During which change of state do atoms lose energy?
sublimation
freezing
boiling
melting

Answer:

\(31.7\:\mathrm{N}\)

Explanation:

We can use basic trig in a right triangle to solve this problem. Let the x component of the force be \(x\). We have the following equation:

\(\cos 24^{\circ}=\frac{x}{34.7},\\x=34.7\cos 24^{\circ}\approx \boxed{31.7}\)

Nο light is transmitted by the twο-sheet system when the pοlarizing directiοns οf the sheets are at angles οf 90° tο each οther.

The Gοοgle Sheets οnline spreadsheet applicatiοn enables users tο create, edit and fοrmat spreadsheets οnline tο οrganize and analyze infοrmatiοn. Gοοgle Sheets is οften cοmpared tο Micrοsοft Excel, as bοth applicatiοns are used fοr similar purpοses.

Tο determine the intensity οf the light transmitted by the twο-sheet system, we need tο cοnsider the effect οf each pοlarizing sheet οn the intensity οf the incident light.

Let's assume the intensity οf the incident light is I0.

The first pοlarizing sheet has its pοlarizing directiοn at an angle θ1 tο the y-axis. The intensity οf the light transmitted by the first sheet can be calculated using Malus's law:

I1 = I0 * cοs²(θ1)

The secοnd pοlarizing sheet has its pοlarizing directiοn at an angle θ2 = 90° tο the y-axis. The intensity οf the light transmitted by the secοnd sheet can alsο be calculated using Malus's law:

I2 = I1 * cοs²(θ2)

Since cοs(90°) = 0, the secοnd pοlarizing sheet will blοck all the light transmitted by the first sheet. Therefοre, the intensity οf the light transmitted by the twο-sheet system is:

I_transmitted = I2 = 0

In οther wοrds, nο light is transmitted by the twο-sheet system when the pοlarizing directiοns οf the sheets are at angles οf 90° tο each οther.

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The correct explanation for the movement of the compass needle when the direction of the voltage on the battery is switched is (C) The current in the wire produced a magnetic field.

Voltage, also known as electric potential difference, is a measure of the electric potential energy per unit of charge in an electrical circuit. It is the force that drives the flow of electric charge in a circuit. Voltage is usually measured in volts (V) and is represented by the symbol "V".

When an electric current flows through a wire, it creates a magnetic field around the wire. The direction of the magnetic field depends on the direction of the current flow.

This magnetic field interacts with the Earth's magnetic field and causes the compass needle to move. Therefore, as the direction of the current in the wire changes when the voltage on the battery is switched, the direction of the magnetic field around the wire also changes, causing the compass needle to move.

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Answer:

diminished and erect( upright)

Explanation:

Answer:

The speed of a wave (v) is equal to the product of its wavelength (λ) and frequency (f), i.e., v = λf. Rearranging this equation, we get:

λ = v/f

Substituting the given values, we get:

λ = 2.3 m/s / 5 Hz

λ = 0.46 meters

Therefore, the wavelength of the water wave is 0.46 meters.

Explanation:

Answer:

The wavelength is 0.46 meters.

Explanation:

The speed of a wave is given by the formula:

v = λf

where v is the wave speed, λ is the wavelength, and f is the frequency.

We are given v = 2.3 m/s and f = 5 Hz. Rearranging the formula above to solve for λ, we get:

λ = v/f

Substituting the given values, we get:

λ = 2.3 m/s / 5 Hz = 0.46 m

Therefore, the wavelength of the water wave is 0.46 meters.

The impulse exerted by the floor on the egg is -0.45 kg·m/s.

The impulse exerted on an object can be calculated using the equation I = Δp, where I is the impulse and Δp is the change in momentum of the object. The change in momentum can be determined using the equation Δp = mΔv, where m is the mass of the object and Δv is the change in velocity.

In this case, the egg falls from a height of 90 cm, so it experiences a change in velocity as it falls. Using the equation v = √(2gh), where v is the final velocity, g is the acceleration due to gravity (approximately 9.8 m/s²), and h is the height, we can calculate the final velocity of the egg upon hitting the floor.

Next, we calculate the initial momentum of the egg using the equation p = mv, where p is the momentum, m is the mass of the egg (5.0 g = 0.005 kg), and v is the initial velocity (0 m/s).

Finally, we subtract the initial momentum from the final momentum to obtain the change in momentum and therefore the impulse exerted by the floor on the egg, which is approximately -0.45 kg·m/s.

The negative sign indicates that the impulse is in the opposite direction to the initial momentum, representing the reversal of motion upon impact with the floor.

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If the frequency of the incident light on a metal surface is increased while keeping the intensity and temperature constant, the kinetic energy of the emitted electrons will increase.

The photoelectric effect states that when light of sufficient frequency (above the threshold frequency) strikes a metal surface, electrons are emitted. The energy of a photon is given by the equation E = hf, where E is the energy, h is Planck's constant, and f is the frequency of the light.

The energy of the emitted electron is equal to the energy of the incident photon minus the work function of the metal (Φ), which represents the energy required to remove an electron from the metal surface. So, the equation becomes E = hf - Φ.

As the frequency of the incident light increases, the energy of each photon increases. Therefore, the kinetic energy of the emitted electrons will increase as well.

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Cloud-to-cloud lightning makes up 60 % of all lightning.

Cloud-to-cloud lightning is a type of lightning that occurs within a single thunderstorm cloud, between two different thunderstorm clouds or between a thunderstorm cloud and the air near the ground. It is also known as intra-cloud lightning.

This type of lightning is responsible for creating the beautiful light shows that we often see during thunderstorms, but it can also be dangerous and cause damage to electrical equipment.
In terms of its frequency compared to other types of lightning, cloud-to-cloud lightning makes up a significant portion of all lightning strikes.

However, it is difficult to determine an exact percentage because lightning is a complex and unpredictable phenomenon. Studies have shown that cloud-to-cloud lightning accounts for around 60% of all lightning strikes worldwide.
This high percentage can be attributed to the fact that thunderstorm clouds often contain multiple charged regions, which can create the conditions necessary for cloud-to-cloud lightning.

While cloud-to-cloud lightning may not be the most well-known type of lightning, it plays an important role in the overall frequency and impact of lightning strikes worldwide.

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The missing value in the table is the wavelength of the sound wave, which is calculated to be 6.3 meters using the formula wavelength = wave speed / frequency. so, the correct option is A).

The given problem provides the speed and frequency of a sound wave and asks to find the missing value of the wavelength.

Using the formula for wavelength,

λ = v/f

In this case, the frequency was 55Hz and the speed of the wave was 346m/s.

λ = 346 m/s / 55 Hz

λ = 6.3 m

the missing value was calculated to be 6.3 meters. The wavelength is the distance between adjacent crests or troughs of a wave and is the reciprocal of the frequency. so, the correct answer is A).

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--The given question is incomplete, the complete question is given

" A sound wave generated by musical note has the characteristics presented in the table. What is the missing value

A 6.3

B 4.7

C 7.5

D 5.6 "--

The potential energy of the car when it let go is 20,000 J.

The speed of the car at the bottom of the ramp is 20 m/s.

The given parameters;

The potential energy of the car is calculated as follows;

P.E = mgh

P.E = 100 x 10 x 20

P.E = 20,000 J

The speed of the car at the bottom of the ramp is calculated as follows;

\(K.E = P.E\\\\\frac{1}{2} mv^2 = mgh\\\\v^2 = 2gh\\\\v = \sqrt{2gh} \\\\v = \sqrt{2 \times 10 \times 20} \\\\v = 20 \ m/s\)

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The main difference when analyzing heat addition/removal during a phase change vs not in a phase change involves the processes of latent heat and specific heat capacity.

During a phase change, heat energy is used to change the substance's phase (e.g., solid to liquid or liquid to gas) without changing its temperature. This is due to the latent heat of the substance, which is the energy required for the phase change to occur.

In this case, the heat transfer is calculated using the formula Q = m * L, where Q is the heat transferred, m is the mass of the substance, and L is the latent heat of the phase change.

When there is no phase change, heat addition/removal causes a temperature change in the substance. This is due to the specific heat capacity of the substance, which is the amount of heat required to change the temperature of 1 kg of the substance by 1 degree Celsius.

In this case, the heat transfer is calculated using the formula Q = m * c * ΔT, where Q is the heat transferred, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.

In summary, the main difference in analyzing heat addition/removal during a phase change vs not in a phase change involves considering latent heat for phase changes and specific heat capacity for temperature changes.

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Answer:

b

Explanation:

Answer:

B

Explanation:

Physics is the study of matter, energy and the interactions between them. So, all the answers are true.

Energy is defined as the measurement of ability to do work.

Here,

Energy is the measurement of ability do work, which is a physical property of matter. Energy is of various types such as kinetic energy, potential energy,  thermal energy, electrical energy, heat energy, etc. Energy and its applications are associated with many laws. The study of energy and the laws associated with them is one of the main branch of physics.

Matter is defined as the substance that has a specific mass and occupies physical space. Atomic particles such as electrons, protons and others are material particles. Thus the study of these matter and material particles is an important branch of physics.

Matter and energy in nature interacts in many ways. Material particles moving moving with particular kinetic energy is an example of matter-energy interactions. These interactions and their studies comes under physics.

Hence,

Physics is the study of matter, energy and the interactions between them. So, all the answers are true.

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Answer:

6m/s^2

Explanation:

Acceleration is the change in speed/Velocity per unit time. That means the speed divided by the time. 24m/s divided by 4s=6m/s^2

Answer:

The potential energy (P.E) at the top is 392 J

The kinetic energy (K.E) at the top is 0 J

The potential energy (P.E) at the halfway point is 196 J.

The kinetic energy (K.E) at the halfway point is 196 J.

Explanation:

Given;

mass of the rock, m = 2 kg

height of the cliff, h = 20 m

speed of the rock at the halfway point, v = 14 m/s

The potential energy (P.E) and kinetic energy (K.E) when its at the top;

P.E = mgh

P.E = (2)(9.8)(20)

P.E= 392 J

K.E = ¹/₂mv²

where;

v is velocity of the rock at the top of the cliff = 0

K.E = ¹/₂(2)(0)²

K.E = 0

The potential energy (P.E) and kinetic energy (K.E) at the halfway point;

P.E = mg(¹/₂h)

P.E = (2)(9.8)(¹/₂ x 20)

P.E = 196 J

K.E = ¹/₂mv²

where;

v is velocity of the rock at the halfway point = 14 m/s

K.E = ¹/₂(2)(14)²

K.E = 196 J.

The potential energy (P.E) at the top is 392 J

The kinetic energy (K.E) at the top is 0 J

The potential energy (P.E) at the halfway point is 196 J.

The kinetic energy (K.E) at the halfway point is 196 J.

Since

mass of the rock, m = 2 kg

height of the cliff, h = 20 m

speed of the rock at the halfway point, v = 14 m/s

We know that

P.E = mgh

P.E = (2)(9.8)(20)

P.E= 392 J

Now

K.E = ¹/₂mv²

here.

v is velocity of the rock = 0

K.E = ¹/₂(2)(0)²

K.E = 0

Now

The potential energy (P.E) and kinetic energy (K.E) at the halfway point;

P.E = mg(¹/₂h)

P.E = (2)(9.8)(¹/₂ x 20)

P.E = 196 J

K.E = ¹/₂mv²

Here,

v is the velocity of the rock= 14 m/s

K.E = ¹/₂(2)(14)²

K.E = 196 J.

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Answer: It’s 98,000

Explanation: Just did it on apex

Respuesta: T2 = 131.04K

Explicación: Dado lo siguiente:

Presión, P1 = 1.5 atm = 1.5 × 760 = 1140 mmHg

Presión, P2 = 1.2 atm = 1.2 × 760 = 912 mmHg

Volumen, V1 = 500cm3 Volumen, V2 = 300cm3

Temperatura, T1 = 273K Temperatura, T2 =?

Usando la fórmula de gas combinada:

P1V1 / T1 = P2V2 / T2

Ingresando nuestros valores:

(1140 × 500) / 273 = (912 × 300) / T2

T2 × (1140 × 500) = 912 × 300 × 273

T2 = 74692800/570000 T2 = 131.04K

Answer: Executive Order on Protecting American Monuments, Memorials, and Statues against our country are public monuments, memorials, and statues.

Explanation: learned it last week

The purpose of the focusing cup in an electron gun is to D: keep the electrons together.

The focusing cup is an electrode that is positioned near the filament and is negatively charged. It creates an electric field that converges the electrons emitted from the filament, directing them into a tight beam. This helps to maintain the electrons' energy and direction, which is important for applications such as electron microscopy, where a focused beam of electrons is required to produce high-resolution images.

By keeping the electrons together, the focusing cup helps to improve the quality of the electron beam, making it more useful for various applications.

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Answer:

Electrons move around the nueclues and the proton and neutron is found inside the nucleus

Answer:

Electron

Electron is one of the sub-atomic particle that revolves around the nucleus.

They are present in orbits which are just like the orbits of planets in the solar system which are the paths of revolution.

Answer:

true

Explanation:

Answer: True

Explanation:

Answer:

-0.08m/s²

Explanation:

Answer:

Explanation:

The new volume can be found by using the formula for Boyle's law which is

\(P_1V_1 = P_2V_2\)

Since we are finding the new volume

\(V_2 = \frac{P_1V_1}{P_2} \\\)

From the question we have

\(V_2 = \frac{5 \times 90000}{145000} = \frac{450000}{145000} = \frac{450}{145} \\ = 3.103448...\)

We have the final answer as

Hope this helps you

The instrument used to measure blood pressure in this experiment is likely a sphygmomanometer.

A sphygmomanometer is a device used to measure blood pressure, and it typically consists of an inflatable cuff to temporarily occlude the artery, a pressure gauge to measure the pressure in the cuff, and a stethoscope or other sound-detecting device to detect the sounds of blood flow through the artery.

Mean arterial pressure (MAP) is a calculated value that takes into account the systolic and diastolic pressures, and it is not measured directly with an instrument. MAP is typically calculated using the equation MAP = (2/3) * diastolic pressure + (1/3) * systolic pressure.

ECG (electrocardiogram) is a test that measures the electrical activity of the heart and is used to diagnose various heart conditions, but it is not used to measure blood pressure.

MRI (magnetic resonance imaging) is a medical imaging technique that uses a magnetic field and radio waves to create detailed images of the body's internal structures, and it is not used to measure blood pressure.

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Answer:

I would say temperature

The value of ΔHvap for the liquid in units of kJ/mol is 12.31 kJ/mol.

Explanation:

The slope in a plot of ln Pvap vs (1/T) for an unknown liquid is found to be -1,479.

What is the value of ΔHvap for the liquid in units of kJ/mol?

In order to calculate ΔHvap for the liquid, the Clausius-Clapeyron equation may be used.ΔHvap = -R × slopeWhere,ΔHvap = Heat of vaporization R = Gas constant T = Temperature in Kelvin slope = the slope of ln Pvap vs 1/T plot. The value of R is 8.314 J/(mol K).

Therefore, ΔHvap = - (8.314 J/(mol K)) × (-1,479) Convert J/mol into kJ/mol by dividing the value by 1000.ΔHvap = (8.314 J/(mol K)) × (1,479)/1000= 12.31 kJ/mol Therefore, the value of ΔHvap for the liquid in units of kJ/mol is 12.31 kJ/mol.

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a. The rotational inertia of the rod is 0.0004 kgm²

b. The rotational inertia of a weight is 0.0009025 kgm²

c. The total rotational inertia is 0.002205 kgm²

Rotational inertia is a property of an object which shows its aboility to rotate about an axis.

The rotational inertia of  a rod is given by I = 1/12ML² where

Given that

So, substituting the values of the variables into the equation, we have that

I = 1/12ML²

= 1/12 × 0.030 g × (0.40 cm)²

=  1/12 × 0.030 kg × 0.1600 m²

=  1/12 × 0.0048 kgm²

= 0.0004 kgm²

So, the rotational inertia of the rod is 0.0004 kgm²

The rotational inertia of the weight (as a hoop) is given by I' = 1/2mL' where

Given that

So, substituting the values of the variables into the equation, we have that

I' = 1/2mL'²

= 1/2 × 0.050 g × (0.19 cm)²

= 0.025 kg × 0.0361 m²

= 0.0009025 kgm²

So, the rotational inertia of a weight is 0.0009025 kgm²

The total rotational inertia, I" = rotational inertia of rod + rotational inertia of both weights.

So, I" = I + 2I'

= 0.0004 kgm² + 2 × 0.0009025 kgm²

= 0.0004 kgm² + 0.001805 kgm²

= 0.002205 kgm²

So, the total rotational inertia is 0.002205 kgm²

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Answer:

\(a=12.5\ m/s^2\)

Explanation:

Given that,

The speed of the bucket tied to a rope, v = 5 m/s

The radius of the circle, r =2 m

We need to find the magnitude of the centripetal acceleration of the bucket. The formula for the centripetal acceleration is given by :

\(a=\dfrac{v^2}{r}\\\\a=\dfrac{(5)^2}{2}\\\\a=12.5\ m/s^2\)

So, the centripetal acceleration of the bucket is \(12.5\ m/s^2\).