which of these variable stars would be classified as a rr lyrae? which of these variable stars would be classified as a rr lyrae? an f giant with a period of 14 hours a pulsar with a period of 0.14 seconds a k giant with a period of 14 days an m giant with a period of 140 days a b supergiant with a period of 0.14 days

Answer:

d) blue light + yellow light

Explanation:

The color combination that will produce white light is blue light + yellow light. White light is the combination of all colors of the visible spectrum. When blue and yellow light are mixed together, they create a white light because blue and yellow are complementary colors. Complementary colors are pairs of colors that are opposite each other on the color wheel, and when they are mixed together, they create a neutral color (in this case, white). Therefore, the correct answer is d) blue light + yellow light.

The speed of the rocket is 3.6 * 10⁸ m/s.

The rocket's speed relative to spaceship is

Speed of spaceship = v(s) = 0.05c

Speed  of rocket = v(r) = 0.5c

We have to find the speed of rocket measured by friend in the space if the spaceship is fired away from the rocket.

We need to calculate the rocket's speed relative to Earth

Using formula of relative speed

v = v(s) - v(r) / 1 - {v(r) - v(s) / c²}

Put the value into the formula

v = 0.05 - 0.5 / 1 - { 0.5 - 0.05 / c²}

v = c * 1.2

v = 3.6 * 10⁸ m/s

Therefore, the speed of the rocket is 3.6 * 10⁸ m/s.

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Generally, a partial pressure of oxygen of 0.45 atm is considered toxic but the duration of the exposure is also important. Option A.

High air pressure pushes our bodies harder and limits how much our tissues can expand. Low atmospheric pressure, on the other hand, causes the tissues of the body to swell more, putting more pressure on nerves and other parts of the body.

During the rainy season, most surface waters are enriched with oxygen because rains saturate them with oxygen. As mentioned earlier, higher partial pressure of oxygen in the alveoli causes the pulmonary arterioles to dilate, thereby increasing blood flow.

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Velocity is zero, acceleration is non-zero is correct statement.

It is given that a ball is thrown upwards so a ball. So when ball is at maximum height, the condition will be that it's velocity will be zero.

So at maximum height velocity will become zero. No acceleration acting on it, acting on eight will be -G,

then G=-9.8 m/[tex]s^2[/tex]

So this extra acceleration due to gravity will always be same on the ball whether it is moving or it is at maximum height.

When the velocity will be zero only while our city is zero needed and the expiration is not equal to zero.

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The largest vertical force applied to the cord without causing motion is  

P ≤ 16.68 N.

From the free body diagrams shown in the attachment, we can write

∑ Fy = 0; -98.1 + Nab = 0

Nab = 98.1 N

-98.1 - 68.67 + Na = 0

Na = 166.77 N

∑ Fx = 0; P - Fab = 0,  P = Fab = Fa

Fab - Fa = 0

Fab = Fa

1st assumption: Block B slides alone

Fab = μab Nab = 0.3* 98.1 = 29.43 N

Fa = 29.43 is not less than μa Na = 0.1 * 166.7 = 16.68 N

Fa = 29.43 > μa Na = 16.68 N

P = 29.43 N

2nd assumption: Block A and B moves together

Fa = μa Na = 0.1 * 166.7 = 16.68 N

Fab = 16.68 < μab Nab = 29.43 N

P = 16.68 N

Thus, we can conclude that, P ≤ 16.68 N.

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Answer: To solve this problem, we can use the principle of conservation of energy. Energy is a property of an object or system that is related to its ability to do work, and can take many different forms. In the case of a skateboarder being launched off a ramp, the energy of the system is made up of two forms: kinetic energy and potential energy.

Kinetic energy is the energy of motion, and is equal to one half of an object's mass times its velocity squared. In this case, the skateboarder has a kinetic energy of 0.5 * 50 kg * (10 m/s)^2 = 2500 J when it is launched off the ramp.

Potential energy is the energy of position, and is equal to an object's mass times the acceleration due to gravity times its height. In this case, the skateboarder has a potential energy of 50 kg * 9.8 m/s^2 * h, where h is the height above the ramp.

Since energy is conserved, the sum of the kinetic and potential energy of the system must be constant. Therefore, at the peak of the skateboarder's motion, his kinetic energy must be 0, and all of the energy of the system must be in the form of potential energy. This means that the maximum height that the skateboarder can reach is equal to the kinetic energy of the system divided by the acceleration due to gravity times the mass.

For a skateboarder with a mass of 50 kg, the maximum height that he can reach is 2500 J / (9.8 m/s^2 * 50 kg) = 5.1 m. For a skateboarder with a mass of 100 kg, the maximum height that he can reach is also 5.1 m. This is because the maximum height that an object can reach is only dependent on its initial kinetic energy, not its mass. However, if the skateboarder is moving at a higher initial velocity, such as 20 m/s, then the maximum height that he can reach will be higher. In this case, the maximum height will be 0.5 * 50 kg * (

Explanation:

Tension in the back muscle for this scenario is 3095.4 N and the compressive reaction force is 3048 N, and the ratio is 5.53.

Two forces are acting on the compartment, Gravity acting downward, Tension T in cable acting upward.

Force is an influence which could change the movement of an object. A pressure can reason an object with mass to change its pace (e.g. moving from a kingdom of relaxation), i.e., to boost up. pressure can also be described intuitively as a push or a pull. A pressure has both importance and course, making it a vector quantity. it's far measured within the SI unit of newton (N). it's far a wellknown mechanical quantity. pressure is represented with the aid of the symbol F (previously P).

A) In equilibrium net torque about the hip = 0

   T*sintheta*x - Fgup*L/2 - Fgob*L = 0

   T*sin10*0.33 - 40*9.8*0.5/2 - 16.2*9.8*0.5 = 0

   Tension(T) = 3095.4 N

B) Fv = FRx = T*costheta

   Fv = 3095.4*cos10

     = 3048 N

C) Fv/(wub + wobj) = 3048/((40+16.2)*9.8) = 5.53

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The magnitude of the force that maintains circular motion while  acting on the puck is 14.7 N

F=ma

F=1.5 kg×9.8 m/s^2

F=14.7 N

When an object interacts with another object, it feels a push or a pull. Each object that two objects make contact with experiences a force. Once the encounter is over, the force between the two objects is gone. Forces are merely interactions; they do not exist independently. When two objects interact and appear to be in physical contact with one another, contact forces are generated. Several types of contact forces include frictional forces, tensional forces, normal forces, air resistance forces, and applied forces. Even when two interacting objects are far apart from one another, action-at-a-distance forces are still present.

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The string vibrates in three segments at a frequency of 660 Hz while exerting a force of 166.27 N. The first normal mode of a cello string vibrates at a frequency of 220 Hz.

The frequency of an event is its repetitions per unit of time. As a contrast to spatial frequency, it is also sometimes referred to as temporal frequency, and as a contrast to angular frequency, it is sometimes referred to as ordinary frequency. The hertz unit is used to measure frequency (Hz). f = 220Hz

L = 66cm = 0.6m for the wire's length

Wire mass = 1.8*10-3 kg, m/L = 1.8*10-3/0.66, and kg/m = 2.7*10-3

F = 4*2.7 *10^-3 *(0.6^2)*(220)^2 = 166.2N

The frequency at which n segments appear in a string is known:

fn = nf1

For, n = 3

f3 = 3f1

f3 = 3*220

f3 = 660Hz

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a) The efficiency of the engine is 67% b) The energy expelled to the cold reservoir in each cycle is  307.89 J

Qh=330 J , W= 22.0 J

a) n= W/Qh = 22 J/330 J = 0.06675 = 0.067

b) n= W/Qh = (Qh-QL)/Qh = 1 - QL/Qh

Plugging values,

0.067  =  1 - QL/330    => QL = 307.89 J

As a ratio of useful work completed to heat produced, an engine efficiency is determined. completed the task. The power delivered at the clutch or the driveshaft is referred to as the "work done" in this context. As a result, the work produced by thermodynamic expansion is reduced by losses such as friction and other losses. Today's gasoline engines are only about 30 to 35 percent efficient, meaning that about 65 cents of every dollar you spend on gas is wasted even with routine auto maintenance like a tune-up or an oil change. According to the Second rule of thermodynamics, it is impossible for heat engines to achieve 100% thermal efficiency.

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To determine the order of a chemical reaction, you can plot the concentration of one of the reactants or products versus time and monitor the slope of the line. The slope of the line will be proportional to the rate of the reaction, and the exponent of concentration term in the rate law will be the order of the reaction.

If you have two plots of the decomposition of Br₂ as a function of time, you can choose order of the reaction by comparing the slopes of the lines. If slopes of lines are the same, then the reaction is first order. If slopes of lines are proportional to the concentrations of Br₂ to the power of 2, then the reaction is second order. If slopes of lines are proportional to the concentrations of Br₂ to the power of 3, then the reaction is third order.

To calculate rate constant, you will require to employ the rate law for the reaction. The general form of rate law is: rate = k[A]^m[B]^n...

To determine the rate constant, you will require to estimate the concentrations of the reactants and the rate of the reaction at different times and utilize the rate law to solve for "k". The rate of the reaction can be calculated by estimating the change in concentration of a reactant or product over a particular time interval.

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If the disk is released from rest, Angular velocity (ω) of the disk is  [tex]245\frac{rad}{s}[/tex]

In physics, the angular velocity or rotational velocity (ω or Ω) is also known as the angular frequency vector, is the rate at which an object's angular position or orientation changes over time (i.e., the object's rotation speed is a pseudo-vector representation. or spin relative to a point or axis).

The magnitude of the pseudovector represents the angular velocity, i.e. the speed at which the object rotates or rotates, and its direction is perpendicular to the current plane of rotation or angular displacement. Angular velocity direction is conventionally given by the right-hand rule.

Calculation :

Given : M = 2kg, t = 3s, r = 80mm

solution :

[tex]0 + Mgrt = \frac{3}{2} Mr^{2}[/tex]ω

ω = [tex]\frac{2}{3} (\frac{g}{r} ) t[/tex]

ω =         [tex]245\frac{rad}{s}[/tex]

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A given net force propels an object along a straight-line path. If the mass were doubled, its acceleration would be half.

Force is mass times acceleration, or F = m * a. This means an object with a larger mass requires a stronger force to be moved along at the same acceleration as an object with a small mass. This is Newton's Second Law of Motion.

Newton's Second Law of Motion defines the relationship between force and acceleration. They are directly proportional. If you raise the force applied to an object, the acceleration of that object raises by the same factor. In short, force equals mass times acceleration.

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Newton's law of inertia best describes why a golf ball stays on the tee until the golf club hits it.

Newton's law of inertia states that an object at rest will remain at rest unless acted upon by an external force. In the case of a golf ball on a tee, the golf ball is not moving because there is no external force acting upon it. Therefore, the golf ball will remain on the tee until the golf club is used to hit it, applying an external force and causing the golf ball to move.

Newton's laws of motion are three physical laws that, together, laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces.

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Electromagnetic waves make up light. Electric fields can be in any direction perpendicular to the propagation of unpolarized light rays. At each point, the intensity is halved.

a). Light is an electromagnetic wave. It consists of minimally intense, pulsing electric and magnetic fields that are directed in all directions perpendicular to the propagation diffraction pattern. Electric fields of light from two slits add up to zero, therefore they likewise sum to zero in terms of light intensity.

b). In light waves (unpolarized), the electric field can be in any direction perpendicular to its propagation. Polarization entails facing the electric field in all directions except one toward zero. While polarisation, for example, in the vertical direction, additional electric field components from other directions are added to the necessary (remaining) direction.

c). Electric fields at angle θ to vertical adds Ecosθ to vertical field

before polarisation: same E in all directions

I∝E²

∝[tex]\int\limits^\pi _0[/tex]E² dθ =E² π

After polarisation;

I∝ [tex]\int\limits^\pi _0[/tex] (E cosθ )²dθ =E² π/2

Hence, Intensity is halved at every point

d). Electric field cannot be stopped by slits since it is not a mechanical thing that can be.

e). The horizontal and vertical electric field vector addition cannot be zero. Therefore, there won't be any places with 0 intensity.

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The thermal energy is created in the tires and road during this short trip is 30400 J.

Thermal energy is a type of energy that occurs when the temperature rises. Thermal energy is directly proportional to the temperature change of an object. Heat is a form of thermal energy. The hotter the substance, the greater its thermal energy. The increase in thermal energy caused by raising the temperature is due to the faster movement of atoms and molecules in matter.

Calculation :

Here,

distance ,d = 190 m

force exerting , F = 160 N

for the thermal energy created

thermal energy created in tires  = work done by the pushing force

thermal energy created in tires  = 190 * 160

thermal energy created in tires  = 30400 J

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A complex will appear to be the colours that is right opposite it on the colour wheel if it absorbs a specific colour. Colors are produced by the partially filled d orbitals of the stable ions Cr3+(aq), Fe3+(aq), and Co2+ (located to the left, centre, and right, respectively).

Because the [Cu(NH3)4]2+ ion absorbs the orange and red light, leaving the complementary colours of blue and green, it has a blue colour. Some of the light's wavelengths are absorbed by [Cu(NH3)4]SO4 solution when white light, such as common sunshine, travels through it. Red light in the spectrum is absorbed by the [Cu(NH3)4]2+ ions in solution. All the colours, with the exception of red, will be present in the light that exits the solution. This combination of wavelengths appears light blue to us (cyan). The diagram illustrates what happens when white light is sent through a [Cu(NH3)4]SO4 solution.

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Answer:

The North Atlantic Gyre, the South Atlantic Gyre, the North Pacific Gyre, the South Pacific Gyre, and the Indian Ocean Gyre.

Explanation:

The 5 major gyres are:

1. the North Atlantic Gyre

2. the South Atlantic Gyre

3. the North Pacific Gyre

4. the South Pacific Gyre

5. the Indian Ocean Gyre

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The statement that describes the results of the different weighing scales is as follows: Both accurate and precise (option C).

Accuracy is the exact conformity to truth, or to a rule or model i.e. degree of conformity of a measure to a true or standard value while precision is the ability of a measurement to be reproduced consistently.

Accuracy and precision are two measures of observational error. Accuracy is how close a given set of measurements are to their true value, while precision is how close the measurements are to each other.

According to this question, three different scales were used to weigh a bag of oranges. One scale says the bag weighs 2.1 lb, a second says it weighs 2.2 lb, and a third says it weighs 2.1 lb. The actual weight of the bag of oranges is 2.153 lb.

Based on the above observation, it can be said that the results are both accurate and precise because the measurements are both close to one another and to the true or standard value.

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In quantum mechanics, virtual particles are the hypothesized particles that combine to form quarks, graviton etc is a correct statement.

Quantum mechanics is the branch of science that examines the atomic and subatomic behavior of matter and light. It tries to explain and characterize the properties of molecules, atoms, and their constituent protons, neutrons, electrons, and other less well-known particles like quarks and gluons. These characteristics include electromagnetic radiation and how the particles interact with one another (i.e., light, X-rays, and gamma rays). It can be difficult to understand and accept the implications of the quantum theory because the behavior of matter and radiation at the atomic level frequently appears peculiar. Its theories frequently contradict intuitions derived from observations of the real world.

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The velocity of the center of mass of the system is the same as the velocity of the bullet, which is v. The total angular momentum of the system about the center of mass is  Lhoop + Lbullet. he kinetic energy of the system, before and after collision Khoop + Kbullet and Khoop_after + Kbullet_after respectively. The axis of rotation, which is the center of the hoop, will remain at rest after the collision.

The center of mass of the system is at point Q, which is a distance d from point O, where:d = (mP + mO)/(2*m).The velocity of the center of mass is the derivative of the position with respect to time. Since the bullet is moving with constant velocity, the position of its center of mass is also moving with constant velocity. The position of the center of mass of the hoop is not changing, so its velocity is zero. Therefore, the velocity of the center of mass of the system is the same as the velocity of the bullet, which is v.

The angular momentum of the bullet about the center of mass is:Lbullet = Ibulletw + md*v where Ibullet is the moment of inertia of the bullet about its center of mass, and d is the distance from the center of mass to the point of contact between the bullet and the hoop. The total angular momentum of the system about the center of mass is the sum of the angular momenta of the hoop and the bullet: Ltotal = Lhoop + Lbullet

Since angular momentum is conserved, this change in angular momentum must be due to the change in the angular momentum of the hoop. Therefore, we can set the change in angular momentum of the hoop equal to Ltotal and solve for the angular velocity w:

Ltotal = Lhoop + Lbullet

Ltotal = Ihoopw + mRv + Ibulletw + mdv

Ltotal = (Ihoop + Ibullet)w + (mR + md)v

w = Ltotal/(Ihoop + Ibullet) - (mR + md)*v/(Ihoop + Ibullet).

kinetic energy is conserved, this means that the change in kinetic energy of the hoop must be equal to the change in kinetic energy of the bullet. Therefore, we can set the change in kinetic energy of the hoop equal to the change in kinetic energy of the bullet and solve for the kinetic energy of the hoop after the collision:

Khoop_after - Khoop = Kbullet - Kbullet_after

Khoop_after = Khoop + Kbullet - Kbullet_after

The kinetic energy of the system after the collision is the sum of the kinetic energies of the hoop and the bullet after the collision:

Ktotal_after = Khoop_after + Kbullet_after

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The distance at which the center of gravity of hippo is located from the tail of hippo is equal to 1.58 m.

Center of gravity is referred to the point in any object at which the weight of the object is distributed evenly in all the directions. We need to find the position of Center of Gravity of the Hippo from the tail. We are given that Hippo carries 60% weight on its front feet that is

M(front) = 0.60 W

M(rear) = 0.40 W

Let d be the distance of center of gravity from tail and we write the equation as

0.60(1.8 + 0.5 - d) - 0.4(d - 0.5) = 0

=> 1.08 + 0.3 - 0.60d - 0.4d + 0.2 = 0

=> d = 1.58 m

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Complete Question:

A hippo's body is 4.0 m long with front and rear feet located as in (Figure 1). The hippo carries 60% of its weight on its front feet. How far from its tail is the hippo's center of gravity?

The velocity of the truck after the collision is 4.47 m/s.

We know that we can be able to use the principle of the conservation of momentum to be able to obtain the velocity of the truck. We know that from this principle, the momentum after collision would be the same as the momentum before collision.

Using this approach we can say that;

Momentum before collision = Momentum after collision

Then;

(3,242 *  11) + (1,413  * 0) = (3,242 * v) + ( 1,413 * 15)

35662 = 3242v + 21195

v = 35662  - 21195/3242

v = 4.47 m/s

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The velocity of the truck immediately after collision is 4.46m/s

?

Conservation of linear momentum states that in a closed system, if two bodies collides ,the momentum is always conserved. Or we can say conservation of linear momentum states that the momentum before collision is equal to the momentum after collision.

Momentum is expressed as : momentum = mass × velocity

The momentum before collision =

3242× 11 + 1413×0

= 35662+0 = 35662kgm/s

The momentum after collision

3242v + 1413× 15

= 3242v + 21195

from conservation of momentum

35662= 3242v+ 21195

3242v = 35662-21195

3242v = 14467

v = 14467/3242

v = 4.46m/s

therefore the velocity of the truck after collision is 4.46m/s

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The amount of damping force that allow shortest possible time is called​ critical damping of the system.

Critical damping is the threshold between overdamping and underdamping  at which the oscillator returns to the position of equilibrium quickly as possible.

Critical damping is frequently desired because such a system returns to and maintains equilibrium quickly. Furthermore, a constant force applied to a critically damped system moves the system to a new equilibrium position as quickly as possible without overshooting or oscillating around the new position.

Critical damping thus provides the rapid approach to zero amplitude for a damped oscillator.

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Answer:

A: at equilibrium

Explanation:

In simple harmonic motion (SHM), the maximum acceleration occurs at the points where the displacement of the object is zero, which is also known as the equilibrium position. Therefore, the correct answer is option A: at equilibrium.

Maximum acceleration is max at the amplitudes in simple harmonic motion. Velocity is maximum at equilibrium. Refer to the photo.

The mass of the robot on mars will be 39.4 Kg. The mass of an object is constant hence, the mass of the robot in earth also be 39.4 Kg. But it weight in earth changes to 386 N.

Gravitational force is the force by which an object attracts other objects into its centre of mass. Earth exerts a gravitational force to every objects on its surface and that's why everything stay on the ground and experience a weight.

The weight of a body in a gravitational field is the product of its mass and acceleration due to gravity g. The g value in mars is 3.8 m/s². The weight of the robot in mars is 150 N

mass of robot = 150 N/3.8 m/s² = 39.4 Kg.

Mass of an object is constant everywhere and the mass of robot in earth be 39.4 Kg.

The g value of earth is 9.8  m/s². Thus, weight of the robot in earth  = 34.9 × 9.8  m/s²  = 386 N.

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The distance from the top of the pendulum is 2.98 m.

Given,

         Mass of the pendulum rod,   M = 1.23 kg

         Length of the pendulum rod, L = 1.25 m

         Mass of the weight,               m = 1.99 kg

         Time period,                           T = 2 s

Let,

         The distance is d.

We know that the formula of the time period is given by

        [tex]T =[/tex] [tex]2\pi \sqrt{\frac{1}{(M+m)g} \frac{1}{3}ML^{2}+\frac{1}{(M+m)g}md^{2}}[/tex]

         4 = 4π² {1/3(1.23)(1.25)(1.25) + (1.99)d²}/{(1.23 + 1.99)9.8}

         94.668 = 6.034 + 10d²

         d = 2.98 m

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The frequency heard by the stationary observer is 468.44 Hz. Frequency is a measure of the number of cycles of a periodic phenomenon that occurs in a unit of time.

Frequency is an important concept in many areas of physics and engineering, including acoustics, electronics, and telecommunications. It is also used in other fields, such as biology and medicine, to describe the periodic phenomena that occur in those fields.  It is typically measured in Hertz (Hz), which is the number of cycles per second.

The frequency of the horn as heard by the stationary observer is given by the Doppler shift formula:

frequency_heard = frequency_emitted * (speed of sound + speed of observer) / (speed of sound - speed of car)

Plugging in the values given in the problem, we get:

frequency_heard = 450 hz * (331.5 m/s + 0 m/s) / (331.5 m/s - (45 mi/hr * 1609 m/hr / 3600 s))

Converting the speed of the car to meters per second, we get:

frequency_heard = 450 hz * (331.5 m/s + 0 m/s) / (331.5 m/s - 12.5375 m/s)

Simplifying the expression and converting the result to hertz, we get:

frequency_heard = 450 hz * (331.5 m/s) / (319 m/s)

frequency_heard = (450 hz * 331.5 m/s) / 319 m/s

frequency_heard = 450 hz * 1.0398936170212766

frequency_heard = 468.4414893617021 hz

So the frequency heard by the stationary observer is approximately 468.44 Hz.

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The force acting on the coil must also act parallel to the magnetic field if it is being accelerated parallel to the field.

A fundamental requirement that must be satisfied for current to be induced in a coil is that the magnetic field and force (acceleration) directions must be perpendicular to one another. As a result, current is induced in a path that is perpendicular to the directions in which the force acting on the coil and the magnetic field are moving. The coil would conduct this current either in a clockwise or anticlockwise direction. We may recast the change in fux as shown above because B is constant due to the constant magnetic Feld. Since A is a positive number, there will be a.

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(a) According to the photoelectric effect, the intensity of light corresponds to the density of photons; if you have a more intense beam of light, you have more photons. Since the frequency is higher than the minimum frequency required to overcome the work function of the metal, more photons imply that more electrons will be ejected from the metal. Therefore, the current in the phototube will be higher.

(b) Current is defined as charge per unit of time. Electrons are charged, and we said in part (a) that the current would increase, so the number of electrons emitted from the metal surface will increase as well.

(c) The maximum kinetic energy will not change because the energy of the incident photons is constant at E = hf and the work function (the energy taken away by the metal) is a constant depending on the particular metal.

(d) Momentum and kinetic energy, you will note, are basically the same thing since

                 KE = [tex]mv^{2} \frac{1}{2m} = p^{2} /2m[/tex]

So we get the same answer as in part (c); namely, the maximum momentum will remain the same independent of the intensity.

(e) The definition of the de Broglie wavelength is

                               λ = h/p

so, since the maximum momentum Pₘₐₓ is constant, and h is Planck's constant, the minimum de Broglie wavelength is constant.

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