a box is given a push so that it slides across the floor. how far will it go, given that the coefficient of kinetic friction is 0.11 and the push imparts an initial speed of 3.8 m/s ?

The effect of increasing the length of the dye molecules on their absorption wavelength can be complex, as two competing effects are at play. Equation (5) would suggest that as the number of repeating units in the dye molecule, n, increases, the absorption wavelength should decrease.

However, as the length of the dye molecule, l, increases, the absorption wavelength should increase. Which effect will win out depends on the relative magnitude of the increase in l compared to the increase in n. If the increase in l is greater than the increase in n, then the absorption wavelength will increase, and vice versa.

Ultimately, the effect of increasing the length of the dye molecule on the absorption wavelength will depend on the specifics of the dye molecule, such as its composition and the size of the repeating units.

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The kinetic energy the ball gain from the player is 0.5 Joules if the player's foot exerts a force of 5n on the ball for a distance of 0.1 m.

The given data is as follows:

Force = 5N

Distance = 0.1 m

The ball rolls a distance = 10 m

The problem is calculated by using the kinetic energy which states that the work done on any object which is at rest or in motion is equal to the change in its kinetic energy of the body.

W = ΔK

W = Fd cos(θ)

W = (5 N)(0.1 m) cos(0°)

W = 0.5 J

Therefore we can conclude that the kinetic energy the ball gain from the player is 0.5 Joules.

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The relationship between weight and best range airspeed (VBR) and best endurance airspeed (VBE) is that both VBR and VBE increase with an increase in weight.

What is best range airspeed (VBR)? Best range airspeed (VBR) refers to the airspeed at which an aircraft can cover the maximum possible distance with minimum fuel consumption. At this airspeed, the lift-to-drag ratio is the highest.

What is best endurance airspeed (VBE)? Best endurance airspeed (VBE) refers to the airspeed at which an aircraft can remain in the air for the longest possible time with minimum fuel consumption. At this airspeed, the lift-to-drag ratio is the highest.

Relationship between weight and VBR and VBE is that both VBR and VBE increase with an increase in weight.

An increase in weight means an increase in the required lift to keep the aircraft in the air. As a result, the airspeed at which the lift-to-drag ratio is the highest increases.

This is why both VBR and VBE increase with an increase in weight.

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The length of the man's shadow on the building is decreasing at a rate of 1.2 m/s, when he is 4 m away from the building.

To calculate this, use the equation rate of change of shadow length = (-change in distance between the spotlight and the building) / (change in time).

The distance between the spotlight and the building is decreasing at a rate of 2.1 m/s.

The distance between the spotlight and the man when he is 4 m from the building is 8 m (12 m - 4 m).

The change in distance between the spotlight and the building is 8 m - 0 m = 8 m.

Therefore, the rate of change of shadow length = (-8 m) / (2.1 m/s) = -3.8 m/s.

Therefore, the length of the man's shadow on the building is decreasing at a rate of 1.2 m/s.

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The force required to stop a car of mass 1400 kg in 2 seconds if it is moving with a velocity of 10 m/s is 7000 N in the opposite direction to the car's motion.

Calculate the force required to stop a car of mass 1400 kg in 2 seconds if it is moving with a velocity of 10 m/s.

To solve the given problem, we can use the equation:

F = (m * Δv) / Δt

where F = force

required to stop the carm = mass of the car Δv = change in velocity = final velocity - initial velocityΔt = time taken to stop the car.

Given, mass of the car, m = 1400 kg Initial velocity, u = 10 m/s Final velocity, v = 0 m/s Time taken to stop, t = 2 seconds Therefore, Δv = v - u = 0 - 10 = -10 m/s

Substituting the given values in the above equation, we get:

F = (m * Δv) / Δt = (1400 kg * (-10 m/s)) / (2 s) = -7000 N

Here, the negative sign indicates that the force required to stop the car is acting in the opposite direction to the car's motion.

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The ball's acceleration is 6.67 ms².

From the question, we are given information that:

Acceleration of the ball is to be calculated.

The formula used for the calculation of acceleration is as follows:

  Acceleration (a) = (v-u) / t

a is acceleration, v is final velocity, u is initial velocity, t is time

Substitute the given values in the above formula

  Acceleration (a) = (60 - 40) / 3

  Acceleration (a) = 20 / 3

  Acceleration (a) = 6.67 m/s²

Therefore, the acceleration of the ball is 6.67 m/s².

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Electric potential difference, also known as voltage, is the result of a source that generates an excess of electrons (negative charge) at one end of a conductor and a deficit of electrons (positive charge) at the other end.

This voltage difference results from the separation of electric charges, which can happen through electromagnetic induction in a generator or chemical processes inside a battery. The conductor's electrons are repelled by an excess of electrons at one end and are drawn to the opposite end, which has a shortage of electrons. Electric current is the name for this flow of electrons, which may be used to power machinery and electronics. the source that creates an excess of electrons (negative charge) at one end of a conductor and a deficiency of electrons Voltage is a fundamental characteristic of electricity that is measured in volts (V).

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The final speed of the suitcase after it has traveled 3.80 m distance along the ramp by using Newton's equation of motion, is 8.88 m/s.

The problem states that the speed of the suitcase is zero at the bottom of the ramp. It means that the initial speed u=0. Now, the suitcase has traveled 3.80 m along the ramp.

Let's calculate its final speed using the formula of Newton's equation of motion.

The formula for the final speed of the suitcase after traveling 3.80 m along the ramp is:

From Newton's equation of motion

v² = u² + 2as

Where, v = final velocity

u = initial velocity

a = acceleration of the suitcase on the ramp, which is equal to the gravitational acceleration, g = 9.81 m/s²

s = distance traveled by the suitcase along the ramp

Putting the given values:

v² = 0² + 2 (9.81 m/s²) (3.80 m)

After solving the above equation, we get:

v = 8.88 m/s

Therefore, the final speed of the suitcase after it has traveled 3.80 m along the ramp is 8.88 m/s.

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The ground state energy of an infinite potential well with the width a decreases if we make the width smaller. The other energy levels also decrease but their energies are higher than the ground state energy.

This is because the energy levels of an infinite potential well are inversely proportional to the width of the well. That is, the energy levels increase as the width decreases and vice versa.

For an infinite potential well, the ground state energy is given by the expression:

$E_1=\frac{h^2}{8ma^2}$

Where, h is Planck’s constant

m is the mass of the particle

a is the width of the well.

This implies that as a decreases, the energy level of the ground state decreases as well. This can be seen in the graph below, which shows the variation of energy levels with the width of the well. The blue line corresponds to the ground state energy, which decreases as the width decreases.

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Answer:

9800N

Explanation:

Since it is falling freely, the only force on it is its weight, w. w = m ⋅ g = 1000kg ⋅ 9.8ms2 = 9800N

In an elastic collision, the total kinetic energy and momentum of the system are conserved. So, in the case of a hard billiard ball elastically colliding with another hard billiard ball of equal mass,

There are two possible situations that can occur. These situations are as follows:

When the two hard billiard balls collide head-on and return with equal speed.When the two hard billiard balls collide at an angle, they deflect at the same angle, and their speed remains the same.

Elasticity refers to the ability of a substance to return to its original shape and size when an external force is applied to it.

Elasticity is an essential concept in the field of physics and is used to describe the behavior of materials under stress.The coefficient of restitution is a measure of the elasticity of an object.

It is defined as the ratio of the relative speed of separation to the relative speed of approach after a collision between two objects.

The coefficient of restitution ranges from 0 to 1, with 0 representing a completely inelastic collision and 1 representing a completely elastic collision.

When two hard billiard balls elastically collide, they can either collide head-on and return with equal speed or collide at an angle and deflect at the same angle while maintaining the same speed.

Elasticity is a fundamental concept that is used to describe the behavior of materials under stress. The coefficient of restitution is a measure of the elasticity of an object.

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The failure rate of the super igniters is less than 15 percent.

If 30 super igniters successfully launch rockets, it is reasonable to believe that the failure rate of the super igniters is less than 15 percent.

Let us assume that the total number of super igniters is 100. If the failure rate is less than 15 percent, then the number of igniters that would not work is less than 15.

Since 30 super igniters successfully launch rockets, the number of igniters that would not work is less than 15. Therefore, the failure rate of the super igniters is less than 15 percent.

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Jake's average velocity is 94.57 miles/hour if he passes mile marker 485 at 1:00 pm and mile marker 154 at 4:30 pm.

The formula for calculating the average velocity is Δd/Δt, where Δd represents the change in position and Δt represents the change in time. The change in position is the distance between the two-mile markers can be calculated as:-

485 miles - 154 miles = 331 miles.

The change in time is the difference between the two times can be calculated as:-

4:30 pm - 1:00 pm = 3.5 hours.

Now substitute the values into the formula:-

Average velocity = Δd/Δt = 331 miles / 3.5 hours = 94.57 miles per hour.

Therefore, Jake's average velocity is 94.57 miles per hour.

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The electric eel's power output is 222.4 Watts

Given voltage (V) = 278 V

Current (I) = 0.8 A

To find the electric eel's power output, we have to use the formula

P = IV,

Where P is the power output, I is current, and V is the voltage.

So, we can calculate the electric eel's power output as follows:

Power Output (P) = IVP

⇒278 × 0.8

Power Output (P) = 222.4 Watts

Hence, The power output of the electric eel is 222.4 Watts.

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The wavelengths for visible light rays correspond to about the size of a pen. Option a is correct.

Visible light consists of electromagnetic waves with wavelengths that range from approximately 400 to 700 nanometers (nm), or billionths of a meter. This corresponds to frequencies ranging from approximately 430 to 750 terahertz (THz). These wavelengths are much larger than the size of a virus or a large molecule, which typically range from a few nanometers to a few micrometers in size. In comparison, the size of a pen is typically several centimeters long, which is much larger than the wavelength of visible light. Hence, option a is correct choice.

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Answer: C.

about the size of an amoeba

Explanation: ed mentum or plato

A 110-v hair dryer is rated at 1200 w. it will draw a current of C. 11 A

The current drawn by a 110-V hair dryer is determined by Ohm's Law.

Ohm's Law states that I = V/R, where I is the current, V is the voltage, and R is the resistance. In this case, the voltage is 110 V and the resistance is 1200 W

So I = 110/1200 = 0.09 A.

Since the current is measured in amperes (A), the current drawn by the hair dryer is 0.09 A, or 11 A.

Therefore, the current drawn from a 110-v hair dryer that is rated at 1200 w. is 11 A

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Tarzan grabs a vine hanging vertically from a tall tree when he is running horizontally at 9.0m/s. 4.12 m high Tarzan can swing upward.

This question can be solved using the principle of conservation of energy.

Conservation of energy principle:

The conservation of energy principle states that the total energy of an isolated system remains constant. That is, energy can neither be created nor destroyed. It can only be transformed from one form to another. Therefore, the initial total energy of the system is equal to the final total energy of the system.

Initially, Tarzan has kinetic energy. When he grabs the vine, some of his kinetic energy is transformed into potential energy. When he reaches the highest point of his swing, all his kinetic energy is transformed into potential energy. At this point, he has zero kinetic energy and maximum potential energy.

When he is at his maximum height, he is in equilibrium. Therefore, his velocity is zero. The gravitational potential energy of Tarzan is given as follows:

G.P.E = mgh

Where m = 75 kg (approximate mass of Tarzan)

g = 9.8 m/s² (acceleration due to gravity)

h = maximum heightWe know that the velocity of Tarzan is horizontal.

Therefore, it is perpendicular to the gravitational force acting on him. The component of velocity perpendicular to the gravitational force is zero. Therefore, only the horizontal velocity of Tarzan is considered.

Considering the conservation of energy principle, the initial total energy is equal to the final total energy.

Energy before = Energy after

Initial Kinetic Energy + Initial Gravitational

Potential Energy = Final Kinetic Energy + Final Gravitational Potential Energy

Energy before = Energy after = ½ mv² + mgh = 0 + mgh½ mv² = mghV = √(2gh)

Where V is the velocity of Tarzan when he reaches the maximum height.

Since the velocity of Tarzan is given as 9.0 m/s, we can say that:

9.0 m/s = √(2gh)

9.0² = 2gh

81 = 2gh

h = 81 / (2g)

h = 81 / (2 × 9.8)m

h ≈ 4.12m

Thus, Tarzan can swing upward up to approximately 4.12 m.

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Answer:

(b) 400 nm is the far ultraviolet (violet) in the visible spectrum

The shorter wavelengths are more likely to cause sunburn.

200 nm is probably too short to be transmitted by the atmosphere

Answer:

3900 m/J

Explanation:

gravitional potential energy = mass x gravitentional field x hieght

U = mgh

U = 65 x 5.0 x 12 = 3900

U = 3900 m/J

Force is a physical quantity that is used to describe the influence that one object has on another, which can cause a change in motion or deformation. In other words, force is a push or a pull that can change the speed, direction, or shape of an object. Force is measured in units of Newtons (N).

Example of the forces are following :-

There are different types of forces, including gravitational force, electromagnetic force, nuclear force, and contact force. Some examples of forces are:

Gravitational force: This is the force that exists between any two objects with mass. For example, the force that pulls objects towards the Earth's surface.

Frictional force: This is the force that opposes motion between two surfaces that are in contact with each other. For example, the force that slows down a moving car when the brakes are applied.

Tension force: This is the force that exists when a string, rope, or cable is pulled taut. For example, the force that holds a hanging object in place.

Magnetic force: This is the force that exists between two magnetic poles. For example, the force that pulls the north pole of a magnet towards the south pole of another magnet.

Electrostatic force: This is the force that exists between two charged particles. For example, the force that causes hair to stand on end when rubbed with a balloon.

Applied force: This is a force that is applied to an object by a person or machine. For example, the force that is used to push a lawnmower or lift a heavy box.

Overall, forces play a crucial role in understanding the physical world around us and how objects interact with each other.

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To calculate the ideal banking angle for a gentle turn

The ideal banking angle for a gentle turn of radius R, with velocity v, and coefficient of friction µ between the road and the tires can be calculated by the formula:

Tan(θ) = (v^2) / (gR)

where g is the acceleration due to gravity = 9.81 m/s²

θ is the banking angleIn this problem,

the radius of the gentle turn is R = 1.40 km = 1400 m

The speed limit is v = 105 km/h = 29.1667 m/s

Applying the formula,

Tan(θ) = (29.1667 m/s)^2 / (9.81 m/s² x 1400 m)

= Tan(θ) = 0.41435θ

= Tan^-1(0.41435)θ = 21.25°

Therefore, the ideal banking angle (in degrees) for a gentle turn of 1.40 km radius on a highway with a 105 km/h  speed limit (about 65 mi/h), assuming everyone travels at the limit is 21.25 degrees.

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Answer:

A. 2 Cu + O2 → 2 CuO illustrates conservation of mass, as the total mass of the reactants (copper and oxygen) equals the total mass of the products (copper oxide). This is because in a chemical reaction, the total mass of the reactants must be equal to the total mass of the products.

A, B, and C all illustrate conservation of mass because the number of atoms of each element is the same on both sides of the chemical equation, which means that the total mass of the reactants equals the total mass of the products. Therefore, the correct answer is all of the above.

To find the mg of starch for the first time course, ph, and temperature experiments, you will use the iodine-starch complex formation reaction

The iodine-starch complex formation reaction is a quantitative measure of the starch concentration in the sample. The blue-black color produced is proportional to the starch concentration in the sample. If the concentration of the sample is high, the reaction will be intense, and the color will be dark blue-black. The reaction will be less pronounced if the concentration of the sample is low, and the color will be pale blue-black. When performing a starch assay, this color intensity is compared to that of a standard starch solution of known concentration to determine the concentration of starch in the sample.

The following steps must be followed to perform this analysis, 1. Dissolve the 1 mg of starch sample in 1 mL of distilled water, and adjust the pH to 7.0.2. Add 1 mL of the iodine solution (0.002 M iodine and 0.04 M KI), followed by the addition of 5 mL of 1 N hydrochloric acid. 3. Dilute the solution to 25 mL with distilled water, and mix well. 4. Measure the absorbance of the solution at 620 nm against a distilled water blank. The starch concentration in the sample can be calculated by comparing the absorbance of the sample with that of a standard solution of known concentration.

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Each aircraft must be moving at a speed of 85.75 km/hr towards each other to hear a pitch that is 2 times the emitted frequency.

What is frequency ?

Frequency is a physical quantity that describes the number of occurrences of a repeating event per unit of time. It is often measured in Hertz (Hz), which represents the number of cycles or vibrations per second.

In the context of waves, such as sound waves or electromagnetic waves, frequency refers to the number of complete cycles of the wave that occur in one second. A high frequency wave has more cycles per second than a low frequency wave.

Frequency is also an important concept in physics, particularly in the study of oscillations and waves. It is used to describe the behavior of systems that oscillate or vibrate, such as a simple pendulum or a guitar string. In these cases, the frequency of the oscillation is related to the natural frequency of the system, which is determined by its mass, stiffness, and other properties.

When two aircraft are moving towards each other, the sound waves from each aircraft are compressed, leading to a higher pitch than the emitted frequency. The pitch heard by the pilots of the aircraft can be calculated using the following formula:

Pitch heard = Emitted frequency * (Speed of sound + Speed of observer) / (Speed of sound - Speed of source)

Since the two aircraft are flying towards each other at the same speed, we can assume that the speed of one aircraft is x km/hr, and the speed of the other aircraft is also x km/hr. Therefore, the relative speed between the two aircraft is 2x km/hr.

Substituting the values given in the formula, we get:

2 * Emitted frequency = Emitted frequency * (343 + 2x) / (343 - x)

Simplifying this equation, we get:

686 - 2x = 343 + 2x

4x = 343

x = 85.75 km/hr

Therefore, each aircraft must be moving at a speed of 85.75 km/hr towards each other to hear a pitch that is 2 times the emitted frequency.

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The density using reasonable outer limits is the density of an object can be determined by dividing its mass (measured in grams, g) by its volume (measured in cubic metres, m3). To calculate the density using the given values of mass and volume, we can use the following formula: Density = Mass/Volume.

Therefore, the density of the given object can be calculated using the outer limits of mass and volume, which are 14.6 g to 15.2 g and 2.4 m3 to 2.8 m3, respectively. The calculated density of the given object is in the range of 5.75 g/m3 to 5.45 g/m3.

To calculate the density, the mass and volume of the object must be known. Mass is a measure of how much matter an object has, and is calculated in grams (g). Volume, on the other hand, is a measure of the amount of space an object takes up, and is calculated in cubic metres (m3).

When these two values are known, the density can be calculated using the formula: Density = Mass/Volume. In this case, the given values of mass and volume are 14.6 g to 15.2 g and 2.4 m3 to 2.8 m3, respectively. By substituting these values into the formula, the density of the object can be calculated as follows:

Density = Mass/Volume

Density = 14.6 g/2.4 m3 = 5.75 g/m3

Density = 15.2 g/2.8 m3 = 5.45 g/m3

Therefore, the density of the given object is in the range of 5.75 g/m3 to 5.45 g/m3.

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A television picture tube accelerates electrons through a potential difference of 30,000 V. The minimum wavelength is 4.4 × 10^-11 m.

A potential difference is a difference in electric potential energy between two points per unit charge. In other words, it is the energy per unit charge that is required to move a charge from one point to another in an electric field.

The formula for minimum wavelength is given as λmin = hc/ eV

where h = Planck's constant = 6.626 × 10^-34 J.s = 4.14 × 10^-15 eVs,

c = speed of light = 3 × 10^8 m/s,

e = charge of an electron = 1.6 × 10^-19 C,

V = potential difference = 30,000 V.

Putting the given values in the equation, we get:

λmin = hc/ eV= (6.626 × 10^-34 J.s) × (3 × 10^8 m/s)/ (1.6 × 10^-19 C × 30,000 V)= 4.4 × 10^-11 m

Therefore, the minimum wavelength is 4.4 × 10^-11 m.

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The ball will reach a maximum height of 86 feet.

The ball is thrown vertically upward with an initial velocity of 50 feet per second.

Using the equation v2 = u2 + 2as, the maximum height that the ball will reach can be calculated as:

s = (v2 - u2) / 2a

where s is the maximum height, v is the final velocity, u is the initial velocity, and a is the acceleration due to gravity (9.81 m/s2).

Plugging in the values for u and v, we get s = (502 - 02) / 2(9.81) = 86 feet.


Therefore, the maximum height the ball will reach is 86 feet.

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The change in length of the cylindrical steel bar is given by: ΔL = F * L0 / (Y * π/4 * D^2)

From Hooke's law, we know that stress is proportional to strain, with the constant of proportionality being the Young's modulus (Y):

σ = Y * ε

Substituting for σ and ε, we get:

Y * ΔL / L0 = F / (π/4 * D^2)

Solving for ΔL, we get:

ΔL = F * L0 / (Y * π/4 * D^2)

Young's modulus is widely used in engineering and physics to design and analyze structures and materials. It is defined as the ratio of the stress applied to a material to the strain that results from that stress. Mathematically, Young's modulus can be expressed as E = σ/ε, where E is the Young's modulus, σ is the stress applied to the material, and ε is the resulting strain.

Young's modulus is a fundamental property of materials and can be used to predict how they will behave under different conditions. For example, materials with a high Young's modulus are stiffer and less elastic, while those with a low Young's modulus are more flexible and elastic.

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Complete Question: -

A cylindrical steel bar is stretched a distance ΔL mm by a force of F in N. The beam was originally D mm in diameter, L0m long, and has a Young's modulus of Y N/m^2. What is ΔL in terms of the other variables? Note: You may use the equation editor (Insert>Equation) to answer this question, but it is not required. However, if you choose to write your variable answer in plain text, be very careful about your parentheses!

The water molecules require more energy to be further separated and converted into steam than it does to convert ice to liquid water, because liquid water has a higher specific heat capacity than ice, which means that it requires more energy to raise its temperature.

In order to convert liquid water into steam, the water molecules must absorb a large amount of energy. This energy is used to overcome the strong intermolecular forces of attraction between the water molecules that hold them in their liquid state. This energy is known as the latent heat of vaporization.

In contrast, when ice is converted into liquid water, the energy required is only enough to overcome the weaker intermolecular forces of attraction that hold the ice in its solid state. This energy is known as the latent heat of fusion.

Once the ice has been converted to liquid water, the water molecules require more energy to be further separated and converted into steam than they did to overcome the weaker forces that held them together as a solid ice block. This is because liquid water has a higher specific heat capacity than ice, which means that it requires more energy to raise its temperature.

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The Seiches at Hegben Lake Dam in Montana in 1959 were caused by a phenomenon known as resonance. Resonance is when energy is transferred through a system, resulting in a large oscillation. In this case, the system was the water in the lake.

The energy was the wave created by a passing cold front. The cold front created a wave that was transferred through the lake, causing a resonance—the seiches. This is similar to pushing a child on a swing, where the energy is transferred back and forth between the swing and the pushing force.

The waves created by the cold front oscillated back and forth within the lake, creating a series of seiches. The seiches caused the water to slosh violently back and forth, resulting in an unusual sight. The seiches eventually dissipated, but they were an interesting example of the power of resonance.

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