The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is _______________
as it changes into other forms of energy.

Answer: The light bends because light travels fast but it slows down in a denser medium. For example light refracts in water or it bends after passing through air. When light passes through air ( a less dense medium ) then through water ( a more dense medium ) the beam of light bends because light travels more slowly in a denser medium then it picks up its pace again once it passes. The density of the substance determines how much the light is refracted. I hope this makes sense and I hope this answered your question!! :)

Answer:

8.58 ms-²

Explanation:

v = u + at

26.6 = 0 + a×3.1

a = 26.6/3.1

8.58 ms-²

Answer:

4 smaller disks

Explanation:

We are given;

Mass of smaller and larger disks = M

Radius of smaller disk = R

Radius of larger disk = 4R

Formula for moment of inertia about cylinder axis is:

I = ½MR²

Thus;

For small disk, I_small = ½MR²

For large disk, I_large = ½M(2R)² = 2MR²

We are told that moment of inertia of System A consists of two of the larger disks. Thus;

I_A = 2 × I_large = 2 × 2MR²

I_A = 4MR²

We are also told that System B consists of one of the larger disks and a number of the smaller disks. Thus;

I_B = I_large + n(I_small)

Where n is the number of smaller disks.

I_B = 2MR² + n(½MR²)

I_B = MR²(2 + n/2)

We are told that the moment of inertia for system A equals the moment of inertia for system B. Thus;

I_A = I_B

So;

4MR² = MR²(2 + n/2)

MR² will cancel out to give;

4 = 2 + n/2

Multiply through by 2 to give;

8 = 4 + n

n = 8 - 4

n = 4

Answer:

D. The acceleration is downward at all points in the motion

Explanation:

:D

The charge on each sphere would be 5.89 × 10^-8 C.

The electrostatic force between two charged spheres is given by Coulomb's law:

F = (1/4πε) * (q1*q2)/r^2

In this case, the spheres have equal and opposite charges, so we can write:

F = (1/4πε) * (q^2)/r^2

where q is the charge on each sphere.

We are given that the force between the spheres is 103 N, the distance between them is 10 cm (0.1 m), and the dielectric constant of the medium is 5.

Substituting these values into the equation above, we get:

103 = (1/4π58.85*10^-12) * (q^2)/(0.1)^2

Solving for q, we get:

q = ± 5.89 × 10^-8 C

Since the spheres have equal and opposite charges, we take the absolute value of q to get the charge on each sphere:

q = 5.89 × 10^-8 C

Therefore, each sphere has a charge of 5.89 × 10^-8 C.

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Answer:

the density is 2

Explanation:

mass divided by volume is density

16 divided by 8 is 2

Answer:

B. blocks 2 & 3.

Explanation:

Block 1 has equal & opposite forces acting on it.

Block 2 has 5N on one side, 3N on the other. It will move in the direction the 5N of force is pushing.

Block 3 has no opposing force.

The two charges are 1.73 x 10⁻⁶ C and 3.46 x 10⁻⁶ C.

According to Coulomb's Law, the force between two point charges is given by the equation

F = (kq₁q₂)/r²,

where k is the Coulomb's constant, q₁ and q₂ are the charges, and r is the distance between them.

Given that the distance between the two charges is 60.0 cm or 0.6 m, and the force between them is 85.0 N, we can plug these values into the equation to find the charges. 85.0 N = (kq₁q₂)/(0.6 m)²

We are also told that one charge is twice the value of the other, so we can let q₁ = 2q₂ and substitute into the equation:

85.0 N = (k(2q₂)(q₂))/(0.6 m)²

Solving for q₂, we get:

q₂ = sqrt((85.0 N)(0.6 m)²)/(2k)

Using the value of k = 8.99 x 10⁹ Nm²/C², we can plug this into the equation and solve for q2:

q2 = √((85.0 N)(0.6 m)²)/(2(8.99 x 10⁹ Nm²/C²)) q₂ = 1.73 x 10⁻⁶C

And since q₁ = 2q₂, we can find the value of q₁:

q₁ = 2(1.73 x 10⁻⁶ C) = 3.46 x 10⁻⁶ C

Therefore, the two charges are 1.73 x 10⁻⁶ C and 3.46 x 10⁻⁶C.

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According to special relativity, the correct option is c) light moves at the same speed independent of the motion of the source. This principle is one of the fundamental tenets of special relativity and is known as the constancy of the speed of light.

In special relativity, the theory developed by Albert Einstein, the speed of light in a vacuum, denoted by 'c', is considered a fundamental constant of nature. It is the same for all observers, regardless of their motion relative to the source of light. This principle is known as the constancy of the speed of light.

One of the key consequences of this principle is that the speed of light is independent of the motion of the source. Whether the source of light is moving towards or away from an observer, the speed of light remains unchanged. This has been experimentally verified and has significant implications for our understanding of space, time, and the nature of reality.

Calculations are not required to explain this principle. The constancy of the speed of light is a fundamental postulate of special relativity, which has been validated through numerous experimental observations and is supported by a wide range of evidence and theoretical consistency.

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The energy of the photon is approximately 0.263 fJ (femtojoules).

To find the energy of the photon, we can use the equation E = (h * c) / λ, where E represents energy, h is Planck's constant, c is the speed of light, and λ is the wavelength of the photon.

The speed of light is given as 3.00 × \(10^8\) m/s, so we don't need to make any conversions.

The given wavelength is 0.653 nm. To convert it to meters, we need to multiply it by a conversion factor. Since 1 nm is equal to 1 × 10^-9 meters, we can multiply 0.653 nm by 1 × \(10^-^9\) to get the wavelength in meters: 0.653 × \(10^-^9\)m.

Now, we can use the formula E = (h * c) / λ. Plugging in the values, we get:

E = (6.262 × \(10^-^3^4\) J·s * 3.00 ×\(10^8\) m/s) / (0.653 × 10^-9 m).

After simplifying the expression, we find:

E ≈ 0.263 fJ (femtoJoules).

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Answer:

Janaki temple and Pashupatinath Temple are found in Nepal. These structures are religious and they increase the pride of the country through tourism. These temples are important in the country and are mostly visited by tourists.

This also helps to bring in income for the country and also helps by attracting many visitors and a corresponding development of its tourism industry.

First we need to use a system of equations. Let's let x be the number of hours that the Jenkins family used their sprinkler, and y be the number of hours that the Clark family used their sprinkler. Then we can write two equations:

x + y = total number of hours
10x + 6y = total water output

We know that the total number of hours is given as hours, and the total water output is given as gallons. Substituting these values into our equations, we get:

x + y = 120
10x + 6y = 840

Now we can solve for x and y. Multiplying the first equation by 6, we get:

6x + 6y = 720

Subtracting this equation from the second equation, we get:

4x = 120

Solving for x, we get:

x = 30

Substituting this value into the first equation, we get:

30 + y = 120

Solving for y, we get:

y = 90

Therefore, the Jenkins family used their sprinkler for 30 hours, and the Clark family used their sprinkler for 90 hours. This solution checks out, since 10(30) + 6(90) = 840, which is the total water output.

In conclusion, the Jenkins family used their sprinkler for 30 hours and the Clark family used their sprinkler for 90 hours. This gives us a total water output of 840 gallons. This answer is based on the system of equations that we set up and solved, and we can be confident that it is correct.

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We know that water is denser than air or a piece of paper is denser than rock.

How do we determine density?

Density is determined by measuring it’s mass and then dividing it by it’s volume.  

Let us take a solid cube of aluminium.

(i) The readings to be taken are the mass of aluminium and volume of aluminium.

(ii) Instruments used are :

(iii) We will check the mass of the aluminium cube by simply putting it on the weighing machine. Now we will check the volume by putting that cube into the water. The initial level was x. The water level rises to y after putting the cube into it. To know the volume, we will simply subtract y-x. Hence, we know the volume.

To know the density, divide mass by volume. (Mass / volume)

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Answer:

The first question is c and the third one is b

Answer:                                                                                                                     It states that an object in motion will stay in motion, and an object at rest will stay at rest unless acted upon by an unbalanced force.

Explanation:

hope i helped

Answer: A object that is currently in motion will stay at motion. The law of interia is also known as Newton's first law of motion.

Explanation:

Answer:

A newspaper is a serial publication which contains news on current events of special or general interest.

Answer/Explanation:

Newspapers are generally published daily, weekly, and bi-weekly, although they may have less regular publication schedules. A regularly published collection of fairly brief articles that provide updates on current events and interests.

Answer:

35%

Explanation:

Answer:

its 83

Explanation:

The force that helps keep Earth in orbit is the Sun’s gravity.

An orbit is a continuous path that an object takes in space under the influence of gravity from another object that moves it like Earth orbiting the Sun. To stay in orbit, an object should have enough speed to counterbalance the gravity that pulls it toward the planet it orbits; it must have a horizontal component of its motion that's balanced with the vertical component.

Gravity is an attractive force between two objects with mass, like Earth and the Sun. The Sun's gravity provides the centripetal force necessary to keep Earth in its elliptical orbit around the Sun. Without the Sun's gravity, Earth would travel in a straight line through space.

Inertia is an object's resistance to a change in its motion. The planets have a lot of inertia, and once they're set in motion, they remain in motion until acted on by an outside force. The Sun's gravity acts as the force that keeps Earth and the other planets in their orbits. So, the force that helps keep Earth in orbit is the Sun’s gravity.

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This question involves the concepts of the law of conservation of momentum and speed.

She moves with a speed of "0.41 m/s".

Applying the law of conservation of momentum to this situation, we get:

\(m_1u_1+m_2u_2=m_1v_1+m_2v_2\)

where,

m₁ = mass of shirley = 65 kg

m₂ = mass of tank = 12 kg

u₁ = initial speed of shirley = 0 m/s

u₂ = initial speed of tank = 0 m/s

v₁ = final speed of shirley = ?

v₂ = final speed of tank = 2.2 m/s

Therefore,

\((65\ kg)(0\ m/s)+(12\ kg)(0\ m/s)=(65\ kg)(v_1)+(12\ kg)(2.2\ m/s)\\\\v_1=\frac{-26.4\ kg.m/s}{65\ kg}\\\\v_1=-0.41\ m/s\)

negative sign shows the opposite direction.

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If the emergency air line breaks or gets pulled apart while driving, the loss of pressure will cause the emergency parking brakes to activate automatically.

This is a safety mechanism designed to bring the vehicle to a stop and prevent it from moving any further. The emergency brakes are spring-loaded, which means they engage automatically when air pressure is lost.

Once the brakes are engaged, the vehicle will not be able to move until the air line is fixed and pressure is restored.

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Gas particles can change to solid particles if the temperature decreases.

The state of matter of a substance is determined by its temperature and pressure. When the temperature of a gas decreases, its particles lose kinetic energy and slow down. This decrease in kinetic energy leads to a decrease in the average speed of gas particles.

As the temperature continues to decrease, the particles lose energy and move closer together. At a certain temperature known as the condensation point or the freezing point, the gas particles no longer have enough energy to overcome the intermolecular forces holding them together.

At this point, the gas undergoes a phase transition and changes into a solid. The process of gas turning into a solid is called condensation or freezing, depending on the specific substance.

During condensation, the gas particles arrange themselves in a more orderly and structured manner, forming a solid. The transition from gas to solid involves the release of energy, known as heat of fusion.

In summary, when the temperature of a gas decreases below its condensation or freezing point, the gas particles lose energy, slow down, and eventually come together to form a solid.

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(a) To find the kinetic energy of the fastest ejected electrons, we need to use the equation:

KE = hf - W

where KE is the kinetic energy of the electron, h is Planck's constant (6.626 x 10^-34 J.s), f is the frequency of the light, and W is the work function of aluminum (4.2 eV converted to joules is 6.73 x 10^-19 J).

First, we need to find the frequency of the light using the formula:

c = fλ

where c is the speed of light (3 x 10^8 m/s) and λ is the wavelength of the light (200 nm or 2 x 10^-7 m).

Rearranging the formula, we get:

f = c/λ

f = (3 x 10^8)/(2 x 10^-7)

f = 1.5 x 10^15 Hz

Now we can plug in the values and solve for KE:

KE = hf - W

KE = (6.626 x 10^-34)(1.5 x 10^15) - 6.73 x 10^-19

KE = 9.92 x 10^-19 J

Converting this to electron volts (eV), we get:

KE = (9.92 x 10^-19)/(1.602 x 10^-19)

KE = 6.20 eV

Therefore, the kinetic energy of the fastest ejected electrons is 6.20 eV.

(b) To find the kinetic energy of the slowest ejected electrons, we can use the same equation as in part (a), but with a frequency equal to the cutoff frequency for aluminum. This is because electrons with less kinetic energy than the work function cannot be ejected.

(c) The stopping potential is the potential difference between the metal surface and the point where the kinetic energy of the fastest electrons is reduced to zero. We can find this using the equation:

eV_stop = KE_max

where e is the elementary charge (1.602 x 10^-19 C).

Plugging in the values from part (a), we get:

V_stop = KE_max/e

V_stop = 6.20/1.602

V_stop = 3.87 V

Therefore, the stopping potential is 3.87 V.

(d) The cutoff wavelength for aluminum can be found using the formula:

λ_cutoff = hc/W

where W is the work function of aluminum.

Plugging in the values, we get:

λ_cutoff = hc/W

λ_cutoff = [(6.626 x 10^-34)(3 x 10^8)]/6.73 x 10^-19

λ_cutoff = 2.92 x 10^-7 m

Converting this to nanometers, we get:

λ_cutoff = 292 nm

Therefore, the cutoff wavelength for aluminum is 292 nm.

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Answer:

3.125×10²¹ N/C

Explanation:

Electric Field: This can be defined as the force experienced per unit charge. The S.I unit of electric Field is N/C

Applying,

E = F/q.................. Equation 1

Where E = Electric Field, F = Force experienced, q = Charge of an electron.

From the question,

Given: F = 500 N, q = 1.6×10⁻¹⁹ C

Substitute these values into equation 1

E = 500/(1.6×10⁻¹⁹)

E = 312.5×10¹⁹

E = 3.125×10²¹ N/C

Considering the definition of speed, the speed of the shuttlecock is 250 \(\frac{cm}{s}\).

You have to know that speed ​​is a quantity that expresses the relationship between the space traveled by an object. That is, the speed is associated with the change of position of an object in space within a certain amount of time.

The speed can be calculated using the expression:

\(speed=\frac{displacement}{time}\)

In this case, you know that:

Replacing in the definition of speed:

\(speed=\frac{750 cm}{3 s}\)

Solving:

speed= 250 \(\frac{cm}{s}\)

In summary, the speed of the shuttlecock is 250 \(\frac{cm}{s}\).

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Answer:

if positioned at height

Explanation:

just search it online

Answer: 1st, 4th, and 6th choice

A bow is drawn back from its equilibrium position.

A spring toy dart gun is loaded with a dart.

A bungee cord is stretched with a person at the end.

Explanation:

If these are the choices...

A bow is drawn back from its equilibrium position.

An arrow rests on a bow.

A spring toy dart gun is unloaded.

A spring toy dart gun is loaded with a dart.

A bungee cord is connected to a tall tower.

A bungee cord is stretched with a person at the end.

Edge 2021

Answer:

The police car is moving at 41.24 m/s.

Explanation:

To find the speed of the police car we need to use the Doppler equation:

\( f = f_{0}(\frac{v + v_{r}}{v + v_{s}}) \)      

Where:

v: is the speed of the sound = 343 m/s

\(v_{r}\): is the speed of the receiver = 12 m/s

\(v_{s}\): is the speed of the source =?

f: is the observed frequency = 959 Hz

f₀: is the emitted frequency = 1038 Hz          

Both terms are positive in the fraction because the velocity of the sound is in the opposite direction to both velocities of the police car and the other car.  

By solving the above equation for \(v_{s}\) we have:        

\( v_{s} = \frac{f_{0}(v + v_{r})}{f} - v = \frac{1038(343 + 12)}{959} - 343 = 41.24 m/s \)  

Therefore, the police car is moving at 41.24 m/s.

I hope it helps you!                  

The specific volume of the water with a density of 1000 kg/m^3 is: 0.001 m^3/kg

The specific volume formula and the procedure we will use is:

v = 1/ρ

Where:

Information about the problem:

Applying the specific volume formula we get:

v = 1/ρ

v = 1/1000 kg/m^3

v = 0.001 m^3/kg

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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Answer:

KE = ½mv² = ½(0.155)(31.4)² = 76.4 J

Explanation:

The kinetic energy (KE) of the  0.155 kg arrow when it leaves the bow is 76.4 joule.

Kinetic energy is a type of power that a moving object or particle possesses. An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force.

A moving object or particle has kinetic energy, which depends on both its mass and its rate of motion.

Given parameters:

Mass of the arrow: m = 0.155 kg.

Upward velocity of the arrow: v = 31.4 m/s.

Hence, The kinetic energy (KE) of the arrow = 1/2 × mass × velocity²

= 1/2 × 0.155 × 31.4 joule

= 76.4 joule.

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