an 80-kg man on ice skates pushes a 40-kg boy also on skates with a force of 100 n. the force exerted by the boy on the man is

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:

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

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 human perception of pitch primarily depends on frequency. " The correct answer is option: D.

Pitch refers to the subjective quality of sound that enables us to distinguish between high and low sounds. Frequency is physical property of sound that measures the number of cycles of vibration per second and is measured in hertz. The higher  frequency of a sound wave, the higher  pitch we perceive. This is because our ears are sensitive to different frequencies and can distinguish between them based on activity of the hair cells in  cochlea of the inner ear. While loudness, resonance, and intensity can also affect our perception of sound, they are not  primary factors that determine pitch. Hence correct answer is option: D.

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---The complete question is , The human perception of pitch primarily depends on __.

A. Loudness

B. resonance

C. intensity

D. frequency --

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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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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The process described in the question is known as scenario planning. It is a strategic planning method that involves generating multiple plausible scenarios of future conditions and analyzing the potential impact of each scenario on an organization or a system.

Scenario planning is a useful tool for decision-making, risk management, and identifying opportunities in an uncertain or rapidly changing environment.

By developing a range of scenarios, decision-makers can anticipate potential challenges and opportunities and develop strategies to respond effectively to each situation.

This approach allows organizations to be better prepared and more resilient in the face of future uncertainties. Scenario planning can be applied to various fields, including business, economics, environmental planning, and public policy.

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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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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 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 kinetic frictional coefficient remains relatively constant with changes in normal force, while the static frictional coefficient increased with increasing normal force.

It can be varied due to following reasons:

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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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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.

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

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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The direction of the current flow in a loop is determined by the change in the magnetic flux linking the loop. The direction of the current will be determined by Lenz's law.

When a magnet moves away from a loop, the current in the loop flows in the direction shown in (b).The direction of the current flow in a loop is determined by the change in the magnetic flux linking the loop. The direction of the current will be determined by Lenz's law. This law states that the direction of an induced current is such that it opposes the change that caused it. When a magnet is moved away from the loop, the magnetic flux linking the loop decreases. As a result, the loop's current will flow in such a way as to oppose the decrease in the magnetic flux.The direction of the current flow is shown by the right-hand grip rule. Wrap your right hand around the loop, with your fingers pointing in the direction of the magnetic field. Your thumb will point in the direction of the current flow in the loop. The magnetic flux through a loop is given by:$$ \Phi_{B} = BA cos \theta $$Where B is the magnetic field, A is the area of the loop and $\theta$ is the angle between the magnetic field and the normal to the loop. The induced EMF in the loop is given by Faraday’s law:$$\mathcal{E} = \frac{\Delta \Phi_{B}}{\Delta t}$$Where $\mathcal{E}$ is the induced EMF and $\Delta \Phi_{B}$ is the change in magnetic flux linking the loop. The induced current I in the loop is given by the Ohm’s law:$$I = \frac{\mathcal{E}}{R}$$Where R is the resistance of the loop. From the above equations, we can deduce that the direction of the current will depend on the direction of the change in magnetic flux linking the loop. If the magnetic flux increases, the induced current will oppose the increase, and if it decreases, the induced current will oppose the decrease. This is the Lenz’s law.

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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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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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Answer:

9800N

Explanation:

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

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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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 spring constant, k, is 0.00694 N/m or 6.94 kg/s2. the spring is compressed by 1.00 cm and the total stored potential energy is 0.00694 j.

To calculate the spring constant, k, if the spring is compressed by 1.00 cm and the total stored potential energy is 0.00694 J, you can use the following equation:

k = 2E/x2

Where E is the stored potential energy, and

x is the displacement of the spring.

So, plugging in the given values:

k = (2 × 0.00694) / (1.00 cm)2

  = 0.00694 N/m or 6.94 kg/s2

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Momentum and kinetic energy are both preserved in an elastic collision between two objects. These conservation rules allow us to find the ultimate velocity of m2 by solving for it.

The conservation of momentum can be used as a starting point:

M1V1I and M2V2I equal M1V1F and M2V2F.

where v1i and v2i are the two objects' beginning velocities, m1 and m2 are their respective masses, and v1f and v2f are their respective final velocities.

Inputting the values provided yields:

M1V1I and M2V2I equal M1V1F and M2V2F.

The formula is (6.0 kg)(+6.0 m/s) + (m2)(+4.0 m/s) = (6.0 kg)(+5.0 m/s) + (m2) (v2f)

(1/2)(m2)(+4.0 m/s) + (1/2)(6.0 kg)(+6.0 m/s)2

The formula is 2 = (1/2)(6.0 kg)(+5.0 m/s) + (1/2)(m2)(v2f)

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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

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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When walking from one speaker to the other on a line joining the two speakers, the sound is heard to alternate from loud to soft because of experiencing the effect of interference.

The phenomenon of interference is caused by the overlapping of two or more waves of the same frequency that combine to form a new wave. When the peaks of two waves coincide, constructive interference occurs, resulting in a stronger wave. When the crest of one wave coincides with the trough of another wave, destructive interference occurs, resulting in a weaker wave.

The sound waves emitted by two speakers with the same frequency, but slightly different phases, interfere with each other. Constructive interference occurs when the waves are in phase, resulting in a louder sound. Destructive interference occurs when the waves are out of phase, resulting in a weaker sound. When the listener moves from one speaker to the other, the phase difference between the sound waves changes, causing the sound to alternate between loud and soft.

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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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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 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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