if you wanted to control sound reflection
in an office would you install metal wood or cork partitions

Answer:

A molecule of an element is composed of exactly two types of atoms.

Explanation:

Answer: I believe that the correct answer is C....I could be wrong though...

Explanation:

So, the pressure exerted by the person on the ground (in units of atm) is close to 0.38 atm.

Hi ! I'm Deva from Brainly Indonesia and I will help explain something about solid pressure material. Remember the definition of pressure in solids is "The amount of force felt per unit area of pressure". So, based on the meaning, it is embodied in the equation :

[tex] \boxed{\sf{\bold{P = \frac{F}{A}}}} [/tex]

[tex] \boxed{\sf{\bold{F = P \times A}}} [/tex]

[tex] \boxed{\sf{\bold{A = \frac{F}{P}}}} [/tex]

With the following conditions :

However, always remember, if the object is a stationary mass and is affected by gravity, then the value of F can be calculated by :

[tex] \boxed{\sf{\bold{F = m \times g}}} [/tex]

With the following conditions :

We know that :

What is ask :

Step by step :

[tex] \sf{P = \frac{F}{A}} [/tex]

[tex] \sf{P = \frac{m \times g}{A}} [/tex]

[tex] \sf{P = \frac{81.9 \times 9.8}{0.0210}} [/tex]

[tex] \sf{P = \frac{802.62}{0.0210}} [/tex]

[tex] \sf{P = 38,220 \: N/m^2} [/tex]

[tex] \sf{P_{(atm)} = \frac{38,220}{101,325}} [/tex]

[tex] \sf{P_{(atm)} = \frac{38,220}{101,325}} [/tex]

[tex] \boxed{\sf{P_{(atm)} \approx 0,38 \: atm}} [/tex]

So, the pressure exerted by the person on the ground (in units of atm) is close to 0.38 atm.

As streams flow through Stone Mountain, layers of sand build up. Over time, the sand particles form a sedimentary rock called sandstone. What causes sandstone to change into metamorphic rock at Stone Mountain? Sandstone experiences intense heat and pressure.

(Correct Answer is above)

Also Mark Brainliest please.

Answer:

Answer is C

Explanation:

I got it right on edg

Answer:

8.99m/s

Explanation:

The book continue to move due to its inertia

Explanation:

We can answer this question by using Newton's first law, which states that:

"When an object is moving with constant velocity (or it is at rest), it will continue moving with constant velocity (or will stay at rest) unless acted upon an external unbalanced force".

This law is also known as law of inertia.

If we apply this law to the situation in the problem, we notice that:

- Before the car stops, the book is moving with constant velocity (25 mph) together with the car

- When the car stops, there are no external forces acting on the book, which is free to continue its motion: so, the book will continue moving at 25 mph forward, due to its inertia. The book will be eventually stopped when it hits the floor (because the floor applies an unbalanced force on it).

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Answer:

A) Burning fossil fuels pollutes the environment

Answer: option A

Explanation:

The wavelength of sound wave with frequency 770 Hz and speed of 290 m/s is equal to 0.3767 m

The wave equation determining the relationship between speed, frequency and wavelength of a sound wave is given by:

Speed of sound = Frequency of sound × Wavelength of sound wave

v = n × λ .................................(1)

Given:

v = Speed of sound wave = 290 m/s

n = Frequency of sound = 770 Hz

λ = Wavelength = ?

From (1)

v = n × λ

Rewriting the equation for λ, we get

λ = [tex]\frac{v}{n}[/tex]

Substituting the values of v and n, we get

λ = [tex]\frac{v}{n} =\frac{290}{770} = 0.3767 \ m[/tex]

Hence, the wavelength of sound wave is equal to 0.3767 m

An elevator has 750,000 J when it is lived 500 meters in the air

Answer: Option D

Explanation:

The expression to find the potential energy completely on the basis of forces that on two objects. It can be written as

[tex]potential\ energy (P . E)=m \times acceleration\ due\ to\ gravity\ (g) \times height (h)[/tex]

Where,

m – mass of object

Acceleration due to gravity =  [tex]9.8 \mathrm{m} / \mathrm{s}^{2}[/tex]

h = 500 meters

Force = 1500 Newton

As we know, according to Newton second law of motion, the force can be expressed in terms of mass and gravity (F= ma). So, the potential energy can be calculated as

[tex]P . E=F \times h=1500(500)=750000 J[/tex]

Hence, an elevator has 750,000 J when it is lived 500 meters in the air.

Answer:

B, D, and E only

Explanation:

According to kirchoffs current law, current splits up when it reaches a junction in a parallel circuit. so A is false.

In a single junction (branch) however, current is constant. so B is true

C is false since equivalent resistance decreases in a parallel circuit with the addition of more resistors.

D is true according to Kirchoff's current law.

E Is true since in a parallel circuit equivalent resistance decreases with the addition of more resistors.

hope this helps.

A parallel circuit is one where the current splits at junctions and follows different paths. Each resistor in the same branch experiences the same current. As more resistors are added to a parallel circuit, the total resistance decreases.

In a parallel circuit, the current splits at junctions and follows different paths through the circuit. This is because each branch of the circuit is independent of the others, which allow the current to divide among the branches. Thus, if one path in the circuit is interrupted, the current in the other paths will continue to flow.

Also, it is correct that every resistor in the same branch of the circuit experiences the same current. The electric current passing through each branch is the same because they are in parallel. However, contrary to what might be expected, the total resistance of the circuit actually decreases as more resistors are added to it. This is due to the nature of parallel resistances, where the total resistance is less than the smallest resistance among the resistors.

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Answer:0.25 meter per second square

Explanation:

Resultant force =√(4×4+3×3)

Resultant force=√(25)

Resultant force =5 Newton

But acceleration= force÷mass

Acceleration=5÷20

Acceleration=0.25

The required magnitude of the acceleration of the body is 0.25 m/s².

The change of velocity with respect to time concerning the application of some net external force is known as acceleration.

Given data:

The mass of the body is m = 20 kg.

The magnitude of forces at right angles are, 3 N and 4 N.

Now the net external force for the given magnitude of forces is calculated as,

[tex]F_{net} = \sqrt{3^{2}+4^{2}}\\\\ F_{net}=5 \;\rm N[/tex]

Now applying Newton's Second law of motion to obtain the value of acceleration as,

[tex]F_{net}=m \times a[/tex]

Solving as,

 [tex]5 =20 \times a\\\\ a= 0.25 \;\rm m/s^{2}[/tex]

Thus, we can conclude that the required magnitude of the acceleration of the body is 0.25 m/s².

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Answer: is Second Law of Thermodynamics (conduction).

john stirs the hot soup with a spoon the heat travels up the spoon to his hand is due to the basic law of conduction, also known as the second law of thermodynamics . Heat always travels from hot things toward the cold things, is proved by the phenomena that a cup of tea always get cold, and and a cold dessert or ice cream always melts. Its not possible that the cup of tea become boiling by itself and similarly an ice cream getting frozen on its own in on a hot day. To understand this point there are three ways in which heat can travel namely, conduction, radiation and convection. The process due to heat travels up to the spoon from the soup towards john's hand is called conduction. Conduction is the process in which heat travels between two solid things that are at different temperature. Cooking soup in a saucepan with a metal spoon will make your fingers hot because of the conduction of heat, that travels through the boiling soup pan through metal spoon towards your hand.

Answer: 4.08 s

Explanation:

We can solve this problem with the following equation:

[tex]V=V_{o}-gt[/tex]

Where:

[tex]V=5 m/s[/tex] is the final velocity of the ball

[tex]V_{o}=45 m/s[/tex] is the initial velocity of the ball

[tex]g=9.8 m/s^{2}[/tex] is the acceleration due gravity

[tex]t[/tex] is the elapsed time

Isolating [tex]t[/tex]:

[tex]t=-\frav{V-V_{o}}{g}[/tex]

[tex]t=-\frav{5 m/s-45 m/s}{9.8 m/s^{2}}[/tex]

[tex]t=4.08 s[/tex] This is the elapsed time

Final answer:

In an elastic collision, momentum and kinetic energy are conserved. To find the velocity of the tennis ball after the collision, we can use the conservation of momentum equation. Solving for the final velocity, we find that the velocity of the tennis ball after the collision is 13.66 m/s east.

Explanation:

In an elastic collision, momentum and kinetic energy are conserved. To find the velocity of the tennis ball after the collision, we can use the conservation of momentum equation:

(m1 imes v1) + (m2 imes v2) = (m1  imes v1') + (m2 imes v2')

where m1 and m2 are the masses of the objects, v1 and v2 are the initial velocities, and v1' and v2' are the final velocities. Plugging in the given values, we have:

(0.311 kg  imes 30.3 m/s) + (0.0570 kg imes (-19.2 m/s)) = (0.311 kg imes v1') + (0.0570 kg imes v2')

Solving for v1', we get:

v1' = ((0.311 kg imes 30.3 m/s) + (0.0570 kg imes (-19.2 m/s)) - (0.0570 kg imes v2')) / 0.311 kg

Now we can solve for v2' by substituting the value of v1' into the equation. After solving, we find that the velocity of the tennis ball after the collision is 13.66 m/s east.

Answer:

formula of acceleration is a = v-u/t

Explanation:

a= ?

v= 10

t= 20

a= 10-0 = 10

a= 10 divided by 20

= 0.5

the acceleration of the car is 0.5 m

Answer: a= 0.5 m/s² moving east

Explanation: To find acceleration use the following equation.

a = vf - vi / t ( vi = 0 at rest)

= 10 m/s - 0 m/s / 20 s

= 0.5 m/s² moving east

Answer:

Mechanical waves require a medium in order to transport energy. Sound, like any mechanical wave, cannot travel through a vacuum.

Explanation:

they need a medium

The mass of the second car is 1434.21 kg

Explanation:

Using law of conservation of momentum,

          [tex]m_{1} u_{1}+m_{2} u_{2}=\left(m_{1}+m_{2}\right) v[/tex]

Given:

[tex]m_{1}[/tex] = 1090 kg

[tex]u_{1}[/tex] = 11 m/s

[tex]u_{2}[/tex] = 0

v = 4.75 m/s

We need to find [tex]m_{2}[/tex]

When substituting the given values in the above equation, we get

[tex](1090 \times 11)+\left(m_{2} \times 0\right)=\left(1090+m_{2}\right) 4.75[/tex]

[tex]11990=5177.5+4.75 m_{2}[/tex]

[tex]4.75 m_{2}=11990-5177.5[/tex]

[tex]4.75 m_{2}=6812.5[/tex]

[tex]m_{2}=\frac{6812.5}{4.75}=1434.21 \mathrm{kg}[/tex]

Answer:

1434.21 kg

Explanation:

Answer:

C

Explanation:

Spoon decrease, water increase

Final answer:

When a hot spoon is placed in cold water, the spoon's entropy decreases and the water's entropy increases as heat is transferred from the spoon to the water. So the correct option is C.

Explanation:

If a hot spoon is placed in a glass of cold water, the entropy of the molecules in the spoon decreases, and the entropy of the water molecules increases. This is because entropy can be thought of as the measure of disorder within a system. The hot spoon transfers heat to the colder water, resulting in a decrease in temperature and therefore a decrease in disorder of the spoon's molecules, leading to lower entropy. Conversely, the cold water gains heat, increasing the disorder of its molecules, thus increasing its entropy. So, the correct answer is (C) spoon decrease, water increase.

Answer:

Explanation:

The greater the mass of an object, the more slowly its temperature increase when it is heated

Answer: Asteroid 1 has more mass than asteroid 2

Explanation:

We can use the conservation of momentum law to find the answer. So, according to this law:

"If two objects or bodies are in a closed system and both collide, the total momentum of these two objects before the collision will be the same as the total momentum of these same two objects after the collision".

This means the momentum before the collision or crash ([tex]p_{i}[/tex]) is equal to the momentum after the collision ([tex]p_{f}[/tex]):

[tex]p_{i}=p_{f}[/tex] (1)

Before the crash:

[tex]p_{i}=m_{1}V_{1}+m_{2}V_{2}[/tex] (2)

Where:

[tex]m_{1}[/tex] is the mass of the first asteroid

[tex]V_{1}=8 km/s[/tex] is the velocity of the first asteroid

[tex]m_{2}[/tex] is the mass of the second asteroid

[tex]V_{2}=-16 km/s[/tex] is the velocity of the second asteroid

[tex]p_{i}=m_{1}(8 km/s)+m_{2}(-16 km/s)[/tex] (3)

After the crash:

[tex]p_{f}=m_{1}U_{1}+m_{2}U_{2}[/tex] (4)

Where:

[tex]U_{1}=-4 km/s[/tex] is the final velocity of the first asteroid

[tex]U_{2}=-2 km/s[/tex] is the final velocity of the second asteroid

[tex]p_{f}=m_{1}(-4 km/s)+m_{2}(-2 km/s)[/tex] (5)

Substituting (3) and (5) in (1):

[tex]m_{1}(8 km/s)+m_{2}(-16 km/s)=m_{1}(-4 km/s)+m_{2}(-2 m/s)[/tex] (6)

Grouping similar terms:

[tex](8 km/s-(-4 km/s))m_{1}=m_{2}(-2 km/s-(-16 km/s))[/tex] (7)

Then:

[tex]m_{1}=(1.16 km/s) m_{2}[/tex] (8) This means [tex]m_{2}[/tex] must be multiplied by 1.16 km/s in order to make this side of the equation equal to [tex]m_{1}[/tex].

Hence:

[tex]m_{1}>m_{2}[/tex]

Answer: Reflective

Explanation:

Most see natural and artificial light sources to be emitters of light and many also believe that bright and shiny objects like mirrors are also sources of light. An important reason for this is that students' conscious experiences of 'reflection' are associated with mirrors and other shiny smooth surfaces.

C. The spring experienced a contact force and the charge experienced a non-contact force

Explanation:

In physics, there are two types of forces:

Therefore, in this example:

So the correct answer is

C. The spring experienced a contact force and the charge experienced a non-contact force

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Answer:

C

Explanation:

I did this test and got 100%

Answer:

you will feel warm

Explanation:

beacause your body will get the warm from warm water tap..

Final answer:

When hands are first placed in hot and cold water and then both into warm water, they will perceive different temperatures due to temperature adaptation. This demonstrates that the sensation of warmth or coolness is relative and is interpreted by the nervous system.

Explanation:

If you were to place one hand in hot tap water and the other in cold tap water and then both in the same warm tap water, you would experience a phenomenon known as temperature adaptation. This occurs because your sensory receptors adapt to the initial temperature exposure. So, when you then place both hands in the warm water, the hand that was in the hot water would feel the warm water as cooler, while the hand that was in the cold water would perceive the warm water as hotter.

This is a clear demonstration that the sensation of 'hotness' or 'coolness' is relative and depends on prior conditions that the sensory receptors in your skin have adapted to. This sensory adaptation helps explain how our nervous system interprets different stimuli depending on preceding conditions. It is not that the 'hotness' or 'coolness' resides in the mind as an idealistic concept, but rather, the interpretation of these sensations is a neurological process that occurs in the brain.

Answer:

11

Explanation:

Because 11 is its atomic number

Answer:

Momentum is [tex]5000\ Kg\ m/s[/tex]

Explanation:

Given the mass of car [tex]1500\ kg[/tex]. And it travels [tex]400\ m[/tex] in [tex]12\ s[/tex].

We need to find its momentum.

We know the momentum is the product of velocity and mass. And is denoted by [tex]P[/tex]

So, [tex]P=m\times v[/tex]

We need to find the velocity of object. Then we will plug that into the equation.

And velocity is distance traveled divide by time elapsed.

[tex]v=\frac{d}{t}\\v=\frac{400}{12}\\v=33.33\ m/s[/tex]

Now,

[tex]P=m\times v\\P=150\times 33.33\\P=5000\ Kg\ m/s[/tex]

The momentum of a 1500 kg car traveling 400m in 12s is calculated by first finding its velocity, then multiplying by its mass, resulting in momentum of 49995 kg·m/s.

The student is asking how to calculate the momentum of a car. Momentum is a physical quantity defined as the product of an object's mass and velocity (p = m * v). The student is asking how to calculate the momentum of a car. Momentum is a physical quantity defined as the product of an object's mass and velocity (p = m * v). To find the momentum of the car, you first need to calculate its velocity, which is the distance traveled divided by the time taken. Since the car travels 400 meters in 12 seconds, its velocity is 400 m / 12 s = 33.33 m/s. Then, you can calculate the momentum by multiplying the mass of the car by its velocity. Therefore, the momentum (p) of a 1500 kg car traveling at 33.33 m/s is p = 1500 kg * 33.33 m/s = 49995 kg·m/s.To find the momentum of the car, you first need to calculate its velocity, which is the distance traveled divided by the time taken. Since the car travels 400 meters in 12 seconds, its velocity is 400 m / 12 s = 33.33 m/s. Then, you can calculate the momentum by multiplying the mass of the car by its velocity. Therefore, the momentum (p) of a 1500 kg car traveling at 33.33 m/s is p = 1500 kg * 33.33 m/s = 49995 kg·m/s.

Answer:

c

Explanation:

Credit unions are nonprofit financial institutions. So, option C.

Unlike banks, which have a national or regional base, credit unions are founded locally.

The fact is that banks are for profit organizations, whereas credit unions are nonprofit ones.

Although they have higher interest rates, credit unions frequently boast superior customer service and fewer expenses.

On the other hand, banks often charge larger fees and lower interest rates.

A credit union's members share ownership in the organisation, whereas bank shareholders share ownership and, depending on the amount of shares they possess, have a role in how the bank is managed.

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The (a) speed increases by square root of 3 on tripling of kinetic energy and (b) kinetic energy is reduced by 1/4th if the speed is halved.

Explanation:

Kinetic energy is the energy exhibited or released by any body in motion. So kinetic energy is directly proportional to the product of mass and square of velocity.

K.E = [tex]\frac{1}{2}mv^{2}[/tex]

(a) Since the kinetic energy is tripled then

New kinetic energy = 3 * old kinetic energy

[tex]\frac{1}{2}mv_{new} ^{2} = 3 *\frac{1}{2}mv_{old} ^{2}[/tex]

On cancelling the common terms of both side, we get

[tex]v_{new} ^{2} = 3 v_{old} ^{2}[/tex]

Squaring on both sides ,we get

[tex]v_{new}=\sqrt{3} v_{old}[/tex]

So the speed is increased by factor of square root when the kinetic energy is tripled.

(b) Similarly, if speed is halved, then

[tex]kinetic energy = \frac{1}{2}m(\frac{v}{2})^{2}[/tex]

Kinetic energy = 1/4×old kinetic energy.

So if the speed is halved, then the kinetic energy will be reduced by 1/4 of old kinetic energy.

Thus, the (a) speed increases by square root of 3 on tripling of kinetic energy and (b) kinetic energy is reduced by 1/4th if the speed is halved.

When the kinetic energy of a particle is tripled, the speed of the particle increases by a factor of √3. Conversely, if the speed of a particle is halved, the kinetic energy decreases by a factor of 1/4.

The kinetic energy (KE) of an object is governed by the equation KE = 1/2mv^2, where m is mass and v is speed.

(a) If the kinetic energy of a particle is tripled, its speed increases by a factor of √3 i.e., approximately 1.73. This is because the kinetic energy equation shows that KE is proportional to the square of the speed, hence if KE is tripled (x3), the speed is multiplied by the square root of 3 (√3).

(b) If the speed of a particle is halved, the kinetic energy changes by a factor of 1/4. This is because the kinetic energy is proportional to the square of the speed, so if the speed is reduced to half (1/2), the kinetic energy is reduced to its quarter (1/4).

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Two dangerous elements can form a compound that is edible known as "NaCl salt".

Explanation:

Sodium and chlorine are two very dangerous elements. As the reaction between sodium and water is extremely violent and chlorine is a very toxic gas. But combination of these elements result into a harmless product with unique properties like it is edible and dissolves without exploding in water.

In sodium chloride reaction the atoms of sodium interact with chlorine atoms. Sodium will donate an electron (by becoming positively charged) to acceptor chlorine (which become negatively charged) as given in following reaction

[tex]N a+C l_{2} \rightarrow N a C l[/tex]

As sodium and chlorine are  very keen to achieve noble gas configuration by completing an octet on donating and accepting an electron respectively.

The dangerous two elements which are compounded together to form an edible compound are sodium (Na) and  Chlorine  (Cl) salt.

The two dangerous elements which are combined to form an edible compound are sodium and chlorine. We know that sodium is exploding material that can explode in water.

Similarly chlorine gas is also a very toxic gas but when we combine both of them then the compound formed will be an edible salt. This compound can easily dissolve in water.

When sodium and chlorine are exposed to each other for the reaction the positive atoms of the sodium gets combined with the negative atoms of the chlorine so the compound of NaCl is formed

[tex]Na^{+}+Cl^{-}=NaCl[/tex]

As sodium and chlorine are very keen to achieve noble gas configuration by completing an octet on donating and accepting an electron respectively.

Thus the dangerous two elements which are compounded together to form an edible compound are sodium (Na) and  Chlorine  (Cl) salt.

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a)The average acceleration of the car is [tex]1.4 \mathrm{m} / \mathrm{s}^{2}[/tex]

b) The distance travelled is 560 m

Explanation:

a) Acceleration is defined as the rate of change in velocity per unit time. So it can be obtained by measuring the ratio of speed to time.

      [tex]Average acceleration =\frac{\text { Final speed - Initial Speed }}{\text { time }}[/tex]

Since here the initial speed was zero and final speed is given as 28 m/s, then time is given as 20 s. So,

      [tex]\text {Acceleration}=\frac{28-0}{20}=\frac{28}{20}=1.4 \mathrm{m} / \mathrm{s}^{2}[/tex]

b) As the speed is given as 28 m/s, then

      [tex]\text {distance}=\text { Speed } \times \text { Time }=28 \times 20=560 \mathrm{m}[/tex]

So the distance travelled is 560 m and average acceleration is [tex]1.4 \mathrm{m} / \mathrm{s}^{2}[/tex].

The work done is 2026 J

Explanation:

First of all, we calculate the distance covered by the body; since the motion is uniformly accelerated, we can use the suvat equation:

[tex]s=ut+\frac{1}{2}at^2[/tex]

where

u = 0 is the initial speed

[tex]a=0.1 m/s^2[/tex] is the acceleration

t = 45 s is the time

s is the distance covered

Substituting,

[tex]s=0+\frac{1}{2}(0.1)(45)^2=101.3 m[/tex]

Now we can find the work done by the force, which is given by

[tex]W=Fs[/tex]

where

F = 20 N is the force applied

s = 101.3 m is the displacement of the object

Substituting,

[tex]W=(20)(101.3)=2026 J[/tex]

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Answer:

Due to Conservation of Energy just as the ball hits the ground it's potential energy is assumed zero

Therefore disregarding air resistance all energy is converted into potential energy.

So KE = PE  

(5 J)