What is the energy source that heats a contracting protostar?

Explanation:

Given that,

Potential difference, V = 412 V

Magnitude of magnetic field, B = 188 mT

(a) The potential energy of electron is balanced by its kinetic energy as :

[tex]eV=\dfrac{1}{2}mv^2[/tex]

v is speed of the electron

[tex]v=\sqrt{\dfrac{2eV}{m}} \\\\v=\sqrt{\dfrac{2\times 1.6\times 10^{-19}\times 412}{9.1\times 10^{-31}}} \\\\v=1.2\times 10^7\ m/s[/tex]

(b) When the charged particle moves in magnetic field, it will move in circular path. The radius of the circular path is given by :

[tex]r=\dfrac{mv}{eB}\\\\r=\dfrac{9.1\times 10^{-31}\times 1.2\times 10^7}{1.6\times 10^{-19}\times 188\times 10^{-3}}\\\\r=3.63\times 10^{-4}\ m[/tex]

Hence, this is the required solution.                                

1.) The atomic radius of the elements in a group or family increase from the top to the bottom.

2.) The ionization energy decrease going down from the top to the bottom of the group.

3.) Electron affinity becomes less negative from the top to the bottom

4.) Element with high ionization energy has high electronegativity. Therefore, electronegativity decreases from top to the bottom of the group.

Periodic table tells us of the arrangement of elements and also the periodic properties of the elements as they are arranged in groups, periods and families.

some of the properties are :

1. Atomic radius

2. Ionization Energy

3. Electron Affinity

4. Electronegativity

5. Metallic character

6. e.tc

1.) The atomic radius of the elements in a group or family increase from the top to the bottom.

2.) The ionization energy decrease going down from the top to the bottom of the group.

3.) Electron affinity becomes less negative from the top to the bottom

4.) Element with high ionization energy has high electronegativity. Therefore, electronegativity decreases from top to the bottom of the group.

Due to the reason mention above, i can conclude the mystery elements are at the top of their families on the periodic table. An element that is in the same family as element C is likely to have all properties mentioned above.

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Answer:

(a) 534.324 rad

(b) 13.45 s

(c) -6.45 rad/s2

Explanation: Please see the attachments below

Final answer:

The grinding wheel's total angle of turn, time to stop, and angular acceleration are calculated using its initial angular velocity, time accelerated, and the angle it turned while coasting.

Explanation:

Calculating Angular Motion of a Grinding Wheel

A grinding wheel starts with an angular velocity of 28.0 rad/s and accelerates for 1.90 s at a constant angular acceleration of 25.0 rad/s2. After a circuit breaker trips, it coasts to a stop through 436 rad.

To find the total angle the wheel turns, calculate the angle turned during the acceleration phase and add the 436 rad it turns while coasting.

The time for the wheel to stop is found by calculating the time from start to when the circuit breaker trips plus the time it takes to coast to a stop.

The angular acceleration during the deceleration phase is determined using the kinematic equations of rotational motion.

Answer:

The magnitude of the acceleration of the stone is 19.87 m/s²

Explanation:

Given;

mass of stone, m = 375 g = 0.375 kg

moment of inertia, I = 0.0125 kg.m²

radius of the pulley, r = 26 cm = 0.26 m

Torque generated by the pulley on the stone is given as;

τ = F x r = Iα

where;

F is applied force on the stone due to its weight

r is the radius of the pulley

I is moment of inertia

α is angular acceleration (rad/s²)

Force, F = mg = 0.375 x 9.8 = 3.675 N

Torque, τ = F x r

τ = 3.675 x 0.26

τ = 0.9555 N.m

τ = Iα

Angular acceleration, α = τ / I

α = 0.9555 / 0.0125

α = 76.44 rad/s²

Finally, determine linear acceleration, a,  in m/s²

a = αr

a = 76.44 x 0.26

a = 19.87 m/s²

Therefore, the magnitude of the acceleration of the stone is 19.87 m/s²

The stone's acceleration, calculated using Newton's second law for rotational and linear systems, and the relationship between linear and angular acceleration for a non-slip condition, is 3.53 m/s².

To determine the magnitude of the acceleration of the stone, we need to apply Newton's second law for rotational and linear systems. Specifically, we should set up equations for torque and force.

1. Sum of forces in the vertical direction (y-axis): T - mg = ma, where T is the tension in the string, m is the mass of the stone (0.375 kg), g is the acceleration due to gravity (9.81 m/s²), and a is the linear acceleration of the stone.

2. Sum of torques about the pulley's axis: τ = Iα, where I is the moment of inertia of the pulley (0.0125 kg · m²), α is the angular acceleration, and τ is the torque due to the tension (T·r, with r being the radius of the pulley).

Because the string unwinds without slipping, we have a relationship between linear and angular acceleration: a = αr.

Combining the equations, we can solve for the acceleration 'a' of the stone:

T = Iα/r = Ia/r²

So, T - mg = ma becomes:

Ia/r² - mg = ma

And by solving for 'a', we get:

a = ​(mg)/(m + I/r²)

Substituting the given values:

a = (0.375 kg × 9.81 m/s²)/(0.375 kg + 0.0125 kg m²/ (0.26 m)²) = 3.53 m/s²

Thus, the stone's acceleration is 3.53 m/s².

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Answer:

A C and D

Explanation:

Answer:

A C D

Explanation:

Coulomb's law and the universal law of gravity both have inverse-square relationships, involve a proportionality constant, and describe forces between two objects.

The factors that Coulomb's law and the universal law of gravity have in common are:

Answer:

(A) Frictional force will be equal to 27.92 N

(B) Mass is equal to 33120 kg

Explanation:

(A) Diameter of nozzle d = 2.20 cm

So radius [tex]r=\frac{d}{2}=\frac{2.20}{2}=1.10cm[/tex]

eight h = 7.5 m

Density of water [tex]\rho =1000kg/m^3[/tex]

Acceleration due to gravity [tex]g=9.8m/sec^2[/tex]

Pressure on the rubber stopper

[tex]P=\rho hg[/tex]

[tex]p=1000\times 7.5\times 9.8=73500Pa[/tex]

Area of cross section [tex]A=\pi r^2[/tex]

[tex]A=3.14\times 0.01^2=3.799\times 10^{-4}m^2[/tex]

So force [tex]F=PA[/tex]

[tex]F=73500\times 3.799\times 10^{-4}=27.92N[/tex]

(B) Speed of the water through nozzle

[tex]v=\sqrt{2gh}[/tex]

[tex]=\sqrt{2\times 9.8\times 7.5}=12.12m/sec[/tex]

Volume of water flow

[tex]V=vA=12.12\times 3.799\times 10^{-4}=0.0046m^3/sec[/tex]

Mass of water flow per sec

[tex]m=\rho V=1000\times 0.0046=4.6kg[/tex]

Total time t = 2 hour = 2×3600 = 7200 sec

So total mass flow

[tex]m=4.6\times 7200=33120kg[/tex]

To calculate the friction force exerted on the stopper by the nozzle, use Bernoulli's equation for fluid flow. To calculate the mass of water that flows from the nozzle, use the equation Q = A * V.

To calculate the friction force exerted on the stopper by the nozzle, we can use Bernoulli's equation for fluid flow. The pressure at the top of the tank is atmospheric pressure, and the pressure at the nozzle is also atmospheric pressure. The friction force can be calculated by the equation F = P * A, where P is the pressure difference and A is the cross-sectional area of the stopper.

To calculate the mass of water that flows from the nozzle in 2.00 hours, we can use the equation Q = A * V, where Q is the volumetric flow rate, A is the cross-sectional area of the nozzle, and V is the velocity of the water.

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Answer:

Store chemical energy and transfer it to electrical energy when a circuit is connected.

Explanation:

A battery (single cell) is a container made of one cell that can produce a particular amount of electrical energy when needed.

It works by converting chemical energy to electric energy which is then used as a power source.

It stores up chemical energy and when connected to an external circuit, it provides electrical energy (through the flow of electrical current) to the circuit.

A battery is usually made up of a positive electrode and a negative electrode.

Final answer:

To determine the speed of an object attached to a horizontally lying spring on a frictionless surface at a specific stretch, we apply the law of conservation of energy and calculate the distribution of potential and kinetic energy at that point.

Explanation:

The subject of this question is Physics, and it involves a concept known as simple harmonic motion(SHM). To find the speed of the object at the instant when the spring is stretched by 0.041 m relative to its unstrained length, we can use the law of conservation of energy. In SHM, the total mechanical energy (sum of potential and kinetic energy) is conserved if there is no energy loss due to friction or other non-conservative forces.

At the compressed position (0.080 m from equilibrium), all the energy is potential, given by Ep = 1/2 k x2, where k is the spring constant and x is the displacement from equilibrium. At the position where the spring is stretched by 0.041 m, the energy will be partly potential and partly kinetic. The potential energy at this point is Ep = 1/2 k (0.041 m)2 and the kinetic energy is Ek = 1/2 m v2, where m is the mass and v is the velocity of the object.

Conservation of energy gives us:

1/2 k (0.080 m)2 = 1/2 k (0.041 m)2 + 1/2 m v2.

We can solve this equation for v, the speed at 0.041 m stretch, knowing the values of k, m, and x.

Answer:

Shares electrons

Answer:

The majority component is the solvent so In the air nitrogen is found more.

So Nitrogen is the solvent in air.

Answer:

[tex]\Delta V=\frac{Q d}{A \epsilon_0}[/tex]

Explanation:

for the calculation of the electric potential inside a parallel plate capacitor you can use the formula for the electric field inside the capacitor.

[tex]\Delta V=V(d)-V(0)=\int_0^dEdx[/tex]

where d is the distance between plates and E is the electric field, which is given by:

[tex]E=\frac{\sigma}{\epsilon_0}[/tex]

By replacing you obtain:

[tex]\Delta V=E\int_0^ddx=Ed=\frac{\sigma d}{\epsilon_0}=\frac{Qd}{A\epsilon_0}[/tex]

where Q is the charge stored by the capacitor and A is the area of the plates.

hence, the answer is Qd/Ae0

The electric potential inside a parallel-plate capacitor is directly proportional to the amount of charge on the capacitor.

The electric potential inside a parallel-plate capacitor is directly proportional to the amount of charge on the capacitor. The magnitude of the electrical field between the plates is directly proportional to the charge, which means that the electric potential is also directly proportional to the charge.

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Answer:

Frequency, f = 59.6 kHz

Explanation:

Given that,

Speed of sound, v = 340 m/s

The bat can detect an insect that is 0.0057 m long, [tex]\lambda=0.0057\ m[/tex]

We need to find the minimum frequency of sound waves required for a bat to detect an insect. The speed of a wave is given by :

[tex]v=f\lambda\\\\f=\dfrac{v}{\lambda}\\\\f=\dfrac{340\ m/s}{0.0057\ m}\\\\f=59649.12\ Hz[/tex]

or

f = 59.6 kHz

So, the frequency detected by the bat is 59.6 kHz.

The minimum required frequency of the sound wave is 59.65 kHz

Given information:

speed of sound, v = 340 m/s

the wavelength of insect that the bat can detect, λ = 0.0057 m

The wavelength, frequency, and speed are related as follows:

v = fλ

The minimum frequency of sound wave required is:

f = v/λ

where f is the frequency of the sound

f = 340/0.0057 s⁻¹

f = 59649 Hz

or,

f = 59.65 kHz

So the frequency comes out to be 59.65 kHz

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Answer:

[tex]E_n = \frac{kQ}{2} = 2E[/tex]

If the charge is doubled, the electric field is also doubled.

Explanation:

Electric field due to the negative charge is given as:

[tex]E = \frac{kQ}{r^2}[/tex]

where k = Coulomb's constant

Q = electric charge

r = distance between charge and point of consideration

At 2 m from the negative charge, the magnitude of the Electric field due to a negative charge -Q is given as E:

[tex]E = |\frac{-kQ}{2^2}| \\\\\\E = \frac{kQ}{4}[/tex]

If the charge is doubled, the new charge becomes -2Q and the new electric field becomes:

[tex]E_n = |\frac{-2kQ}{4}| \\\\\\E_n = |\frac{-kQ}{2}|[/tex]

[tex]E_n = \frac{kQ}{2} = 2E[/tex]

If the charge is doubled, the electric field is also doubled.

Answer:

E'=(1/4)E

Explanation:

The magnitude of the electric force is given by:

[tex]E=k\frac{q}{r^2}[/tex]

where k is the Coulomb constant (8.89*10^{9}Nm^2/C^2).

When the distance is r=2m we have:

[tex]E=k\frac{q}{(2m)^2}=k\frac{q}{4m^2}[/tex]

when the distance is doubled we obtain:

[tex]E'=k\frac{q}{(4m)^2}=k\frac{q}{16m^2}=\frac{1}{4}k\frac{q}{4m^2}=\frac{1}{4}E[/tex]

Hence, the new electric field is a quarter of the first electric field.

hope this helps!

Answer: C) Both A and B

Explanation:

The ABS system is disabled when the ABS yellow warning lamp is on. And when the warning lamp is on the base brake system will work normally but without ABS function

And if the yellow warning lamp is illuminated indicating a fault in the electronic brake control system, you should retrieve the diagnostic trouble codes and follow the procedure listed in the service information. Once the fault has been corrected, clear the diagnostic code and verify that it does not reset

Answer:

3.528×10⁻⁸ V.

Explanation:

Electric Potential: This can be defined as the work done in an electric field in moving a unit charge from infinity to any point. The S.I unit of electric potential is Volt (V) or J/C.

From the question,

V = Fd................ Equation 1

Where V = Electric Potential, F = force experienced by the charge, d = distance.

Given: F = 3.6×10⁻⁴ N, d = 9.8×10⁻⁵ m.

Substitute into equation 1

V = 3.6×10⁻⁴( 9.8×10⁻⁵)

V = 3.528×10⁻⁸ V.

The most prevalent in the human body by mass is oxygen.

To find the answer, we need to know more about the elemental composition in human body.

Thus, we can conclude that, the most prevalent in the human body by mass is oxygen.

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Answer:B I think

Explanation:

Answer:

Block A

Explanation:

Block A will float higher in the water compared to the second Block.

The density of water is 1g/cm³.

According to the principle of floatation "an object that floats in a liquid will displace equal amount of fluid to the weight of the object".

A body will become more submerged in water if it has more density because density is the mass per volume of  body.

An object with a higher density than another will sink in the liquid of the one with lesser density.

Wavelength = speed / frequency

(345 m/s) / (20,000 Hz) = 0.017 m

Formula to solve for the wavelength: w = s/f

w = wavelength

s = speed

f = frequency

Solve using the given values.

w = 345/20000

w = 0.01725

Round if necessary.

0.0173

Therefore, the wavelength is approximately 0.0173 meters.

Best of Luck!

Answer:

They will come back at the same time.

Explanation:

The angular velocity equation of ω[tex]= \frac{V}{r}[/tex] where ω is the frequency of the movement, dependent on the angle. But since swings are simple pendulums and their angles of 8 and 4 degrees are small, they will come back to their starting points at the same time.

I hope this answer helps.

Answer:

The bodies will not come back to their starting point at he same time.

Explanation:

Since they are both pulled back at an angle to the vertical, there is a tangential component of acceleration a = gsinθ

When θ = 4 , a = 9.8sin4 = 0.684 m/s²

When θ = 8 , a = 9.8sin8 = 1.364 m/s²

Using s = ut + 1/2at². Where s is the distance covered and t = time taken, u = initial speed = 0 (assumed since they are both released at the same time)

So s = 0 × t + 1/2at² = 1/2at²

s = 1/2at²

t = √2s/a. Now, since s is the same for both swings, it follows that

t ∝ 1/a. Since their accelerations are different, the bodies will not come back to their starting point at he same time.

Answer: Technician B is right.

Explanation:

Evacuation process is used in refrigeration systems to remove moisture, air and non-profit condensable gases in order to achieve maximum function of the system.

vacuum pump is used to draw the sealed AC system into a vacuum. Evacuation of a refrigerant system also helps to maintain pressure, this is so as pulling a vacuum on the system is simply removing matter (mostly air and nitrogen) from inside the system so that the pressure inside drops below atmospheric pressure.

Answer:

a white dwarf

Explanation:

A white dwarf, is otherwise known as a degenerate dwarf, it is a stellar core remnant which is mostly composed of electron-degenerate matter. A white dwarf is very dense, and has a mass which is comparable to that of the Sun, while its volume is comparable to that of Earth. It faint luminosity comes from the emission of stored heat energy; and no fusion takes place in a white dwarf

In 10 billion years, the solar system would be unrecognisable. The Sun would have become a white dwarf after expanding as a red giant.

If you returned to the solar system in 10 billion years, you'd likely find a vastly different environment from today. Given the current understanding of stellar evolution, the Sun, which is currently a main-sequence star, would have exited this phase. After going through a red giant phase, where it would have engulfed the inner planets, the Sun would have lost most of its outer material, leaving behind a white dwarf. This white dwarf would eventually cool and fade over time, becoming a black dwarf. Surrounding planetary bodies might be destroyed, transformed, or ejected from the solar system altogether due to the Sun's changes and the gravitational influences of other celestial bodies over such a vast period.

In this older universe, new star systems may have formed within the Milky Way from the abundant materials available in the galaxy. However, it's challenging to predict the exact state of the solar system due to numerous factors including potential asteroid impacts, close encounters with passing stars, or even interactions with interstellar objects. One thing is certain: the solar system as we know it will have undergone significant changes.

Answer:

Lightning strikes the empire state building at an average of about 23 times a year.

Explanation:

The Empire State Building is one of the tallest buildings in New York. Because of how high it stretches up into the sky, lightning strikes are quite common to it. This is because part of the building touches the clouds which are usually charged during thunder storms.

According to weather reports, and the Empire State Building website, lightning strikes the empire state building about 23 times a year on the average.

Answer:

The outer shell electrons in metals are free to move from atom to atln

Explanation:

Answer:

Jupiter and Mars.

The asteroid belt is located between those two celestial objects.

:)

Answer: Light and thermal (heat) energy.

Explanation: Flames give off heat and light.

Answer:

Light and thermal (heat) energy are the two kinds of energy associated with flames

Explanation:

Answer:

becuase it is big

Explanation:

Answer:

402 nm

Explanation:

First, we find the speed of light in this medium:

v = 0.701 * c

v = 0.701 * 3 * 10^8

v = 2.103 * 10^8 m/s

Speed of a wave is given as the product of wavelength and frequency:

v = λf

Where λ = wavelength

Wavelength, λ, becomes:

λ = v/f

The frequency of the light is 5.23 * 10^14 Hz, therefore, wavelength will be:

λ = (2.103 * 10^8) / (5.23 * 10^14)

λ = 4.02 * 10^(-7) m = 402 nm

The wavelength of the light is 402 nm.

Answer:

2 The electric field strength is greatest where the equipotential lines are very close to each other.

Explanation:

Equipotential lines are  contour lines which trace the lines of identical altitudes. In physics, they trace out lines of equal electric potential or voltage.

Equipotential lines are always perpendicular to the electric field. The closer the equipotential lines to each other, the greater the strength of the electric field.

Option (E) is correct

Neither (they arrive together)

Explanation:

Neither of the cylinders gets to the bottom first, they both will arrive together. Every object can gain speed with time if it is pushed, it is called the acceleration of that object. It the acceleration that decides which object reaches the bottom first.

Acceleration = I / mr^2.

In the case of both the cylinders, the acceleration will be the same, with the same acceleration they will reach the bottom at the same time.