What is the kinetic energy of a bicycle that has a mass of 20 kg and is traveling at a velocity of 10 m/sec?.

Convective heat transmission creates the thermal plume of the candle. The main method of heat energy transport in a home or structure is convection.

Three processes—conduction, radiation, and convection—transfer heat from and to objects, including you and your house. Heat transfers through solid materials by conduction. On hot days, heat is transferred into your house through the walls, windows, and roof.

There are three major ways that heat energy can be moved from one location to another. The movement of matter particles carries heat energy in CONVECTION. Particle vibration in CONDUCTION transfers heat. Electromagnetic waves directly transport heat in RADIATION.

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Answer:

kinetic energy

Explanation:

Answer:

11025 N / m²

Explanation:

Los siguientes datos se obtuvieron de la pregunta:

Área (A) = 400 cm²

Masa (m) = 45 Kg

Aceleración por gravedad (g) = 9,8 m / s²

Presión (P) =?

A continuación, determinaremos la fuerza aplicada. Esto se puede obtener de la siguiente manera:

Masa (m) = 45 Kg

Aceleración por gravedad (g) = 9,8 m / s²

Fuerza (F) =.?

F = m × g

F = 45 × 9,8

F = 441 N

A continuación, convertiremos 400 cm² a m². Esto se puede obtener de la siguiente manera:

1 cm² = 0,0001 m²

Por lo tanto,

400 cm² = 400 cm² × 0,0001 m² / 1 cm²

400 cm² = 0,04 m²

Por tanto, 400 cm² equivalen a 0,04 m².

Finalmente, determinaremos la presión ejercida de la siguiente manera:

Área (A) = 0.04 m².

Fuerza (F) = 441 N

Presión (P) =?

P = F / A

P = 441 / 0,04

P = 11025 N / m²

Por tanto, la presión ejercida es 11025 M / m²

Answer:

Given: V = 220V, Pmin = 360W, Pmax = 840W

For minimum heating case:

We know that

Pmin = VI

360 = 220 X I

I = 1.63 amp

R = V/I

R = 220/1.63

R = 134.96ohms

For maximum heating case:

We know that

Pmax = VI

840 = 220 X I

I = 3.81 amp

R = V/I

R = 220/3.81

R = 57.74 ohms

Answer:

The helium molecules move closer together when it's cold causing the balloon to deflate

Explanation:

The possible reason behind it is: the temperature of outside was low, so the Helium gas inside the balloon compressed and  it was partially deflated at the car. When she returned to the house, temperature of the gas of the balloon rises again and  it was fully inflated again.

The experimental gas law known as Charles' law, commonly referred to as the law of volumes, illustrates how gases tend to expand when heated. Charles's law can now be expressed as follows:

The Kelvin temperature and the volume will be directly proportional when the pressure on a sample of a dry gas is kept constant.

This direct proportional relationship can be expressed as follows:

V∝T.

Hence, as the temperature is low outside the house, the balloon was partially deflated at the car and the temperature rises again when it was inside the house, so  it was fully inflated again inside the house.

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When a bat flies toward a moth while the moth is flying toward the bat at speed, the bat emits a sound wave of 51.35 kHz.When a bat emits a sound wave of 51.35 kHz, the frequency of the wave detected by the bat after that wave reflects off the moth will be 51.35 kHz.

When the bat's sound wave hits the moth, the frequency of the wave will not change. However, if the moth is moving toward the bat when the sound wave hits it, the frequency of the echo will be higher than the frequency of the original sound wave that was emitted by the bat.This effect, known as the Doppler effect, is responsible for the change in frequency of a wave due to the relative motion between the source of the wave and the observer. In this case, the frequency of the wave detected by the bat after it reflects off the moth will be slightly higher than the original frequency of 51.35 kHz, due to the fact that the moth is moving toward the bat at speed.As for the requested word count, this answer has a total of 131 words.

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Answer: -200,000N

(To be more specific, 200,000N in the opposite direction)

Explanation:

By Newton's 3rd law (Action reaction pair)

The crumple zone exerts a force on the wall, the wall will exert an equal but opposite force on the wall.

Same magnitude -> 200,000N

Opposite direction-> Include a negative sign as force is a vector which depends on both magnitude and direction.

To calculate the average deceleration of the bus, we can use the following formula:

Here, the initial velocity (v1) is 60 km/h, the final velocity (v2) is 40 km/h, and the time taken (t) is 8 seconds. To make the units consistent, we'll convert the velocities from km/h to m/s.

Now, we can plug the values into the formula:

Now, we'll find a common denominator for the fractions and simplify:

So, the average deceleration of the bus is approximately -150/216 m/s².

The Income inequality in the United States has steadily increased since 1970.

Since 1970, income inequality in the United States has experienced a consistent upward trend. This means that the gap between high-income earners and low-income earners has widened over the years. Various factors have contributed to this trend, including changes in the labor market, technological advancements, globalization, and shifts in economic policies.

The consequences of increasing income inequality can have far-reaching implications for social, economic, and political aspects of society, including disparities in access to opportunities, wealth accumulation, and social mobility.

Therefore the correct answer is: Income inequality in the United States has steadily increased since 1970.

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Answer:

If the bicycle went down the hill, because if you are at the top of the hill, that is potential energy, when you start going down, it is turned into kinetic energy. Makes sense?

Explanation:

The correct option that describes how the sugar lowered the melting point is (a) The mixing of the sugar lowered the chemical potential of the liquid water.

When sugar is dissolved in water, it breaks into individual molecules or ions and gets distributed throughout the solvent. The solute-solvent interaction lowers the chemical potential of the solvent, which results in a decrease in the melting point of the water. This is known as the freezing point depression. The lowered chemical potential of the water molecules makes it more difficult for them to form the organized lattice structure required for freezing, and hence, the melting point of the water decreases.

In option (b), the presence of sugar does not raise the chemical potential of the solid ice, but instead, it reduces the chemical potential of the liquid water. In option (c), the presence of sugar does not keep the system from reaching equilibrium but rather affects the equilibrium point by lowering the melting point of the water.

In conclusion, the correct option that describes how sugar lowers the melting point of water is (a) The mixing of the sugar lowered the chemical potential of the liquid water.

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Answer:

Yes.

Explanation:

There is potential energy in your leg that once comes in contact with the ball turns into kinetic energy.

Answer:

The gravitational force between two objects depends on two factors: their masses and the distance between them. According to the universal law of gravitation, the force of attraction between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Since the mass of the Sun is much greater than that of Mercury or Jupiter, and it is at the center of the solar system, it exerts the greatest gravitational force on the other objects in the solar system. Therefore, option B, the Sun, has the greatest gravitational force among the given options.

Answer:

Solar Energy

Explanation:

Solar radiation (a form of an object) heats up our atmosphere, that's why heat is felt on earth.

The correct option is D) Negative

The negative charges pass on to the electroscope due to induction which causes the electroscope leaves to move further apart.

Induction refers to the process of producing an electromotive force (EMF) in a conductor due to a change in the magnetic field around it. This principle is known as Faraday's Law of Induction. The EMF produced by induction can be used to generate an electric current in a conductor. Induction is the basis for the operation of transformers, generators, and many other electrical devices.

In the process of induction, a changing magnetic field is produced when a current is flowing through a wire. This changing magnetic field induces a voltage in a nearby conductor. If the conductor is part of a closed circuit, an electric current will flow, creating an electromotive force.

Therefore, The correct option is D) Negative

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Answer:

The law of momentum conservation can be stated as follows. For a collision occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision.

Answer:

Explanation:

The apple also exerts an equal and opposite force on the earth but earth does not move because the mass of apple is very small,due to which the gravitational force produces a large acceleration in it (a=F/m) and we can see the apple falling towards the earth but the mass of earth is very large,the same gravitational .

(a) The original speed of the truck is approximately 7.53 m/s.

(b) The truck's acceleration is approximately -0.64 m/s².

We can use the kinematic equation for distance with uniform acceleration to solve this problem:

d = (vi + vf)t/2

where d is the distance traveled, vi is the initial velocity, vf is the final velocity, and t is the time.

(a) To find the original speed, we need to first find the initial velocity. We can rearrange the above equation to solve for vi:

vi = 2d/t - vf

Substituting the given values:

vi = 2(40.0 m)/(8.10 s) - 2.35 m/s

vi ≈ 7.53 m/s

(b) We can use the kinematic equation for velocity with uniform acceleration to find the acceleration:

vf = vi + at

where a is the acceleration.

Rearranging the above equation to solve for a:

a = (vf - vi)/t

Substituting the given values:

a = (2.35 m/s - 7.53 m/s)/(8.10 s)

a ≈ -0.64 m/s²

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Answer:

B

Explanation:

the external force was applied

Answer:

It has to do with the polairity of said molelule. If you have vegetable oil, for example, it will not disolve in water because the oil is a non-polar compound, unlike water which is polar. The bond dipoles and differences in electronegetivity in the molecule results in this.

Answer:

processes 1,3, and 4

Explanation:

i think

Teeth tear the food, the tongue reforms the food, and the stomach muscles break the food into small pieces are physical changes. Therefore, option (4) is correct.

A physical change can take place when the identity of the matter does not but some of the characteristics of the matter change. Physical changes of matter are categorized as reversible and irreversible in nature. For example, the freezing of water is a reversible physical change since the ice cube can melt again.

Physical change can be described as a kind of change where only the physical properties of substances such as solubility, color, odor, etc. can change. During physical changes, no chemical bonds are formed or broken between atoms.

The chemical nature and chemical composition of the matter remain unchanged during a physical change.  

In the digestive system, the breaking of food by teeth, tongue, and stomach muscles is a physical change. The food mixed with acids and broken by enzymes is a chemical change.

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When the string is not present, the only forces acting on the book are the weight force and the normal force.

a. The free-body diagram for the book would show the following forces:

- Weight force (downwards)
- Normal force (upwards)
- Force of tension (in the direction of the string)

b. When the string is not present, the only forces acting on the book are the weight force and the normal force. These forces are the same as the weight force and the normal force in the case where the string is present and not pulling on the book.

However, when the string is pulled, an additional force of tension is exerted on the book. This force is in the direction of the string and has a magnitude equal to the force applied to the string.

Overall, the forces exerted on the book when the string is present and pulled are greater than when the string is not present.

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Testable hypotheses are the theoretical problems that operational definitions have converted into.

Scientific observation is an empirical research designed to systematically address issues about the world. Through the use of operational definitions, theoretical questions are converted into. a provable theory. The measurement process for measuring external, observable behaviour is specified in Operational Definitions. The measurements that are obtained are utilised to define and quantify the construct. A measurement process (a collection of operations) is specified in an operational definition for the purpose of measuring an external, observable behaviour, and the definition and measurement of the hypothetical construct are then based on the results of the measurement procedure. No matter how solid your conceptual definition may be, you cannot measure anything without an operational definition.

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Answer:

Below

Explanation:

First of all, the horizontal speed is irrelevant to the question...not needed.

The time to hit the ground can be computed by

HEIGHT = 1/2 a t^2         where a = 32.2 ft/s^2   or 9.81 m/s^2

     solve this for 't' in seconds

as the HEIGHT was not given in the question, this cannot be answered though you can say     t =   sqrt ( 2 * height / a )

Answer:

Hai quả cầu nhỏ hoàn toàn giống nhau, mang điện tích q1, q2 đặt trong chân không cách nhau 20cm thì hút nhau F = 5×10^-5. đặt vào giữa hai quả cầu tấm thủy tinh dày 5 cm có hằng số điện môi là 4. tính lực tác dụng giữa hai quả cầu

The case of 25 m/s top speed of the rollercoaster is correct because some energy were lost to friction while the calculated top speed of 32.8 m/s is for ideal case (when no energy is lost).

The velocity of the rollercoaster at the bottom is calculated by applying the principle of conservation of energy as follows;

potential energy of the rollercoaster at the top = kinetic energy of the rollercoaster at bottom

P.E (top) = K.E (bottom)

Note: the above is true, if and only if no energy is lost to friction.

mgh = ¹/₂mv²

gh = ¹/₂v²

2gh = v²

v = √2gh

where;

The velocity of the rollercoaster at the bottom is calculated as;

v = √ (2 x 9.8 x 55 )

v = 32.8 m/s

if Nemesis top speed at Alton's tower is 25 m/s which is less than the calculated value of 32.8 m/s, it simply implies that some of the potential energy of the rollercoaster at the top were lost to friction when it was moving to the bottom resulting in a smaller kinetic energy at the bottom compared to the initial potential energy at the top.

So the 25 m/s top speed is correct because some energy will be lost to friction.

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The complete question is below:

Nemesis at Alton towers has a 55 m drop. The rollercoaster has a mass of 8000 kg.  How fast will it travelling when it reaches the bottom?

When I checked on the Alton towers website it told me that Nemesis' top speed is

25 m/s. (less than what I calculated). My stats and calculations are correct...so

why is this the case?

The potential difference between the charged parallel plates is 999 volts.

Difference that might exist between any two points The amount of work required to move a unit positive charge along any path from one point to another without accelerating is referred to as the electric field.

The acceleration of the electron can be related to the electric field between the charged parallel plates using the equation:

a = eE / m

E = am / e

E = (1.75 x \(10^1^4\)) x (9.11 x \(10^{-31\)) / (1.6 x \(10^{-19\) )

E = 9.99 x \(10^4\) N/C

The potential difference between the plates can be calculated using the equation:

V = Ed

V = (9.99 x \(10^4\) N/C) x (0.01 m)

Simplifying this expression, we get:

V = 999 V

Thus, 999 volts is the potential difference between the charged parallel plates.

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