Which image illustrates the bending of a wave around the edge of an
obstacle?

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: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:

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:[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:

It is made up of iron, steel or any other ferromagnetic substance or ferromagnetic composite, having permanent magnetic properties. The magnet has two poles: a north and a south pole. When you suspend it freely, the magnet aligns itself so that the north pole points towards the magnetic north pole of the earth.

The type of magnetism present in a bar magnet is permanent. The correct option is D.

A substance which is negative charged at one end and positive charged at another end creating the magnetic field around it.

A bar magnet also has magnetic fields around it. In the presence of magnetic force fields, any magnetic object will be attracted to it.

It is made up of iron or steel or any other ferromagnetic substance which have permanent magnet properties.

The magnet has two poles: a north and a south pole. When you suspend it freely, the magnet aligns itself so that the north pole points towards the magnetic north pole of the earth.

So, the type of magnetism present in a bar magnet is permanent.

Thus, the correct option is D.

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Answer:

I think the answer would be antigens

Explanation:

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: 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:

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:

T cell

Explanation:

Answer:

I would say the correct answer is Option D

Explanation:

The united states not only has freedom of religion, but also the ability to become a naturalized citizen if you're an immigrant. Because of this we live in a very diversely populated country both racially as well as religously which overall means ethnically but hey, what do i know?

Please mark as brainliest :)

Answer:

B) Polonium(Po)

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.

Explanation:

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:

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:

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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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.

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:

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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The amount of electrons inside an atom's outer shell governs the chemical reactivity and ability to bind with other elements, and this relationship between an element's valence and chemical activity can be seen.

In chemistry, an element's valence—also called valency—determines the number of other atoms that an atom of the metal can combine with.

The phrase, which was first used in 1868, is used to indicate both the broad power of a combination of elements and its numerical value. For 19th-century chemists, the explanation and systematization of valence presented significant difficulties.

The majority of the work was on developing empirical rules for finding the connotations of the elements because there was no good hypothesis explaining its source.

For 19th-century chemists, the explanation and systematization of valence posed significant difficulties. The majority of the effort was focused on developing empirical guidelines for finding the electron orbitals of the components because there was no good theory for its cause.

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Answer:

c. 40 N/m

Explanation:

EE = ½ kx²

5 J = ½ k (0.5 m)²

k = 40 N/m

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:

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: Convection :)

Answer:

D.  Convection

Explanation:

The air inside the refrigerator is cooled by convection, which circulates colder air around the food and warmer air out of the refrigerator.

Answer:

Kinetic and heat energy (heat as thermal)

Explanation:

The friction of the rubbing builds up the energy, so it cant be the types of energy like light or sound

Answer:

A) Moves closer together