a man shoveling snow clears his front step using 200 joules in 100 seconds, how much power did he use

2 watts
20,000 watts
100 watts
300 watts​

If you decrease the atmospheric pressure around water at room temperature, it will result in a decrease in its boiling point. Here's an explanation of why this happens:

Relationship between Pressure and Boiling Point: The boiling point of a substance is the temperature at which its vapor pressure equals the atmospheric pressure.

At higher pressures, the vapor pressure required for boiling is also higher, resulting in a higher boiling point. Conversely, if you decrease the atmospheric pressure, the vapor pressure needed for boiling decreases, leading to a lower boiling point.

Effect of Decreased Pressure on Water: Normally, at standard atmospheric pressure (1 atm or 101.3 kPa), water boils at 100 degrees Celsius (212 degrees Fahrenheit).

However, if the atmospheric pressure is reduced, such as at higher altitudes or in a vacuum, the boiling point of water decreases. For example, at the top of a mountain with lower atmospheric pressure, water can boil at temperatures lower than 100 degrees Celsius.

Intermolecular Forces: The boiling point of water is primarily determined by intermolecular forces between water molecules. These forces, known as hydrogen bonding, are relatively strong and require a certain amount of energy to break for the liquid water to turn into vapor during boiling.

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Beginning velocity is required for a projectile to be launched from the ground up to the Washington Monument's 555-feet summit.

Casey was convinced to make the height of the tower 10 times the width of the base, which meant that the Washington Monument's ideal height was 555 feet rather than the 600 feet that Mills had originally envisioned.

When compared to a memorial, why is the Washington Monument a "monument"? A memorial honors or pays tribute to a person who has passed away. A monument has a crucial distinction: it is created to honor or remember a living person.

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Answer:

Amiodarone

Explanation:

A 1100 kg automobile moving at 27.0 m/s begins to slack down and stops entirely at 578 m. The car is subjected to an average braking force of 694 N.

The friction between the brakes and the wheel produces work when a force is applied to a vehicle's brakes. The vehicle's kinetic energy is decreased, which slows it down and raises the temperature of the brakes.

The friction between the brakes and the wheel produces work when a force is applied to a vehicle's brakes. Therefore, the amount of braking power required to stop a vehicle over a given distance increases as the speed of the vehicle increases.

t = Time taken

u = Initial velocity = 27 m/s

v = Final velocity

s = Displacement = 578 m

a = Acceleration

m = Mass

Equation of motion:

\(v^{2} - u^{2} = 2as\)

⇒\(a = \frac{v^{2} - u^{2} }{2s}\)

⇒\(a = -0.63062 m/s^{2}\)

Force, F = ma

F = 1100 x -0.63062

F= - 693. 6851 N

Magnitude of force = 694 N

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Answer:

a wedge.

Explanation:

it moves when you apply force to one end of the wedge.

An AC source feeding a load that consists of a resistance and reactance connected in series is called a series R-X circuit, where R represents the resistance and X represents the reactance.

A series R-X circuit is a type of electrical circuit where a resistance and a reactance are connected in series to an AC source. The resistance is represented by the symbol R, and the reactance is represented by the symbol X.

The reactance can be either capacitive or inductive. Capacitive reactance is represented by the symbol XC and is caused by the presence of a capacitor in the circuit. Inductive reactance is represented by the symbol XL and is caused by the presence of an inductor in the circuit.

The series R-X circuit is important in electrical engineering because it is commonly used in many applications, such as power transmission and distribution systems, electronic circuits, and motor control circuits.

The impedance of the series R-X circuit is the total opposition to the flow of current, and it is the sum of the resistance and the reactance.

The phase angle between the voltage and the current in a series R-X circuit depends on the ratio of the reactance to the resistance. If the reactance is greater than the resistance, the circuit is said to be "inductive" and the phase angle is positive.

If the resistance is greater than the reactance, the circuit is said to be "capacitive" and the phase angle is negative. If the reactance is equal to the resistance, the circuit is said to be "resistive" and the phase angle is zero.

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Answer:

4 km/h

Explanation:

160/5 = 32

140/5 = 28

32-28= 4

The difference in average speed between two cars, one that traveled 160 kilometers in 5 hours, and the other that traveled 140 kilometers in the same time would be 4 km/hr.

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.

As given in the problem we have to find out the difference in average speed between two cars, one that traveled 160 kilometers in 5 hours, and the other traveled 140 kilometers at the same time.

The average speed of the car that traveled 160 kilometers in 5 hour = 160 / 5 = 32 km / hr

The average speed of the car that traveled 140 kilometers in 5 hour = 140 / 5 = 28 km / hr

The difference in the average speed = 32 -28

                                                              = 4 km / hr

Thus  , the difference in the average speed of the car would be  4 km / hr .

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Answer:

imma have to come back to you on that one

Answer:

The Sun is at the center of the solar system and the planets move around it.

Explanation:pluto/edmentum

Answer:

12.5 m/s

Explanation:

Given that,

The initial horizontal and vertical components are 12.50 m/s and 21.70 m/s, respectively.

We need to find the horizontal velocity of the ball at position C.

It is a case of projectile motion. We know that in case of projectile motion, the horizontal velocity of the projectile remains the same while vertical velocity varies. It can be very clear that the horizontal velocity at C is 12.5 m/s.

The mechanical energy at top =Mechanical energy at bottom

\(\\ \tt\longmapsto M_{initial}=M_{Final}\)

\(\\ \tt\longmapsto KE=M_{initial}\)

\(\\ \tt\longmapsto KE=P.E_{(Top)}+K.E_{(Top)}\)

\(\\ \tt\longmapsto K.E=mgh+\dfrac{1}{2}mv^2\)

\(\\ \tt\longmapsto K.E=m\left(gh+\dfrac{v^2}{2}\right)\)

\(\\ \tt\longmapsto K.E=54\left((10)(51)+\dfrac{2.6^2}{2}\right)\)

\(\\ \tt\longmapsto K.E=54\left(510+\dfrac{6.76}{2}\right)\)

\(\\ \tt\longmapsto K .E=54(510+3.38)\)

\(\\ \tt\longmapsto K.E=54(513.38)\)

\(\\ \tt\longmapsto K.E=27722.52J\)

\(\\ \tt\longmapsto K.E=27.7KJ\)

To determine the diameter of the cylindrical rod that can withstand a load of 650 N, we need to consider the yield strength of the material and the applied load. the diameter of the rod is approximately 11.62 mm.

By using the formula for stress (force divided by area) and rearranging it to solve for the diameter, we can find the required diameter of the rod.

The stress experienced by the rod can be calculated using the formula:

Stress = Force / Area

Given that the yield strength of the steel is 310 MPa, we can set up the equation:

310 MPa = 650 N / (π * (diameter/2)^2)

We can rearrange the equation to solve for the diameter:

diameter = √(650 N / (310 MPa * π)) * 2

Substituting the given values, we find:

diameter ≈ √(650 / (310 * 10^6 * π)) * 2 ≈ 11.62 mm

Therefore, the required diameter of the rod to withstand the load is approximately 11.62 mm.

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The surface temperature of an object is directly related to the electromagnetic radiation (EMR) it emits. As the temperature of an object increases, the intensity and distribution of the emitted EMR also increase.

According to Planck's law of black-body radiation, the intensity and distribution of electromagnetic radiation emitted by an object depend on its temperature. This relationship is described by the Stefan-Boltzmann law and the Wien's displacement law.

The Stefan-Boltzmann law states that the total power radiated by a black body (or an object that closely approximates a black body) is proportional to the fourth power of its absolute temperature (in Kelvin). Mathematically, it can be expressed as:

P = εσT^4

where P is the power radiated, ε is the emissivity of the object (a measure of how efficiently it radiates energy), σ is the Stefan-Boltzmann constant, and T is the temperature in Kelvin.

This means that as the temperature of an object increases, the power and intensity of the emitted radiation also increase significantly.

Wien's displacement law, on the other hand, describes the relationship between the temperature of an object and the wavelength at which its radiation is most intense. It states that the wavelength of maximum intensity (λmax) is inversely proportional to the temperature. Mathematically, it can be expressed as:

λmax = b / T

where λmax is the wavelength at maximum intensity, b is Wien's displacement constant, and T is the temperature in Kelvin.

As the temperature of an object increases, the peak wavelength of its emitted radiation shifts to shorter wavelengths (i.e., higher energy photons). For example, an object at room temperature emits primarily in the infrared range, while an object at higher temperatures, such as a red-hot metal, emits visible light.

The surface temperature of an object directly affects the electromagnetic radiation it emits. Higher temperatures result in increased intensity and a shift towards shorter wavelengths in the emitted radiation spectrum. This relationship is governed by the Stefan-Boltzmann law and Wien's displacement law. Understanding this relationship is crucial in various fields, including astrophysics, materials science, and thermal engineering.

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Bohr's equation enables us to determine the ionization energy, energy differences between energy levels, and the wavelengths associated with the atomic line spectrum for hydrogen atoms.

Bohr's equation for calculating the energy levels of a hydrogen atom provides valuable information about the atom's behavior. Using this equation, we can determine the following:

1. The energy needed to remove an electron completely from the hydrogen atom: Bohr's equation helps calculate the ionization energy, which is the amount of energy required to detach an electron from its lowest energy level (n=1) to infinity.

2. The difference in energy between two energy levels in a hydrogen atom: The equation calculates the energy levels for different orbits (n values), and by finding the difference between the energy levels, we can determine the energy gap between them.

3. The wavelength of a line in the atomic line spectrum for hydrogen: When an electron transitions between energy levels, it either absorbs or emits a photon. The energy of the photon corresponds to the difference in energy between the two levels. Using this information and the Rydberg formula, we can calculate the wavelength of the emitted or absorbed light, which corresponds to a line in the atomic line spectrum for hydrogen.

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Answer:

115.7g

Explanation:

Given parameters:

    Volume of copper  = 100cm³

    Mass of copper  = 890g

Unknown:

Mass of 13cm³ copper  = ?

Solution:

We know that the two materials are both made up of copper. Since we know the mass and volume of the first one, let us solve for the density. Using the density of the first one, we can determine the mass of the second one by the given volume.

Density is an intrinsic property of matter. It has the same value for every given substance.

It is expressed as mass per volume of  a substance;

    Density  = \(\frac{mass}{volume}\)

Input the parameters and solve;

  Density  = \(\frac{890}{100}\)  = 8.9g/cm³

Now to find the mass of the 13cm³ copper;

       Mass  = density x volume

       Mass  = 8.9 x 13  = 115.7g

Answer:

v?

Explanation:

v = ∆s / ∆t

v =?

∆s = 236 - 218 = 18km

=t = 10: 30 - 10:15 = 15 minutes to hour 15/60 = 0.25h

v = 18 / 0.25

v = 72km / h

speed of 72km / h

Answer: 5/17 seconds or roughly .3 seconds

Explanation:

We will hear our echo once it has traversed the canyon to reach the end, bounce off, then return back to our ears.

To find how long it travels in one direction:

\(\frac{50m}{340 \frac{m}{s}} = \frac{5}{34} s\) (or about .14 seconds)

For it to return back to us we double that time.

The time for it to reach our ears would be 5/17 seconds or roughly .3 seconds.

The electric potential at the point indicated by the dot can be found by summing the contributions from each half of the rod.

To determine the electric potential at the indicated point, we can use the principle of superposition. We'll calculate the potential due to each half of the rod separately and then add them together.

Let's assume the length of the rod is L and the distance of the point from the center of the rod is r. The electric potential at a point on the rod due to a charged element can be given by V = k(Q/L) * (1/r), where k is the Coulomb's constant.

For each half of the rod, the potential contribution will be V1 = k(Q/2L) * (1/r) and V2 = k(Q/2L) * (1/r). Adding these two potentials, we get the total potential at the indicated point as V = V1 + V2 = k(Q/L) * (1/r).

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The correct option is B. P space equals space I space V  also be written as P = (V/R)^2.

The correct expressions for the power of an electrical circuit are:

P = I^2 * R

P = V^2 / R

So, the correct options are:

P = I^2 * R

P = V^2 / R

An electrical circuit is a network of interconnected components that are designed to transport electrical current. These components can include resistors, capacitors, inductors, switches, and power sources such as batteries or generators.

The current flow in a circuit is governed by the laws of physics, including Ohm's Law which relates the voltage, current, and resistance of a circuit. Electrical circuits can be either open, meaning that the current flow is interrupted, or closed, meaning that the current flows continuously through the circuit.

The study of electrical circuits is an important part of physics as it provides a foundation for understanding a wide range of phenomena, from the functioning of electronic devices to the behavior of lightning in the atmosphere.

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Complete Question:

Which of these is a correct expression for the power of an electrical circuit? Select all of them that are right.

A). P space equals space I squared R

B). P space equals space I space V

C). P equals V to the power of 2 space end exponent R space

D). P space equals space V squared divided by R

The instrument which is used to control current in an electric circuit is rheostat.

Hope this helps :)

Answer:

or bhai kya haal h

hum bhi india se hi h

Answer: Elevators use pulleys to function.

A cargo lift system that allows for items to be hoisted to higher floors is a pulley system.

Explanation:

Answer:

Okay, based on the provided options and information about heat and work affecting molecular motion, the choice that would cause the greatest decrease in molecular motion is:

B. The system absorbs 100 J of heat and has 100 J of work done to

it.

Here is the reasoning for why this would cause the largest decrease in molecular motion:

   Heat absorption reduces molecular motion. When a system absorbs heat, the energy is used to reduce the total heat energy and speed of molecules in the system. This decreases their motion and random kinetic energy.

   Doing work on a system also reduces molecular motion. When external work is done on a system, it requires energy that comes from the molecular motion and heat within the system. This decreases the available energy and speed of molecules, slowing their motion.

   A combined effect would further decrease motion. Absorbing heat reduces motion, and doing work on a system also reduces motion. An interaction where the system both absorbs heat and has work done to it would have a combined, even greater effect on decreasing molecular motion.

In contrast, the other options would either increase, decrease, or have an unknown effect on molecular motion:

A. Releasing heat and doing work could either increase or decrease motion, depending on the relative amounts. The net effect is unknown.

C. Releasing heat would increase molecular motion while doing work decreases it. The combined impact depends on the relative amounts.

D. Releasing heat increases molecular motion while doing work on the system decreases it. The overall effect depends on the relative contributions.

Therefore, option B is the choice that definitively specifies the conditions that would have the greatest decreasing impact on molecular motion in the system.

Let me know if this explanation makes sense or if you have any other questions! I can also provide different examples or re-explain anything that would be helpful.

Please select choice B as the situation that would cause the greatest decrease in molecular motion.

Let me know if you have any other questions!

Explanation:

The wire is supporting the tree at a height of approximately 1.32 m above the ground.

The support wire is attached to the tree 1.50 m from the ground, and the wire itself is 2.00 m long. To ensure the tree stays vertical, the wire is providing support.
To understand how the wire supports the tree, we can visualize a right triangle formed by the wire, the ground, and the tree. The wire acts as the hypotenuse of this triangle, with one leg being the distance from the ground to the attachment point (1.50 m) and the other leg being the vertical height of the tree above the attachment point.
Using the Pythagorean theorem, we can find the vertical height of the tree. The equation is a^2 + b^2 = c^2, where a is the height of the tree, b is the distance from the ground to the attachment point, and c is the length of the wire.
In this case, a^2 + 1.50^2 = 2.00^2. Solving for a, we have a^2 + 2.25 = 4.00. Subtracting 2.25 from both sides, we get a^2 = 1.75. Taking the square root of both sides, we find a ≈ 1.32 m.
Therefore, the wire is supporting the tree at a height of approximately 1.32 m above the ground.

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Answer:

9000 J

Explanation:

Answer:

37.5 kg⋅m/s

Explanation:

p = mv

p = (1.5)(25) = 37.5 kg⋅m/s

Momentum is conserved in all collisions and explosions!

Answer:

I hope my answer is good!

Kinetic energy: The increase in weight of the people would result in an increase in the kinetic energy of the roller coaster. As the roller coaster moves through the track, it gains kinetic energy as it goes downhill, and this energy would be greater if the people were heavier.

Potential energy: The increase in weight of the people would result in an increase in the potential energy of the roller coaster. As the roller coaster climbs uphill, it gains potential energy, and this energy would be greater if the people were heavier.

Friction: The increase in weight of the people would result in an increase in the friction between the roller coaster and the track. More weight would create more wear and tear on the track and would make the roller coaster ride less smooth.

Answer:

0.4 m/s2

Explanation:

mass: 25kg

net force: 10 N

acceleration: ?

net force ÷ by mass= acceleration

10 N ÷ 25 Kg = 0.4 m/s2

Answer:

its very important in science because without atoms the universe would have not been created and our sun and our own planets

The nuclear reactions generally occurs in the deep part of the earth called the core. It is the fusion reaction which produce huge amount of energy to the universe. So the nuclear reactions important to the universe.

The process in which two lighter nuclei fuse together to form a heavier nucleus with the simultaneous release of a huge amount of energy is defined as the nuclear fusion. Some mass is always lost which is converted into energy in accordance with Einstein's equation.

It is the fusion reactions which are common in the interior of stars. The energy of our sun is believed to arise from a number of complex fusion steps. The sun is the ultimate source of energy in the universe which is due to the fusion reaction.

The nuclear reactions are responsible for the nucleosynthesis which means the formation of the elements in the universe.

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Eyes of circular aperture of diameter 4.8 mm. The light of wavelength 536 nm used to view the two point sources that are 140 m. The far apart must be the two point of source, if they are to just resolved by the eyes is  1.8 × 10⁻⁵ cm  cm.

The wavelength =  536 nm

The diameter = 4.8 mm

The angle under which the two point source ca be identified as the separated :

Ф = 1.22 (  λ / d)

Where

The  λ = wavelength

d = diameter

Ф = 1.22 ( 536  × 10⁻⁹ m/ 4.8 × 10⁻³ m)

   = 1.3 × 10⁻⁴

Now, Ф = sin Ф = tan

The distance between the two points is :

d = 1.3 × 10⁻⁴× 140 × 10⁻³  cm

  = 1.8 × 10⁻⁵ cm

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