerful waves could carry the rock into the ocean.

#5. The rock could react to seawater, break down, and be carried away by the sea.

Explanation:  There were so many different answers given by everyone but this is the correct answer if you are on Plato

Final answer:

Acceleration is directly proportional to force when mass is constant, according to Newton's second law of motion, which can be represented by the formula F = ma.

Explanation:

According to Newton's second law of motion, when the mass is constant, acceleration is directly proportional to the force applied to a system. In simpler terms, if you apply more force to an object of constant mass, its acceleration will increase. Conversely, if you apply less force, the acceleration decreases. Newton's second law can be expressed with the formula F = ma, where F stands for force, m for mass, and a for acceleration.

This relationship implies that for a given mass, the acceleration is always in the same direction as the force applied. If you push an object forward, it will accelerate forward. When the mass of the system does not change, the equation simplifies the understanding of how force affects the system's motion. The constant mass ensures that any change in force results in a proportional change in acceleration.

Final answer:

An open switch causes an open circuit and prevents current flow, not a short circuit. A short circuit occurs when a low-resistance pathway inadvertently connects the two sides of a voltage source, causing excessive current flow.

Explanation:

An open switch in an electrical circuit represents a discontinuity where no current can flow, effectively having a value of 0, while a closed switch allows current to pass through, having a value of 1. However, an open switch cannot cause a short circuit because a short circuit occurs when there is a low-resistance pathway connecting the two sides of a voltage source, which bypasses the normal load in a circuit. Instead, an open switch leads to an open circuit, where there is a break or gap preventing electrical flow. A short circuit may happen in a scenario where a piece of wire or another conductor inadvertently connects the two sides of a voltage source, causing a large current to flow and potentially overheating the wire.

In the case of holiday lights mentioned in the question, each bulb has a shunt that allows current to flow around the bulb, creating a temporary short circuit when the bulb burns out. This mechanism ensures the rest of the lights stay on. However, if too many bulbs burn out, the shunts themselves can fail (open), causing a section of the string to go dark because the circuit has been interrupted.

Answer:

d. Newton's first law

I hope this helps you

The steel barrier in a truck acts as a protective measure due to Newton's first law of motion, or the law of inertia, which states that objects in motion tend to stay in motion unless acted upon by an unbalanced force.

The concept or principle that best explains why the cab of a truck is often separated from the load by a steel barrier is Newton's first law of motion. This law, also known as the law of inertia, states that an object at rest stays at rest, and an object in motion remains in motion with the same speed and in the same direction unless acted upon by an unbalanced force. In the case of a truck, if it were to suddenly stop or be involved in a collision, the load would tend to continue moving due to inertia. The steel barrier is there to prevent the load from entering the cab and possibly harming the occupants.

Inertia is a fundamental aspect of Newton's first law, indicating the resistance of any physical object to a change in its state of motion. The barrier serves as a safety feature to protect against the dangers posed by inertia; without it, any objects in the load could cause injury to those in the cab during a sudden stop or crash due to their tendency to keep moving forward.

The voltage in a circuit can be determined from the current, total resistance, and capacitance. The correct option is D.

The current is the stream of charges flowing from the positive terminal of the voltage source to the its negative terminal.

A simple circuit consists of a voltage source or battery and resistance, current will flow when connected. But, if circuit has capacitance and resistance, the current will flow from the circuit.

Thus, the voltage in a circuit can be determined from the current, total resistance, and capacitance. The correct option is D.

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Explanation:

1.

Initial speed of satellite is 30,000 m/s

Final speed of satellite is 15000 m/s

Time taken by the satellite to reach final speed is 60 s

The satellite’s acceleration is equal to the change in velocity divided by time taken. So,

[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{15000 -30000}{60}\\\\a=-250\ m/s^2[/tex]

2.

Initial speed of a boat is 42 m/s

Final speed of a boat is 88 m/s

Time taken is 4 s

The acceleration of boat during this period is :

[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{88-42}{4}\\\\a=11.5\ m/s^2[/tex]

Answer:

Surface material breaks down into smaller pieces

Explanation:

The event that occurs after erosion is that very dense particles settle faster than low-density particles.

The term erosion refers to the washing away of top soil. Erosion may be caused by;

In both cases, land is rendered unfit for agricultural purposes hence every method must be employed to avoid erosion.

The event that occurs after erosion is that very dense particles settle faster than low-density particles.

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Answer:

If the charged particles are moving, electrical energy is a type of kinetic energy

Explanation:

This is because the electrical energy converted to kinetic energy of the charges. If q is the magnitude of the charge and V the electric potential it passes through, if it has a mass, m, it will develop a speed, v due to kinetic energy given by

qV = 1/2mv²

v = √(2qV/m)

Angular speed after collision: approximately 0.285 rad/s. Linear momentum not conserved due to external force.

To find the angular speed of the bar just after the collision, we can use the principle of conservation of angular momentum.

Before the collision, the system (bar + ball) has zero angular momentum because both the bar and the ball are stationary relative to the pivot point.

After the collision, the angular momentum of the system is conserved. We can write:

[tex]\(I_1\omega_1 + mvr = I_2\omega_2\)[/tex]

where:

[tex]- \(I_1\) is the moment of inertia of the bar about the pivot point before the collision,[/tex]

[tex]- \(I_2\) is the moment of inertia of the bar about the pivot point after the collision,[/tex]

[tex]- \(\omega_1\) is the initial angular speed of the bar,[/tex]

[tex]- \(\omega_2\) is the final angular speed of the bar,[/tex]

[tex]- \(m\) is the mass of the ball,[/tex]

[tex]- \(v\) is the velocity of the ball, and[/tex]

[tex]- \(r\) is the distance from the pivot point to the point where the ball strikes the bar.[/tex]

Given that the bar is hanging vertically, its moment of inertia about the pivot point is [tex]\(I = \frac{1}{3}ml^2\), where \(m\) is the mass of the bar and \(l\)[/tex] is its length. Substituting the given values:

[tex]\(I_1 = \frac{1}{3}(90\, \text{N})(3\, \text{m})^2 = 270\, \text{kg m}^2\)[/tex]

The moment of inertia of the bar does not change after the collision because no external torque is applied. So [tex]\(I_1 = I_2\).[/tex]

The distance from the pivot point to the point where the ball strikes the bar is [tex]\(r = 1.6\, \text{m}\).[/tex]

Substituting the values into the conservation of angular momentum equation:

[tex]\(270\omega_1 + (4\, \text{kg})(12\, \text{m/s})(1.6\, \text{m}) = 270\omega_2\)[/tex]

Solving for [tex]\(\omega_2\):[/tex]

[tex]\(270\omega_1 + 76.8 = 270\omega_2\)[/tex]

Now, we need to find [tex]\(\omega_1\). Since the bar is initially at rest, \(\omega_1 = 0\).[/tex]

[tex]\(0 + 76.8 = 270\omega_2\)[/tex]

[tex]\(\omega_2 = \frac{76.8}{270} \, \text{rad/s} \approx 0.285\, \text{rad/s}\)[/tex]

So, the angular speed of the bar just after the collision is approximately [tex]\(0.285\, \text{rad/s}\).[/tex]

As for why linear momentum is not conserved, it's because an external force (the impact of the ball) is acting on the system. Linear momentum is only conserved in a system where there are no external forces acting on it. In this case, the collision between the ball and the bar introduces an external force, causing linear momentum not to be conserved.

The angular speed of the bar just after the collision is approximately 3.94 rad/s. Linear momentum is not conserved in this situation due to external forces acting on the system, such as gravity and the pivot support force. Angular momentum is conserved because these external forces don't exert torques around the pivot point.

To solve this problem, we need to consider the conservation of angular momentum. we first evaluate the change in angular momentum of the ball. Then, we find the moment of inertia (I') of the pivot. since the principle of conservation of angular momentum states that the change in angular momentum of the ball is equal to the angular momentum of the bar, we can use this to calculate the angular speed of the bar.

The ball strikes the bar at a point 1.6 m below the ceiling, so the distance from the pivot point is 1.6 m.

The initial angular momentum of the ball: L₁ = m₁ × v₁ × r = 4 kg × 12 m/s × 1.6 m = 76.8 kg·m²/s

The final angular momentum of the ball: L₂ = m₁ × v₂ × r = 4 kg × (-5 m/s) × 1.6 m = -32 kg·m²/s

Net change in angular momentum of the ball: ΔL = L₁ - L₂ = 76.8 kg·m²/s - (-32 kg·m²/s) = 108.8 kg·m²/s

The moment of inertia of the bar about the pivot is: I' = (1/3) × M × L² = (1/3) × (90 N / 9.8 m/s²) × (3 m)² ≅ 27.6 kg·m²

Using conservation of angular momentum:

ΔL = I' × ω' where ω' = angular speed of the bar

⇒ 108.8 kg·m²/s = 27.6 kg·m² × ω'

Therefore, the angular speed of the bar, ω' ≅ 3.94 rad/s

The reason why angular momentum is not conserved is because there are external forces (such as gravity and the pivot support force) acting on the system. These forces exert impulses during the collision, affecting the linear momentum but not the angular momentum.

Answer:

11340

Explanation:

Power = Work/time.

P = W/t ................ Equation 1

Make W the subject of the equation,

W = Pt.................. Equation 2

Given: P = 270 Watts, t = 42 seconds

Substitute these values into equation 2

W = 270(42)

W = 11340 J

Hence the work done  is 11340

Answer:11340 J

Explanation:

Answer:

mass=weight/gravitational acceleration

mass=1.059/10=105.9

Divide the change in velocity by the time interval

For the acceleration of an object, divide the change in velocity by the time interval.

To calculate an object's acceleration, divide the change in velocity by the time period. The right answer is: Divide the velocity change by the time period.

The rate at which an object's velocity varies over time is measured as acceleration. It is computed by dividing the velocity change by the time it takes for that change to occur. The acceleration formula is:

Acceleration = (Change in Velocity) / (Time Interval)

Thus, by determining the change in velocity (the difference between the final velocity and the initial velocity) and dividing it by the time interval, you can find the object's acceleration.

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Answer:

Radio waves

Explanation:

Radio waves have the lowest frequency and are the least harmful to humans and animals so they are used in tv remotes, cell phones and anything that transmits data.

Answer:

It's infrared waves

Explanation:

The final velocity of the car is 46 m/s

The final velocity of the car can be obtained as follow:

v = u + at

v = 0 + (4.6 × 10)

v = 0 + 46

v = 46 m/s

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Answer:

5m/s

Explanation:

From momentum conservation:

Momentum =mass × veloclty

Momentum before collision = momentum after collision

Given that mass of dart = 0.5kg, mass of apple = 1kg, velocity of dart = 1.5m/s, velocity of apple = 0m/s

(0.5×1.5)- (1×0) = ( 0.5+1)v

7.5-0 = 1.5v

7.5 = 1.5v

V = 7.5/1.5

V = 5m/s.

velocity of the dart and apple just after the dart is embedded is 5m/s

The problem is solved using the principle of conservation of momentum. The total momentum before the collision is equal to total momentum after, which allows us to calculate the velocity of apple and dart together after the collision as 5 m/s.

This problem involves the concept of conservation of linear momentum. In an isolated system where no external forces are acting (like this dart and apple situation), the total linear momentum before the collision is equal to the total linear momentum after the collision.

We are given that the dart (0.5kg) was moving at 15 m/s and the apple (1kg) was at rest, the initial total momentum before the collision would be the momentum of dart (since apple was at rest) = mass of dart x velocity of dart = (0.5kg)(15m/s)=7.5kg.m/s.

After the collision, both the dart and the apple move together with a new velocity v. The final total momentum is the sum of the momentum of apple and dart = total mass x velocity = (1kg + 0.5kg) x v .

Thus, our equation based on the principle of momentum conservation would be: (mass of dart x initial velocity) = (total mass x final velocity), or 7.5kg.m/s = 1.5 kg * v. Solving for the new velocity (v), we get v = 7.5kg.m/s / 1.5kg =5 m/s.

So, the velocity of the dart and the apple just after the dart is embedded would be 5 m/s.

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Answer:

Scientists are looking for a way to create cheap, safe, and sustainable energy.

Nuclear fusion is the process by which two atoms rapidly collide at each other forming a new nucleus. The energy of colliding and synthesizing has intrigued scientist into believing that this could be one of best sources of renewable energy.Explanation:

Answer:

d

Explanation:

e2020

Answer:

2, 8 and shell

Explanation:

Neon as atomic number 10. Since for each shell, electrons equal 2n².

When n = 1, 2n² = 2(1)² = 2

When n = 2, 2n² = 2(2)² = 8

So it fills both the first and second shell with 2 and 8 electrons respectively to achieve its stable atomic state. The rest of the 8 electrons go into the second shell because the first shell has achieved its stable dual configuration of two electrons. The next shell requires a maximum of 8 electrons to achieve stability so, the remaining electrons fill it up to achieve the stable octet configuration.

Final answer:

Refraction is the bending of light as it passes from one medium to another, and it is pronounced in a prism, where light is separated into its constituent colors through dispersion. Prisms utilize the law of refraction to create a spectrum of colors, as each color is refracted differently based on its wavelength.

Explanation:

Refraction occurs when light enters a new transparent medium and is bent either towards or away from the line perpendicular to the boundary surface. This bending is due to a change in the speed of light as it moves from one medium to another, such as from air into glass. When light passes through a prism, a triangular piece of glass with refracting surfaces, this effect is seen clearly.

The separation of light into different colors is termed dispersion, and it happens because not all colors are bent by the same amount. The deviation of each beam of light depends on its wavelength and the properties of the refracting material. In a prism, violet light is bent more than red light, resulting in the formation of a rainbow spectrum.

The law of refraction, or Snell's law, explains the change in direction of the light rays when they enter a medium with a different index of refraction. According to Huygens's principle, each point of a wavefront acts as a new source of wavelets, which spread out in the second medium at a slower speed, thus bending the wavefront. Prisms use this principle to not only divert but also break up light into its constituent colors, leading to the beautiful dispersion effect observed.

Answer:

The kinetic energy of the cell phone is 9J

Explanation:

The kinetic energy is the energy possessed by a body by virtue of motion.

The kinetic energy is expressed as

KE= 1/2m(v)²

Given data

Mass of cell phone m= 80g--to kg=80/1000= 0.08kg

Velocity of cell phone v= 15m/s

Substituting our given data we have

KE= 1/2*0.08(15)²

KE= (0.08*225)/2

KE=18/2

KE= 9J

The correct option is d) it decreases. A sound wave transfers energy through a medium by particle vibrations, creating compressions and rarefactions that propagate as longitudinal waves.

A sound wave transfers energy through the medium primarily by the vibrations of the particles in that medium. This propagation occurs as a longitudinal wave, which means the particle displacements are parallel to the direction of the wave's travel. The speed at which sound travels depends on the medium's rigidity (or compressibility in gases) and its density. Sound waves travel faster in more rigid or less dense materials and slower in less rigid or denser materials.

Key Points About Sound Waves:

Energy Transfer: Sound waves transfer energy through particle vibrations in the medium.

Question:

Which best describes the energy of a sound wave as it travels through a medium?

a. it remains the same

b. It increases.

c. It depends on the medium

d. it decreases.

The potential difference across the 45 Ω resistor is 4.5 V.

The potential difference across the 45 Ω resistor can be calculated using Ohm's Law, which states that V = I * R, where V is the potential difference, I is the current, and R is the resistance. In this case, the current is 0.10 A and the resistance is 45 Ω.

Plugging these values into the formula, we get V = 0.10 A * 45 Ω = 4.5 V.

Therefore, the potential difference across the 45 Ω resistor is 4.5 V.

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Answer:

Frequency is the reciprocal of the period. The period is 5 seconds, so the frequency is 1/(5 s) = 0.20 Hz.

Explanation: yes

Answer:it’s different materials have different abilities to transfer energy.

Explanation:

Just took it.

Answer:

its c

Explanation:

i got it right on edu

A radioactive element's sample must contain atoms with unstable nuclei, which undergo radioactive decay to achieve stability.

A sample of a radioactive element must contain atoms with unstable nuclei. Radioactive elements consist of isotopes whose nuclei have an imbalance in the number of protons and neutrons leading to an unstable configuration. This causes these nuclei to spontaneously emit particles or radiation in a process known as radioactive decay. During radioactive decay, an unstable isotope changes into a more stable isotope, often of a different element. Radioactive elements must contain atoms with unstable nuclei. These nuclei undergo radioactive decay, emitting particles to become a different nucleus. A nucleus with too few or too many neutrons will tend to undergo radioactive decay to achieve greater stability. Elements with atomic numbers above 92 are all synthetically produced and do not occur naturally on Earth—they are examples of artificial radioactivity.

Answer:

to mack boats float

Explanation:

without it the boats will sink to the bottom

-- Buoyancy is used to bring crude oil from Saudi Arabi to refineries in the US. The oil is loaded into tanks that are part of supertanker ships. Buoyancy is created by their ship-shape, so they float on water, and they can be dragged across the ocean on top of the water.

-- Buoyancy is used for a cheap thrill on the weekend.  People drive out in the country and find a place where they can buy a ride under a hot-air balloon.  The balloon is filled with hot air from a propane burner under its opening, and then it rises up off the ground because of its buoyancy in cool air.

-- Buoyancy is used cleverly by factories, to get rid of their gaseous and particulate wastes.  The wastes are heated, and then blown into tall "smokestacks" connected to the factory.  Then they rise because of the buoyancy created by hot stuff in cool air.  When they leave the top of the smokestack, they keep rising for a while.  Then, weather systems blow them away from the factory, over into other people's neighborhoods, where they finally sink to the ground in places where nobody knows where they came from.

-- Buoyancy is used in teapots, coffee makers, and lava lamps.  A heat source is placed under the bottom of the container. Heat is conducted through the bottom of the container, and it heats the fluid that's in contact with the inside of the container on the bottom. The hot fluid rises to the top of the container, because of the buoyancy created by hot stuff surrounded by cool stuff.  At the same time, cool stuff flows in to take its place at the bottom.  

In pots and pans and tanks where buoyancy is used this way, the motion of the fluids up and down and around is called "convection".

Answer: Both Technician A and B

Explanation:

There is a similar process in using a pressure transducer and lab scope to using a vacuum gauge.

And also, the pressure transducer can be used to tie any issues to individual cylinders if paired with a second trace consisting of the ignition pattern. Therefore, both Technician A and B are correct.

Answer:

Explanation:

a) Mechanical Advantage is defined as the ratio of the load to the effort applied to an object. Mechanical advantage occurs when we can use a minimal effort to overcome a much larger load.

Mathematically; Mechanical advantage = Load/ Effort

Load =  400 lb car engine

Effort applied = Tension generated by the hand crank in the rope = 100lb

Mechanical Advantage = 400lb/100lb

MA = 4

b) Assuming the efficiency is 100%

Efficiency = Workdone by the machine/Work put in the machine * 100%

Workdone by the machine = work output = Force * distance moved by load

= 400*3

= 1200lbft

Work put in the machine = Work input = Force * distance moved by effort

Work input = 100*d

substituting into the equation;

100% = 1200/100d * 100%

1 = 1200/100d

100d = 1200

d = 1200/100

d = 12ft

The length of the rope required to complete the work is 12ft

Answer:

THE ZEROETH LAW

Explanation:

IM JUST TO SMART FOR THIS SHIIIIIIIII

Answer:

ZEROTH

Explanation:

odyssey