Why is the United States considered a multiethnic country?
O
A. Because many people in the United States were born in other
countries
O
B. Because many religions are practiced in the United States
O
C. Because many languages are spoken in the United States
O
D. All of the above

Answer:If you bring a negative object near the electroscope, the electrons in the scope will be repelled toward the leaves, balancing the charge. The leaves will move toward each other.

When the negatively-charged rod is brought close to the electroscope, positive charges are attracted to it and negative charges are repelled away from it.

This is called charging by conduction. Figure 2 (c) Charging by Conduction The negatively charged rod touches the knob on the electroscope. The result is a transfer of electrons from the rod to the knob, making the knob, rod, and gold foil all negative, and making the gold foil deflect from the vertical.

Explanation:

Answer:

In both locations pictured here, the hydrosphere is the main agent responsible for eroding or breaking down the geosphere (rocks). Differences in the amount of precipitation each area receives and the state of the water (liquid or solid) where it contacts rocks result in different kinds of erosion and landforms

Explanation:

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The hydrosphere interacts with the geosphere through processes like erosion, weathering, and the formation of landforms.

The hydrosphere, which refers to all of the water on and below the Earth's surface, interacts with the geosphere through various processes. One example is the erosion of land by water, where rivers and streams carry sediment and deposit it in new locations, shaping the Earth's surface. Another example is the weathering of rocks by water, where water seeps into cracks and breaks down rocks over time. Additionally, the hydrosphere and geosphere interact through the formation of landforms such as oceans, lakes, and mountains.

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Answer:

a) 4500 cycles b) 0.0667s c) 6.67s

Explanation:

a) 15 Hz= 15 cycles/ s

   5 mins= 300s

   15 cycles/s * 300s= 4500 cycles

b) Period= 1/ frequency

   Period= 1/ 15 cycles/s

   Period= 0.0667s

c) Period * number of revolutions= time

  0.0667 * 100= 6.67s

Answer: the intensity of sound at a rock concert will be 6.31 × 10^12 time louder than that of a whisper.

Explanation: Given that sound at a rock concert power is 130 dB of intensity l2

a whisper power is 2 dB of intensity l1

Using the formula

130dB - 2dB = 10Log(I2/I1)

128/10 = logI2/I1

12.8 = log (I2/I1)

I2/I1 = 6.31 × 10^12

Therefore, the intensity of sound at a rock concert will be 6.31 × 10^12 time louder than that of a whisper.

The sound at a rock concert is approximately 630,957,344 times louder than a whisper, as decibels (dB) are a logarithmic unit of sound intensity.

To compare the loudness of two sounds, we first need to understand that decibels (dB) are a logarithmic measure of sound intensity. A difference of 10 dB signifies a 10-fold increase in sound intensity. Therefore, the difference between the two sound intensities in this case - the rock concert's 130 dB and the whisper's 2 dB - is 128 dB. To convert this into times louder, we would divide the difference by 10[tex](128/10 = 12.8)[/tex] and then use that result (12.8) as a power of 10. Hence, the amplitude of the sound at a rock concert is approximately 630,957,344 times louder than that of a whisper.

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Answer:

Electric current, I = 4.08 A    

Explanation:

We have,

Power of vacuum cleaner is 500 W

Resistance of vacuum cleaner is 30 ohms

It is required to find the current flowing through the vacuum cleaner. It can be calculated using the definition of power delivered. Its formula is given by :

[tex]P=I^2R[/tex]

I is electric current

[tex]I=\sqrt{\dfrac{P}{R}} \\\\I=\sqrt{\dfrac{500}{30}} \\\\I=4.08\ A[/tex]

So, the electric current flowing through the vacuum cleaner is 4.08 A.

Answer:

A hope this helps

Explanation:

Final answer:

The cork flying off in a straight line after being released exemplifies Newton's first law of motion, which states that an object will continue at a constant velocity unless acted upon by an external force.

Explanation:

The scenario described where a cork flies off in a straight line after being released from circular motion is an example of Newton's first law of motion. This law, also known as the law of inertia, states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. In the case of the cork, once it is no longer constrained by the tension of the string (which provides the centripetal force necessary for circular motion), it continues in a straight line (the tangent to the circle at the point of release) because there's no other force acting on it to change its state of motion.

In contrast, Newton's second law focuses on how the acceleration of an object is related to the forces acting on it and its mass. Newton's third law deals with action-reaction force pairs, stating that for every action there is an equal and opposite reaction. The concept of a fourth law of motion does not exist in Newtonian physics, which includes only three laws of motion.

Answer:

The law of definite proportions states that a given chemical compound always contains the same elements in the exact same proportions by mass.

Explanation:

Answer:

Rubber is an insulator.

Explanation:

Rubber is an insulator. Electricity will always travel "the path of least resistance." Rubber has a very high resistance, so electricity will go somewhere else to find ground.

Answer:

T cell

Explanation:

Answer:

c. 40 N/m

Explanation:

EE = ½ kx²

5 J = ½ k (0.5 m)²

k = 40 N/m

Answer:

A. Light can travel trough air and space.

Explanation:

A vacuum is space that has no air inside of it. Since light is able to go through 'nothing' and matter, your answer must be A.

Answer:

A) Both water and a vacuum

Explanation:

Sound is a mechanical wave that requires a medium such as air or water to travel through. A laser on the other hand can travel through some mediums and vacuum.  

Answer:

A,D,F

Explanation:

The equations that represent the relationship between wavelength and frequency for a sound wave are:

v = lambdaf

A = StartFraction v over f EndFraction.

f = StartFraction v over f EndFraction.

Frequency and wavelength are inversely proportional to every other. The wave with the greatest frequency has the shortest wavelength. two times the frequency manner one-1/2 the wavelength, for this reason, the wavelength ratio is the inverse of the frequency ratio.

In physics, the wavelength is the spatial period of a periodic wave—the space over which the wave's shape repeats. It's far the gap between consecutive corresponding factors of the same phase at the wave, including two adjacent crests, troughs, or zero-crossings, and is a function of each journeying wave and standing waves, as well as other spatial wave styles.

The inverse of the wavelength is called the spatial frequency. Wavelength is normally unique with the aid of the Greek letter lambda (λ). The term wavelength is also every now and then implemented to modulated waves, and to the sinusoidal envelopes of modulated waves or waves shaped via interference of numerous sinusoids.

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Answer:

A.

Explanation:

Answer:

B) Polonium(Po)

Sound is a longitudinal wave, where the particles vibrate back and forth in the direction the wave is moving. It cannot travel in a vacuum as there are no particles to transmit the wave.

Sound is an example of a longitudinal wave. This is because, in a longitudinal wave, the motion of the particles in the wave is in the same direction as the motion of the wave itself. When you speak for example, your voice creates a sound wave which makes the particles in the air vibrate back and forth in the same direction as the sound is traveling. On the contrary, transverse waves have particles that vibrate at a right angle to the direction of the wave, and the propagation of sound is not possible in vacuum (space devoid of matter) as there are no particles to vibrate and transmit the sound wave.

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Answer:

A) Moves closer together

Answer:

The four types of musical instruments are percussion, woodwind, brass, and strings.

Explanation:

Percussion instruments include drums, triangle, cymbals, and xylophones. There are more instruments than what i've mentioned though. Percussion instruments often produce the beat of songs.

Woodwind instruments include clarinets, oboe, flute, and saxophone. Woodwind instruments often produce the harmony of songs and, occasionally, the melody.

Brass instruments include trumpet, trombone, french horn, and tuba. Brass instruments often produce the harmony of songs, the trumpet produces the melody a lot though.

String instruments include guitars, violins, cello, bass, ukulele, and banjo. String instruments produce both the harmony and the melody. These instruments often produce really beautiful music, in my opinion.

The four types of musical instruments are aerophones, chordophones, membranophones, and idiophones.

The four types of musical instruments are:
Aerophones (wind instruments): These instruments create sound by using air as the main component. Examples include flute, trumpet, and saxophone.
Chordophones (stringed instruments): These instruments produce sound by vibrating strings. Examples include guitar, violin, and piano.
Membranophones (instruments with a membrane): These instruments create sound by using a vibrating membrane. Examples include drums and tambourines.
Idiophones (self-sounding instruments): These instruments produce sound through their own vibrations. Examples include xylophone, maracas, and cymbals.

Answer: C

1054 g

Explanation:

Given that the object is in the shape of semi sphere with diameter of 8.2cm. And density of 7.3g/cm^3.

From definition of density,

Density = mass/volume

Volume of a half - sphere = 2/3πr^3

Volume = 2/3 × 3.143 × 4.1^3

Volume = 144.35 cm^3

Let make mass the subject of formula

Mass = Density × volume

Mass = 7.3 × 144.35

Mass = 1053.74g

The mass of the paperweight, in grams is 1054

Answer:

True

Explanation:

It represents the flow of electrons through a conductive material, such as a metal wire. It is measured in amperes. The SI unit of electrical current is the ampere, defined as 1 coulomb/second.

Answer:

True

Explanation:

Answer:

Yes

Explanation:

Genecon is hand operated power generator. So, it can be use to charge a battery.

Final answer:

Yes, both a battery and a Genecon act like pumps for charge.

Explanation:

A hair dryer is a pump for air, and yes, a battery and a Genecon act like pumps for charge. In a battery, an external electrical current is provided to pump the electron flow in the uphill direction, recharging the battery. Similarly, in a Genecon, mechanical energy is converted into electrical energy by rotating a coil inside a magnetic field, acting as a pump for charge.

When it comes to devices that use AC (alternating current), such as hair dryers, the AC potential from the power grid pushes charges back and forth in the circuit of the device, creating an alternating current.

Answer:

Explanation:

320 k Cal = 320 x 4.18 k J

= 1337.6 kJ

For rise in temperature the formula is

Q = m s Δ T

Q is heat added , m is mass of the water to which heat is added , s is specific heat of water , Δ T is rise in temperature .

1337.6 x 10³ = 1.5 x 4.18 x 10³ x  Δ T ( specific heat of water is 4.18 kJ per kg.)

ΔT is more than 70 degree . That means , heat is sufficient to boil it .

So final temperature will be 100 degree Celsius.

Answer:

A. It will transform into other forms of energy.

Explanation:

According to the law of conservation of energy, energy is never created or destroyed. Only changed from one form into another.

Answer:

I think the answer would be antigens

Explanation:

Answer:[tex]E=33.71\ J[/tex]

Explanation:

Given

No of atoms of hydrogen [tex]N=5.54\times 10^{21}[/tex]

Temperature of room [tex]T=21^{\circ}\approx 294\ K[/tex]

Thermal energy of the atoms is given by

[tex]E=\frac{3}{2}NkT[/tex]

where k=boltzmann constant

[tex]E=\frac{3}{2}\times 5.54\times 10^{21}\times 1.38\times 10^{-23}\times 294[/tex]

[tex]E=33.71\ J[/tex]

Hence the energy of the atoms is [tex]33.71\ J[/tex]

Final answer:

The thermal energy of hydrogen atoms at 21°C can be calculated using the average kinetic energy per atom, which is determined by the equipartition theorem (⅒kT), and multiplying it by the total number of atoms in the sample.

Explanation:

To find the thermal energy of hydrogen atoms in a sample at room temperature (21°C), we need to use the equation for the average kinetic energy per molecule due to thermal motion, which is given by the equipartition theorem. The equipartition theorem states that each degree of freedom contributes (⅒)kT to the energy, where k is Boltzmann's constant (1.38 × 10⁻²³ J/K) and T is the temperature in Kelvin. For monoatomic gases like hydrogen as atoms, they have three degrees of freedom (translational motions along x, y, and z axes).

First, convert the given temperature from degrees Celsius to Kelvin: T(K) = 21°C + 273.15 = 294.15 K.

Then, calculate the average kinetic energy per hydrogen atom: KE_avg = (⅒)kT.

Finally, multiply the average kinetic energy by the number of atoms to get the total thermal energy: Thermal Energy = KE_avg × number of atoms. Don't forget, the 'number of atoms' given in the question is in scientific notation, where 5.54 × 10²¹ actually means 5.54 times 10 raised to the power of 21.

Therefore, Thermal Energy = (⅒) × (1.38 × 10⁻²³ J/K) × 294.15 K × 5.54 × 10²¹ atoms.

When you calculate the above expression, that will give you the thermal energy of the hydrogen atoms in Joules.

Answer:

they don't have a charge

Explanation:

the neutrons are neutral :)

Neutrons in an atom's nucleus are electrically neutral and have no charge, contrasted with positively charged protons; both contribute equally to the atomic mass.

The neutrons within the nucleus of an atom have no charge. Neutrons are one of the two types of particles found in the nucleus, the other being protons. While protons carry a positive charge, neutrons are electrically neutral. In other words, they do not possess any charge, neither positive nor negative.

This unique property of neutrons allows them to add to the mass of an atom without affecting its charge. Furthermore, the mass of both protons and neutrons is represented as 1 atomic mass unit (amu), making them essential for the atomic mass. However, in terms of electrical contribution, neutrons play no role in the charge of the atom.

Final answer:

To reduce the risk of fire spread in a building, it is essential to install fire sprinkler systems and ensure minimum levels of security. Material choice, space planning, regular maintenance, proper storage, and adherence to fire safety procedures are all critical measures. Safe evacuation practices and fire suppression innovations also contribute to fire safety.

Explanation:

Reducing the Risk of Fire Spread in a Building

Taking into account the chemistry and physics of fire, several strategies can be implemented to reduce the risk of fire spread in a building. One crucial element is the installation of minimum level of security and fire sprinkler systems, which can provide an immediate response to a fire, potentially containing it or putting it out before it spreads. A solid understanding of the fire triangle (oxygen, fuel, and ignition source) informs that limiting any of these can help prevent fires.

Additionally, using materials with low flammability for construction and interior design, as well as careful planning of space to avoid fuel load concentration, can greatly reduce the risk of fires. Regular inspections and maintenance of electrical systems, proper storage of flammable materials, and the implementation of smoke detectors and alarms are vital. Fire safety education and clear procedures for evacuation are equally important to ensure the safety of individuals in case of a fire. Furthermore, innovative solutions such as fluorinated foams can help extinguish fires more efficiently when they occur.

Answer:

Covalent

Explanation:

Took the test and got it right :)

A covalent bond is a type of bond where two or more atoms share electrons.

The type of bond that shows two or more atoms sharing electrons is covalent.

A covalent bond is formed when two or more atoms share electrons in order to achieve a stable electron configuration. These shared electrons are found in the outermost energy level of the atoms involved.

For example, in a water molecule (H2O), each hydrogen atom shares its electron with the oxygen atom, resulting in a covalent bond.

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