Which term is defined as the ratio of the speed of light in a vacuum to the speed of light in the material it is passing through?

A. index of refraction
B.index of reflection
C.angle of reflection
D.angle of incidence

Answer:

The statement that correctly describes the curve is : ( A )

Given that the temperature is at 40 degrees the water is at its liquid state  while at the plateau stage ( RS ) the liquid water changes its state to gaseous. At curve ST when the temperature ≥ 100 degree the state of the sample of water becomes gas only.

Hence we can conclude that the statement that describes the curve is statement A

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Final answer:

To determine the initial temperature of the 65.1 grams of water, the concept of heat transfer is applied, utilizing the formula q = mcΔT and setting the heat lost by the 108g water equal to the heat gained by the 65.1g water.

Explanation:

To find the initial temperature of the 65.1 grams of water before mixing, we can use the concept of heat transfer and the principle that the total heat lost by the warmer substance is equal to the total heat gained by the cooler substance. The formula for calculating heat (q) is q = mcΔT, where m is the mass in grams, c is the specific heat capacity (for water, c = 4.18 J/g°C), and ΔT is the change in temperature.

For the 108 grams of water cooling down: q = (108g)(4.18 J/g°C)(47.9°C - 22.5°C).

For the 65.1 grams of water heating up: q = (65.1g)(4.18 J/g°C)(47.9°C - T), where T is the initial temperature of the 65.1g water sample.

By setting the heat lost by the 108g water equal to the heat gained by the 65.1g water and solving for T, the initial temperature of the 65.1 grams of water can be determined.

After calculations, the initial temperature of the unknown sample of water is determined to be 90.01°C.

To find the unknown temperature of the 65.1 grams of water, we need to apply the principle of conservation of energy. The heat gained by the 108 grams of water at 22.5°C must equal the heat lost by the 65.1 grams of water at the unknown temperature.

Using the formula for heat transfer:

Q = mcΔT,

where:

Step-by-Step Calculation:

Calculate the heat gained by the 108 g of water:

Q_gained = (108 g) * (4.18 J/g°C) * (47.9°C - 22.5°C).

Q_gained = 108 g * 4.18 J/g°C * 25.4°C = 11472.912 J.

Let T be the initial temperature of the 65.1 g of water. Calculate the heat lost by this water:

Q_lost = (65.1 g) * (4.18 J/g°C) * (T - 47.9°C).

Since heat gained = heat lost, set Q_gained equal to Q_lost:

11472.912 J = (65.1 g) * (4.18 J/g°C) * (T - 47.9°C).

Solve for T:

11472.912 J = 272.418 J/°C * (T - 47.9°C).

11472.912 J / 272.418 J/°C = T - 47.9°C.

42.11°C = T - 47.9°C.

T = 42.11°C + 47.9°C.

T = 90.01°C.

Therefore, the temperature of the other sample of water was 90.01°C.

Answer:

b. False

Explanation:

An object that is behind you, is not in your cone of vision, since your cone of vision, is an imaginary cone that projects from your eyes foward, approximate 60-degree angle straight foward. The cone of vision is the area of sight.

As you can not see behind you, an object behind you, is not in your cone of vision.

There are various uses of electromagnets in modern technology.

The first and very recent use of electromagnet is magnetic levitation train. Here strong electromagnets are used by which the magnetic levitation of train and its propulsion become possible.

The second use of electromagnet is lifting heavy plates of magnetic metals from shore to the ship.

The electromagnets are also used in various kinds of electric devices like speakers,generators,motors and hard disk drivers etc. In electric bells,the electromagnetic coils are used which helps in striking the bell.

The electromagnets are also used in casa of cyclotron. In case of cyclotron,strong electromagnetic dees are present which plays a crucial role in accelerating the charged particle.

Answer:

The zebra and domestic horse belong to the same genus.

Explanation:

Did on odyssey

Answer:

Conductors allow electric charges to move freely

Final answer:

The distance light travels in the time it takes sound to travel 1 cm in air at 20°C is approximately 8.75 × 10^5 cm.

Explanation:

The speed of sound in air can be approximated using the formula v = 331.4 m/s + 0.6T, where T is the temperature of the air in Celsius. At 20°C, the speed of sound is approximately 343 m/s. To find the distance light travels in the time it takes sound to travel 1 cm in air at 20°C, we can set up a proportion.

If sound travels 1 cm in air at a speed of 343 m/s, we can set up the following proportion:

343 m/s / 1 cm = c / x

where c is the speed of light and x is the distance light travels in the same time. Solving for x, we find:

x = (1 cm) * (c / 343 m/s)

Substituting the speed of light c = 3.0 × 10^8 m/s, we can calculate the distance light travels:

x = (1 cm) * (3.0 × 10^8 m/s / 343 m/s)

x ≈ 8.75 × 10^5 cm

answer BBBBBBBBBBBB on EDGE

Answer:

a larger current in the opposite direction

Explanation:

As we know by Faraday's law of electromagnetic induction that rate of change in magnetic flux will induce electric current in a conducting coil linked with it

so it is given as

[tex]EMF = \frac{d\phi}{dt}[/tex]

now in this situation we know that first a magnet is entering into the coil so here the magnetic flux is increasing linked with the solenoid coil.

So it will induce some current in the coil which shows deflection in galvanometer coil.

Now when we pull the magnet out then it will decrease the flux linked with the coil so here the direction of induced current must have to decrease.

Also it is given that coil is removed at faster rate due to which the rate of change in flux will be more so here it will induce more current

so correct answer would be

a larger current in the opposite direction

Answer:

m=40.8km.

Explanation:

T

1

=

1

=80Hz

The basic relationship bet

where

\lambdaλ is the wavelength of the wave

v is its speed

f is its frequency

If we plug the numbers given by the problem into this equation, we can find the wavelength of this wave:

\lambda= \frac{v}{f}= \frac{3.26 \cdot 10^6 m/s}{80 Hz}=4.08 \cdot 10^4 m=40.8 kmλ=

f v

=

80Hz

3.26⋅10

6

m/s

=4.08⋅10

4

m=40.8km

In the reaction, Zn(s) + S(s) -> ZnS(s), Zinc (Zn) and Sulfur (S) are the reactants and Zinc Sulfide (ZnS) is the product. This type of reaction is known as a combination or synthesis reaction.

In a chemical reaction, substances that interact are called reactants, and the newly formed substances are called products. In the reaction you have given, Zn(s) + S(s) -> ZnS(s), the reactants are zinc (Zn) and sulfur (S), and the product formed is zinc sulfide (ZnS). This type of reaction is a synthesis or combination reaction wherein two or more simple substances combine to form a more complex substance. It's important to note that in this reaction, Zn and S are in their elemental forms and the reaction represents the process of sulfide mineral formation.

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In the reaction Zn(s) + S(s) → ZnS(s), the reactants are zinc (Zn) and sulfur (S), both in solid form. The product is zinc sulfide (ZnS), also in solid form. This is a synthesis reaction where the elements combine to form a single compound.

Reactants and Product of Zn(s) + S(s) → ZnS(s)

In the chemical reaction Zn(s) + S(s) → ZnS(s), the reactants are zinc (Zn) and sulfur (S), both in their solid forms. The product of this reaction is zinc sulfide (ZnS), which is also in the solid state. Here is the step-by-step identification:

Reactants: Zinc (Zn) and Sulfur (S)

Product: Zinc Sulfide (ZnS)

This reaction is an example of a synthesis reaction, where two or more elements combine to form a single compound.

Answer:

80 km/hr

Explanation:

We are given that

Total distance covered by the car=120 Km

Time taken by the car=90 minutes=[tex]\frac{90}{60}=1.5 hour[/tex]

We have to find the speed of the car

We know that Speed=[tex]\frac{Distance}{time}[/tex]

Substitute the value then, we get

Speed=[tex]\frac{120}{1.5}=80 Km per hour[/tex]

Hence, the speed of the car=80 km per hour.

it decreases by a factor of 2

In a series circuit, the resistors are arranged in a series and where, the current is inversely proportional to the resistance. Thus when resistance is increased to 6 ohm current will decreases to half.

Resistance is a physical quantity and is the measure of resistance to the current. It has a unit called Ohm. The device which is used to measure the resistance in a circuit is called a resistor.

According to Ohm's law, the product of current and resistance in a circuit is the voltage or potential difference in the circuit V.

I.e., V = I R.

As per this relation it is clear that the resistance and current in a circuit are in inverse proportionality. Therefore we have the equation relation them as:

I1/ I2 = R2/ R1

It is given that the initial resistance of 3 ohm increased to 6 ohm. Thus current will decrease there to half since resistance is increase to double.

Therefore, current will reduces to half of its initial value.

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The question involves a block sliding down a 30-degree incline, where the forces of gravity, normal force, and friction are in effect. The acceleration of the block can be determined by taking into account all the forces acting on it. This is a topic in Physics, typically studied at the high school level.

In the described scenario, a block is sliding down a rough ramp inclined at 30 degrees. This topic falls under the area of Physics, specifically in the study of friction and forces. The forces at play in this situation are gravity, normal force, and frictional force. When a block slides down an inclined plane, the force of gravity is divided into two components. The component parallel to the ramp, mg sin θ, acts downwards and is opposed by the force of friction.

The frictional force is determined by multiplying the normal force by the coefficient of friction (μ). This could be represented as F = μN, where F is the frictional slide and N is the normal force. The block's acceleration depends on the net force acting on it, considering all the forces at play.

In this particular situation, where there's a known coefficient of friction of 0.20 and given gravitational and normal forces are 40 N, you can use these values, along with the angle of the ramp, to find the acceleration of the block using formulae from physics.

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A block sliding down a rough incline experiences forces from gravity, friction, and normal force. Friction opposes the motion, reducing the acceleration the block would have on a frictionless slope. The acceleration can be calculated from the incline angle and friction coefficient.

The question deals with the physics of a block sliding down a rough, incline plane. When a block is sliding down an inclined plane, there are several forces at play. The gravitational force pulls the block downwards, the normal force counters this directly perpendicular to the slope, and friction acts to oppose the motion of the block. The coefficient of friction between the block and the incline plays a crucial role in the block's acceleration down the incline.

The acceleration of the block can be calculated using the formula a = g sin θ, where g is acceleration due to gravity and θ is the incline angle. However, this applies when there's negligible friction. If friction is involved, it reduces the acceleration from this value. The acceleration on an incline where there is friction can be calculated with the equation ax = g sin θ - μk g cos θ, where μk is the coefficient of kinetic friction.

Using the equation above, you can calculate acceleration if you are given the friction coefficient and the incline's angle. However, if you're given the acceleration and either the incline angle or friction coefficient, you can rearrange the equation to calculate the missing variable, helping you gain more understanding about the impacts of the slope and friction.

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Light microscopes use glass or plastic lenses to magnify specimens, consisting of an objective lens and an eyepiece. They can magnify up to 2000 times, but the resulting image is upside-down and reversed. Staining may be required for transparent cell components, although this often kills the cells.

The lenses found in a light microscope are typically made of glass or plastic and are designed to focus light on the specimen to produce an image. The most basic type is the compound microscope which consists of two main types of glass lenses: the objective lens and the eyepiece or ocular lens. The objective lens, which is near the specimen, often has a range of magnification powers from 5x to 100x. These objective lenses are usually parfocal, meaning they are set up so that the sample remains in focus when the objectives are switched. The eyepiece then further magnifies this image. Together, these lenses allow for a significant magnification of the specimen, causing an upside-down and reversed image due to the nature of the optics involved. Light microscopes are commonly used because they are suitable for viewing living organisms, but sometimes staining is necessary to make transparent cell components visible, which usually results in the death of the cells.

high energy photons have high frequencies hope this helps brother

A redshift in the spectra of distant galaxies indicates that these galaxies are moving away from us due to the expansion of the universe. This discovery by Edwin Hubble has given astronomers a way to determine the distance of galaxies and observe the universe's evolution and age.

The redshift observed in the spectra of distant galaxies indicates that these galaxies are moving away from us. This is a result of the Doppler Effect, a phenomenon that causes a wave's frequency to appear different than its original frequency due to the relative motion of the source and observer. The higher the redshift - the more the hydrogen emission lines are displaced to the red end of the spectra - the faster the galaxies are receding.

In 1929, astronomer Edwin Hubble observed this redshift and found it was proportional to the galaxies' distance from us, which led him to conclude that the universe is expanding. This means not only are galaxies moving away from us, but the space within the universe itself is increasingly getting larger.

This discovery has offered astronomers crucial insights into the age and evolution of the universe. The amount of redshift can be used to determine the distance to a galaxy, and consequently, looking at the redshifted light enables astronomers to 'look back' in time and see the state of the universe billions of years ago.

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Answer: Away from the observer, faster than the speed of sound.

Based on the pattern of sound waves, the direction of the car is away from the observer for the wave fronts have spaced out and the speed of the car is faster than the sound. This happen because a lower frequency of wave peaks is observe as the source of the sound travels away from the observer.

Answer:

The answer is C

Explanation:

The correct current value is 1.35 A.

The correct current value in the 0.5 dcma position can be determined using the given information. According to the information provided in the question, after 5.00 ms, the current declines to 0.368 of the initial value at t=0. Therefore, we can find the initial value of the current by dividing the value at t=5.00 ms by 0.368. Let's calculate:

Initial current = (0.368)(3.68 A) = 1.35 A

So, the correct current value if the selector is in the 0.5 dcma position is 1.35 A.

The power factor required to lift the beam twice as high in half the original time is : 4

Given that :

Power ( P ) = Work done / time  -- ( 1 )

Also work done for a lifted load

Work done = mgh  ( mass * gravity * height   )

Back to equation ( 1 )

Power ( p )  = mgh / time  --- ( 2 )

Considering the conditions given

When;  h = 2 * h  and t = 1/2 * t

Power becomes

New Power = m*g*2h / 1/2* t

             = 4( m*g*h / 2

Therefore we can conclude that The power factor required to lift the beam twice as high in half the original time is : 4.

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