WHY is the answer B? Please give scientifically sound explanation. Will give brainliest.

Explanation:

a) The fisherman sees the cage at a different location than where it actually is because of the refraction of light in water. When light travels from air into water, its speed decreases, causing the light to bend or refract. This means that the light entering the fisherman's eyes is coming from a slightly different direction than the actual position of the cage, making it appear as if the cage is in a different location.

b) To calculate the angle of the refracted ray in the camera lens, we can use Snell's law, which states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the refractive indices of the two materials.

Using this formula, we can calculate the angle of refraction in the lens:

sin(θ2) / sin(θ1) = n2 / n1

where n1 is the refractive index of water (1.40), n2 is the refractive index of the lens (1.49), and θ1 and θ2 are the angles of incidence and refraction, respectively.

Solving for θ2, we find:

θ2 = sin^-1(sin(θ1) * n1 / n2) = sin^-1(sin(37.2°) * 1.40 / 1.49) = 35.0°.

So, the refracted ray in the camera lens will be at an angle of 35.0° to the normal.

The average speed during the acceleration is 23.95 m/s.

The average speed of the car during the time it takes to accelerate can be calculated as the average of the initial and final speeds.

Speed is equal to the total distance covered by the car divided by the time required to cover the distance.

As per the given information,

The initial speed of the car is 13.5 m/s, and

the final speed is 34.4 m/s.

Therefore, the average speed can be calculated as:

Average speed = (initial speed + final speed) / 2

Average speed = (13.5 m/s + 34.4 m/s) / 2

Average speed = 23.95 m/s

Rounding to two decimal places, the average speed during the acceleration is 23.95 m/s.

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From the information provided,  each christmas tree bulb has a resistance of approximately 257.4 Ω.

To determine the resistance of each bulb, we first need to find the total resistance of the circuit. We can use Ohm's law to do this:

V = IR

where V is the voltage (120 V), I is the current, and R is the total resistance. Since the lights are connected in series, the current is the same through each bulb. We can use the power of each bulb (7 W) and the voltage to find the current:

P = IV

I = P/V = 7 W / 120 V = 0.0583 A

Now we can use Ohm's law to find the total resistance:

R = V/I = 120 V / 0.0583 A = 2059.5 Ω

Since there are eight bulbs, each bulb has the same resistance. We can find the resistance of each bulb by dividing the total resistance by the number of bulbs:

R_each = R_total / number of bulbs = 2059.5 Ω / 8 = 257.4 Ω

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The first image shows a speed - time relation in which the speed is zero and the the object is not moving. The second graph shows a constant velocity and the third one shows an increasing velocity with time.

A speed - time graph represents the change in speed of an object with respect to the time. The speed can be increasing with time or decreasing. Speed of an object is dependent on the path through which it is moving and the mass, frictional force etc.

Here, the first image shows no no values for the y - axis and and thus, the image is not moving. The second graph shows a parallel line which is showing there is no change in speed with the time. This indicates that the object is moving with a constant speed.

The graph C plots an increasing speed with respect to time. The straight line diagonal to the x, y axis indicates the increasing speed.

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V=3.39×10⁶ ×d for 0≤d≤0.005 m, 7.73x10⁷ m/s is the electric potential at a location 8.0mm from the negative plate, 3.0mm from the positive plate

a. Identify the unknown:

The potential everywhere

List the Knowns:

Charge density of the two plates: σ = ±30×10⁻⁶ C/m²

Distance between the two plates: d=5×10⁻³  m

Permittivity of free space: ε₀=8.85×10⁻¹² C²/N⋅m²

Set Up the Problem:

Since the σ are equal and opposite, this means that in the region outside of the two plates, the electric fields cancel each other out to zero: E = 0 The electric field between the plates is this strong:

E = σ/ε₀ = 30×10⁻⁶/8.85×10⁻¹² = 3.39x10⁶N/C

Possible variations between the positive plate and the negative plate include:

ΔV=Ed=3.39×10⁶ ×0.005=1.7×10⁴ V

Assuming the negatively charged plate is at the origin (d=0) and has no potential, the electric field is directed away from the positively charged plate and towards the negatively charged plate, the positive plate is at (d=+0.005 m) and have 1.7×10⁴ V

Solve the Problem:

V=0 for d<0

V=3.39×10⁶×d for 0≤d≤0.005 m

V=1.7×10⁴ V for d>0.005m

b. Identify the unknown:

when an electron leaves a state of rest at the negative plate and strikes the positive plate, how quickly it moves

List the Knowns:

Electron charge: e=1.6×10⁻¹⁹ C

Electron mass: m=9.11×10⁻³¹ kg

Set Up the Problem:

Potential and electric potential energy have the following relationships: = U/q

U=qV

To move the drop, this potential energy is converted to kinetic energy:

1/2mv²=qV

v = √2qV/m

Solve the Problem:

v = √(2×1.6×10⁻¹⁹×1.7×10⁴/9.11×10⁻³¹) = 7.73x10⁷ m/s

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The electrical energy consumed by the dryer in 1.5 minutes is 237,600 joules.

Electrical energy is a form of energy that results from the movement of electric charge. It is the energy that is transferred or converted when electric current flows through a conductor or a circuit.

Electricity is generated at power plants using various sources of energy such as fossil fuels, nuclear power, or renewable energy sources like wind, solar, or hydroelectric power. This electrical energy is then transmitted through high-voltage power lines and distributed to homes.

First we should calculate the power:

power = voltage x current

power = 220 V x 12 A = 2640 W

Now we can calculate the electrical energy consumed by the dryer in 1.5 minutes:

Electrical energy = power x time

= 2640 W x 90 s

= 237,600 joules (J)

The electrical energy consumed by the dryer in 1.5 minutes is 237,600 joules.

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The resolution limit of an optical system depends on both (a) The wavelength of light and (b) The diameter of the aperture. These two factors determine the diffraction limit, which is the smallest distance between two points that can be resolved by the optical system.

The wavelength of light affects the resolution limit because shorter wavelengths are able to resolve smaller details than longer wavelengths. The diameter of the aperture also affects the resolution limit because a larger aperture allows for more light to enter the system, which can improve the resolution.

The distance to the object being viewed (option c) and the distance from the aperture to the light detectors (option d) do not affect the resolution limit of an optical system. These factors may affect the overall image quality, but they do not determine the smallest distance between two points that can be resolved by the system.

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We cannot calculate the charge on the C2 capacitor without knowing the capacitance of the capacitor.

To determine the charge present on the C2 capacitor, we need to know the capacitance of the capacitor and the potential difference across it.

Assuming that the circuit is in steady state and neglecting any resistive losses, the potential difference across both capacitors will be equal to the applied potential difference of 6.11 V.

Let's call the capacitance of C2 as C2.

Then the charge present on the C2 capacitor can be calculated using the formula:

Q = C2 * V

where Q is the charge on the capacitor,

C2 is the capacitance of the capacitor, and

V is the potential difference across the capacitor.

Plugging in the values,

we get:

Q = C2 * V = C2 * 6.11 V

We cannot calculate the charge on the C2 capacitor without knowing the capacitance of the capacitor.

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Answer:

[tex]2\; {\rm \Omega}[/tex].

Explanation:

The lower case "[tex]r = 1\; {\rm \Omega}[/tex]" in the circuit diagram indicates that the internal resistance of this [tex]12\; {\rm V}[/tex]-battery is [tex]1\; {\rm \Omega}[/tex].

In practice, the rated [tex]12\; {\rm V}[/tex] voltage drop across this battery is split across not just the resistors in the external circuit, but also across the internal resistance of the battery.

The voltameter in this circuit measures the voltage drop across the [tex]3\; {\rm \Omega}[/tex] resistor and the unknown resistor [tex]R[/tex]. The voltage drop across the internal resistance and the other resistor (a total of [tex]1\; {\rm \Omega} + 4\; {\rm \Omega} = 5\; {\rm \Omega}[/tex]) would be [tex]12\; {\rm V} - 6\; {\rm V} = 6\; {\rm V}[/tex].

Divide the voltage drop by the resistance to find the current:

[tex]\begin{aligned}I &= \frac{V}{R} \\ &= \frac{6\; {\rm V}}{5\; {\rm \Omega}} = 1.2\; {\rm A}\end{aligned}[/tex].

Since this circuit is serial, current would be the same everywhere in the circuit. Given that voltage drop across the [tex]3\; {\rm \Omega}[/tex] resistor and the unknown resistor is [tex]6\; {\rm V}[/tex], the resistance of that part of the circuit would be:

[tex]\begin{aligned}\frac{6\; {\rm V}}{1.2\; {\rm A}} = 5\; {\rm \Omega}\end{aligned}[/tex].

Subtract the [tex]3\; {\rm \Omega}[/tex] from the resistance to find the value of [tex]R[/tex]:

[tex]R = (5\; {\rm \Omega} - 3\; {\rm \Omega}) = 2\; {\rm \Omega}[/tex].

The heat transfer in this situation would be transient, as the temperature of the room, the can, and the drink inside the can are all changing over time.

The heat transfer can be modeled as a two-dimensional problem, since the can is cylindrical in shape and the temperature of the can and the drink inside the can will only depend on the vertical and horizontal components of heat transfer. The coordinate system used to analyze the heat transfer problem would be cylindrical, since it is the most appropriate for modeling a cylindrical object. In this system, the radial direction is along the circular circumference of the can, and the axial direction is along the length of the can. The temperature of the can and the drink inside the can can then be calculated using the two-dimensional equations of heat transfer, which consider both the radial and axial components of heat transfer.

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Nichrome is used as a heating element in electric irons

High resistance: Nichrome has a high electrical resistance, which means that it converts electrical energy into heat energy efficiently. This makes it ideal for use in heating elements where heat generation is the primary requirement.

Good temperature stability: Nichrome has a high melting point and a low coefficient of thermal expansion. This means that it can maintain its structural integrity even at high temperatures and does not deform or break easily.

Corrosion resistance: Nichrome is resistant to corrosion, which makes it suitable for use in electrical appliances that are exposed to moisture, such as electric irons.

Long lifespan: Nichrome has a long lifespan and does not degrade easily even with repeated use. This makes it a reliable and durable choice for heating elements.

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The required acceleration of the car compared to g is 0.36 times the value of g.

The velocity v of the car is given as 193 mph = 193× 18/5 = 53.61 m/s.

The distance covered = 0.25 miles = 0.25× 1609 m/ 1 mile = 402.336 m

Initial velocity u = 0

Let us find the acceleration of the car using the equation of motion.

v² - u² = 2 a s

where,

v is final velocity

u is initial velocity

a is acceleration

s is distance

Entering values in the above equation, we have,

53.61² - 0 = 2 a (402.336)

804.672 a = 2874.03

a = 3.57 m/s²

Let us compare it with the value of 'g',

a/g = 3.57/9.8 = 0.36

So, a = 0.36 g

Thus, the acceleration of the car is 0.36 times the value of g.

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Therefore, the answer to this question is that it cannot be determined without more information.

The answer to this question can be determined by comparing the velocity of the two objects.

The formula for momentum is:

We can rearrange this formula to solve for velocity:

We can plug in the given values:

For the other object, we do not have enough information to determine its velocity. We would need to know its mass and momentum in order to calculate its velocity and compare it to the horse's velocity. Without this information, we cannot determine which object is moving faster. Therefore, the answer to this question is that it cannot be determined without more information.

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When producing modest swings, the amplitude frequently has no impact at all on the pendulum's period. There is a tiny but insignificant rise in the period when the pendulum's amplitude is greater.

The distance to travel increases as the amplitude rises, but when the restoring force rises as well, the acceleration rises correspondingly.

This implies that the mass can move faster and cover a bigger distance. Since these qualities cancel one another, amplitude has no bearing on period.

A straightforward harmonic oscillator's period is independent of its amplitude. with the graphs of acceleration and velocity produced by the time derivatives. These oscillators also show how kinetic and potential energy can be transferred.

Therefore, the length of time is unrelated to the vibration's magnitude. Time period is unchanged by doubling the oscillation's amplitude.

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Jacob reports that as he varies the charge on the left particle, he observes that the force between the two particles changes.

Specifically, when the charge on the left particle is positive, the force between the two particles is attractive, and when the charge on the left particle is negative, the force between the two particles is repulsive. This is because opposite charges attract and like charges repel. As the magnitude of the charge on the left particle increases, the force between the two particles increases as well. The force of attraction is strongest when the charges on both particles are the same, and the force of repulsion is strongest when the charges on the particles are opposite.

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According to the kinetic theory of gases, collisions between the molecules in a gas are perfectly elastic.

It means that the total kinetic energy of the colliding molecules is conserved. This means that during a collision, the molecules may exchange energy and momentum with one another, but the total amount of energy and momentum remains constant.

In addition, according to the kinetic theory, the molecules in a gas are in constant random motion and travel in straight lines until they with each other or with the walls of their container.

The average kinetic energy of the molecules is proportional to the temperature of the gas, and the pressure of the gas is proportional to the number of collisions the molecules make with the walls of the container in a given amount of time. The kinetic theory provides a useful framework for understanding the behavior of gases at the molecular level.

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They experience the same size force. Both car and dump truck will experience the force of same magnitude. The main difference is the change in acceleration which is greater for smaller car.

Collision is when two or more objects collide with each other, either directly or indirectly. In physics, collision is defined as the interaction between two or more bodies, where the total kinetic energy of the two bodies before the collision is greater than the sum total of the entire kinetic energy of the two bodies after the collision.

Collisions can involve two or more objects and can be elastic or inelastic. Elastic collisions involve objects that bounce off of each other and inelastic collisions involve objects that stick together after the collision. Collisions can also involve two or more particles, where the particles interact and exchange energy, momentum and angular momentum.

Both car as well as the dump truck will experience the force of same magnitude.

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The required time for the light to reach Saturn from the Sun is calculated to be 76.4 min.

It is given that the light takes 8 minutes to reach the Earth from the Sun.

We are told to determine how long it takes for light to travel from the Sun to Saturn.

The distance between the Saturn and the Sun is given as 9.55 au.

Distances in solar system are measured in astronomical units.

The separation between the Earth and the Solar is 1 au.

For 1 au, it takes 8 minutes.

So, for 9.55 au it takes, 9.55(8) = 76.4 min.

As a result, it takes some time for the radiation from the Sun to reach Saturn.

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It is quite easy.

Say that the work you did was w, so that the force you exert is F.

Furthermore, the displacement is s.

AT THIS TIME

the work you(w)=Fs

Now,  AT YOUR NEIGHBOR'S CASE.

Let his work be credited as W

IF, then force is half, or F/2.

with five times the displacement.

therefore, work done (W)=F/2*5s

hence, W=2.5Fs

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Answer:

118,000 J

Explanation:

The law of conservation of energy states that the total energy in a system remains constant, it can be transformed from one form to another, but the total energy remains the same.

Given that the total energy of the object is 210,000 J, and its potential energy at a certain point along the track is 92,000 J, we can use the law of conservation of energy to find the kinetic energy of the object at that point.

The total energy of the object is equal to the sum of its kinetic energy (KE) and its potential energy (PE):

E_total = KE + PE

Substituting the given values:

210,000 J = KE + 92,000 J

Solving for KE:

KE = 210,000 J - 92,000 J = 118,000 J

So, the object has a kinetic energy of 118,000 J at the same point where its potential energy is 92,000 J.

This follows the law of conservation of energy because the total energy of the object remains constant, and the change in potential energy is equal to the change in kinetic energy.

Answer:

a) Electric resistance: The basic dimensions of electric resistance are resistance (R) which has the dimension of [mass] x [length]^2 / [time]^3.

b) Universal Gas Constant: The basic dimensions of the Universal Gas constant (R) are [energy]/[temperature x amount of substance]. These dimensions can be expressed as [mass] x [length]^2 / [time]^2 / [temperature] x [amount of substance].

Explanation:

Field A has higher r than field B, as the former has had more time to establish reliable methods and a more stable consensus within the scientific community.

Let's assume that "r" refers to the replicability of results within a given scientific field. That is, how likely it is that the results of a given study will be replicated in subsequent studies.

Based on the information given, we can infer that field A has a smaller community of scientists and a well-established set of hypotheses and theories. This indicates that the field has had more time to develop and refine its methods and that there is a higher degree of consensus among the scientific community about what research questions are important and how to approach them. These factors suggest that the replicability of results in field A is likely to be higher.

On the other hand, field B is described as being in an exploratory phase, with a larger community of researchers and a more recent influx of attention. This suggests that the field is still in the process of establishing a set of well-defined hypotheses and methods, which may lead to more variability in research results and lower replicability.

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A Hilbert-transform filter is used to generate an SSB signal.

A Single Sideband (SSB) signal is generated by filtering one sideband of a modulated signal and suppressing the other sideband and the carrier signal. The most common way of generating an SSB signal is by using a Hilbert-transform filter.

This filter is used to shift the phase of the modulated signal by 90 degrees, effectively converting the upper sideband to the lower sideband, or vice versa. By filtering out one of the sidebands, the SSB signal can be generated. Therefore, option C is the correct answer.

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--The complete question is, What type of digital signal processing filter is used to generate an SSB signal?

A. An adaptive filter

B. A notch filter

C. A Hilbert-transform filter

D. An elliptical filter--

The efficiency of the machine is  90%.

The efficiency of a machine is defined as the ratio of output work to input work.

Output work = Force x Distance x Load

Output work  = 450 N x 2 m

Output work = 900 J

The input work is the work done by the machine, which is equal to the product of the force applied to the machine and the distance through which it moves

Input work = Force x Distance = 1000 J

The efficiency of the machine is the ratio of output work to input work:

Efficiency = Output work / Input work

E = 900 J / 1000 J

E = 0.9

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Rainbow is a natural phenomenon showing dispersion. Splitting light is known as dispersion of light. The reason is correct for the given assertion.

Dispersion is the phenomenon in which the phase velocity of a light wave depends on its frequency. It is sometimes also termed as chromatic dispersion, which is used for the specificity to optics in particular. A medium having this common property may be termed as a dispersive medium.

A rainbow is a meteorological phenomenon which is caused by the reflection, refraction and dispersion of light in the water droplets resulting in a spectrum of light appearing in the sky. This takes the form of a multicolored circular arc. Rainbows are caused by the sunlight which always appear in the section of sky directly opposite the Sun.

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Your question is incomplete, most probably the complete question is:

Assertion - Rainbow is a natural phenomenon showing dispersion.

Reason - Splitting light is known as dispersion of light

What is right answer?

Every tube in the load must have a companion right across in the rotor holder in order for the centrifuge to be balanced.

In many laboratories, centrifuges are employed to separate fluids, gases, or liquids according to their densities. Centrifuges are often employed in clinical and research facilities for the purification of cells, organelles, viruses, proteins, and nucleic acids.

The separation of different components of whole blood using a centrifuge is an example of its usage in a clinical environment. Serum or plasma is required for several tests and can be obtained by centrifugation.

A full blood sample is allowed to clot at room temperature in order to get serum. The clot is subsequently removed from the sample by centrifugation, leaving a serum supernatant behind.

Plasma, in contrast to serum, is made from whole blood that has not been allowed to clot; it contains serum as well as clotting factors. A full blood sample is taken in tubes that have been anticoagulant-treated in order to get plasma.

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The stored energy that can be used to do work is called Potential energy

while the energy of motion used to do work is called kinetic energy.

Potential energy is simply stored energy that, depending on its surroundings or circumstances, a thing may use. Potential energy is the energy that is held inside a system of physically interacting things, to use terminology more closely related to physics.

Kinetic energy, often known as the energy of motion, may be seen in the motion of things and subatomic particles. Kinetic energy may be found in all particles and moving objects. Examples of kinetic energy in action include a person walking, a baseball flying through the air, food tumbling off a table, and a charged particle in an electric field. Everything contains kinetic and potential energy. Kinetic energy is the ability to move anything (KE). Energy is a potential form of energy (PE).

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An object that is travelling to the right would accelerate in the same direction as its motion, which would be to the right. This is so because acceleration, which encompasses both speed and direction of motion, is the rate at which velocity changes.

If an object is going to the right and then accelerates, the acceleration would also be moving to the right, following the motion. This is so because acceleration, which encompasses both speed and direction of motion, is the rate at which velocity changes. While the item in this instance is moving faster, its velocity is rising in the same direction as its motion, and consequently, the acceleration is likewise moving faster. The other possible solutions don't work in this case.The rate at which velocity changes is known as the acceleration, which is a vector quantity. The speed and direction of motion of an object are described by a vector called velocity.

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Answer:

Explanation:

ij42fom2k jjnjmiok3ofnf jnk jn kj j vjk v

The time it will take the rocket  to hit the ground is 7.92 seconds

The rocket will hit the ground when its height, h, is equal to zero. To find the time, t, when this happens, we can set h equal to zero and solve for t:

-4.97t^2 + 38.5t + 5.6 = 0

We can use the quadratic formula to solve for t:

t = (-b ± √(b^2 - 4ac)) / 2a

where

a = -4.97,

b = 38.5, and

c = 5.6

Plugging in these values, we solve for time of motion:

t = (-38.5 ± √(38.5^2 - 4(-4.97)(5.6))) / 2(-4.97)

t = (-38.5 ± √(1486.25 + 94.544)) / -9.94

t = (-38.5 ± √(1580.794)) / -9.94

t = (-38.5 ± 39.939) / -9.94

t = (-38.5 - 39.939) / -9.94

t = (78.439) / -9.94

t = 7.92 seconds

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