Why are models of atoms and molecules useful explain

The velocity is 4.9 m/s.

Centripetal acceleration is the acceleration that acts towards the center of a circular path and is required to maintain an object in circular motion. It is defined as the rate of change of velocity of an object moving in a circular path.

The formula for centripetal acceleration can be expressed as:

a_c = v^2 / r

Given that;

a = v^2/r

a = acceleration

v = tangential velocity

r = radius

Thus;

v = √ar

v = (6 * 4)^1/2

v = 4.9 m/s

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Gary's weight at 300 km above Earth's surface is 91% of his weight at the surface.

The Earth's surface is a living union of its solid crust, atmosphere, hydrosphere, and biosphere, all of which have worked together to create a continually regenerating and dynamic symphony of form. From the Solar System Encyclopedia.

It has a substantial and dynamic surface with mountains, valleys, canyons, plains, and a variety of other features. Earth is unique in that it is an ocean world. 70% of the Earth's surface is covered by water. The Earth's atmosphere is mainly nitrogen, with enough of oxygen for humans to breathe.

a) The mass of an object is an intrinsic attribute, which means that it is determined only by the qualities of the thing and is not affected by its position. As a result, Gary's mass at 300 kilometers above the Earth's surface equals his mass at the Earth's surface.

b) The weight of an object is given by, W = mg

where

m is the mass and g = GM /r²

It is the gravitational acceleration at the location of the object, with G being the gravitational constant, M the mass of the planet and r the distance of the object from the center of the planet.

At the Earth's surface, g = 9.81 m/sec²

so Gary's weight is W = mg

W = 9.81 m  ...........(1)

where m is Gary's mass.

Then, we must calculate the value of g at 300 km above Earth's surface. the Earth's radius is, R = 6370 Km.

So the distance of Gary from the Earth's center is:

r = R + h

r = (6370 +300) Km

r = 6670 km

r = 6.67 × 10⁶ m

The Earth's mass is M = 5.97 × 10²⁴ Kg , so the gravitational acceleration is, g₁ = GM /r²

g₁ = [(6.67 10⁻¹¹ m³ kg⁻¹ s⁻²) × (5.97 × 10²⁴ Kg)] ÷ (6.67 × 10⁶ m)²

g₁ = 8.95 m/sec²

Therefore, Gary's weight at 300 km above Earth's surface is:

W₁ = mg₁

W₁ = 8.95 m  ............(2)

If we compare (1) and (2), we find that Gary's weight has changed by

W₁/W = 8.95 m/ 9.81 m

W₁/W = 0.91

So, Gary's weight at 300 km above Earth's surface is 91% of his weight at the surface.

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Answer:

24 s

Explanation:

8 s / tic    *    3 tic = 24 sec from origin

The energy released in the decay of a thorium atom to a radium atom and an alpha particle is 6.43 × 10^-13 J.

The mass defect, Δm, is the difference in mass between the initial thorium atom and the final products (radium and alpha particle), and is given by:

Δm = (mass of initial thorium atom) - (mass of radium atom + mass of alpha particle)

Δm = 232.038 u - 228.031 u - 4.00 u

Δm = 0.007 u

where;

The energy released in the decay is equal to the mass defect multiplied by the speed of light squared, according to Einstein's famous equation

E = Δmc^2

E = Δm * c^2

where;

Substituting the values, we get:

E = 0.007 u * (1.66054 × 10^-27 kg/u) * (2.998 × 10^8 m/s)^2

E = 6.43 × 10^-13 kg m^2/s^2

E = 6.43 × 10^-13 J

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The 10/90 principle can be a powerful tool for taking control of your situation and improving your life. By taking responsibility for what you can change and focusing on your reaction to the situation, you can make positive changes in your life and become the master of your own destiny.

The 10/90 principle refers to the idea that life is made up of 10% of what happens to you and 90% of how you respond to it. In other words, you may not be able to control what happens to you, but you can control your reaction to it. By taking responsibility for what you can change rather than being a victim of what you cannot change, you can take control of your situation and improve your life.One example of a situation where the 10/90 principle could be applied is losing a job. Losing a job can be a devastating experience, and it can be easy to feel like a victim in this situation. However, by applying the 10/90 principle, you can take control of your situation and make positive changes in your life.The first step in applying the 10/90 principle in this situation would be to take responsibility for what you can change. This could mean updating your resume, networking with others in your field, and applying for new jobs. By taking action and doing what you can to find a new job, you are taking control of your situation and improving your chances of finding a new job.
The second step would be to focus on your reaction to the situation. Instead of dwelling on the negative aspects of losing your job, try to focus on the positive aspects. This could mean using the extra time to pursue a new hobby or spend more time with family and friends. By focusing on the positive aspects of the situation, you are taking control of your reaction and improving your overall well-being.
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Answer:

\(force = mass \times acceleration \\ 100 = 50 \times a \\ a = 2 \: {ms}^{ - 2} \\ from : \: \: v = u + at \\ 150 = 100 + (2 \times t) \\ 50 = 2t \\ time = 25 \: seconds\)

False - Not all poisons are made in labs. Many naturally occurring substances can also be poisonous, such as certain plants and animals.

True - People can be exposed to toxins through ingestion (eating or drinking), inhalation (breathing in), injection (such as with drugs), and absorption through the skin.

False - Poisoning is not a very common method of murder today. While it does happen, other methods such as firearms, suffocation, and blunt force trauma are more common.

False - There are more than 4 types of controlled substances. In the United States, controlled substances are categorized into 5 schedules based on their potential for abuse and medical use.

The 5 groups of controlled substances in the US are:

Schedule I: Substances with no currently accepted medical use and a high potential for abuse, such as heroin and LSD.

Schedule II: Substances with a high potential for abuse and dependence, but also with currently accepted medical uses, such as morphine and cocaine.

Schedule III: Substances with a lower potential for abuse and dependence than Schedule II drugs, but still with accepted medical uses, such as anabolic steroids and some barbiturates.

Schedule IV: Substances with a lower potential for abuse and dependence than Schedule III drugs, such as benzodiazepines and some prescription stimulants.

Schedule V: Substances with the lowest potential for abuse and dependence, such as cough medicines containing small amounts of codeine.

The common effects of each group vary, but they can include pain relief, sedation, euphoria, and other psychoactive effects.

Anabolic steroids can have many harmful effects on the body, including:

Alcohols can be toxic to many tissues in the body, including the liver, brain, and gastrointestinal tract.

Bioterrorism is the deliberate release of biological agents (such as bacteria or viruses) with the intent to harm or kill people, animals, or plants.

Strychnine is a highly toxic substance that can cause muscle spasms and convulsions, leading to respiratory failure and death. Other symptoms can include restlessness, agitation, and high blood pressure.

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If you need to shade the part of a circle indicative of parent material, these are the guidelines:

It should be noted that to complete the shading process, employ techniques such as utilizing solid colors with pencils, markers, cross-hatching, or diagonal lines.

Ensure that you correctly portray the shaded fraction of the circle and provide clear contrasts between the unshaded segment.

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Answer:

plasma is the state with the highest energy level.

The energy transferred in Joules by the radio when it has been switched on for 2 minutes would be 6000 Joules.

Power is defined as the rate of energy transfer or the rate at which work is done, and is given by the equation:

Power = Energy transferred / Time

Rearranging the equation to solve for energy transferred, we get:

Energy transferred = Power x Time

We are given:

Power = 50 W

Time = 2 minutes = 120 seconds

Therefore, the energy transferred by the radio when it has been switched on for 2 minutes is:

Energy transferred = Power x Time = 50 W x 120 s = 6000 J

In other words, the energy transferred by the radio is 6000 Joules.

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Answer:

The compression of the spring is 24.6 cm

Explanation:

magnitude of the charge on the left, q₁ = 4.6 x 10⁻⁷ C

magnitude of the charge on the right, q₂ = 7.5 x 10⁻⁷ C

distance between the two charges, r = 3 cm = 0.03 m

spring constant, k = 14 N/m

The attractive force between the two charges is calculated using Coulomb's law;

\(F = \frac{kq_1q_2}{r^2} \\\\F = \frac{(9\times 10^9)(4.6\times 10^{-7})(7.5\times 10^{-7})}{(0.03)^2} \\\\F= 3.45 \ N\)

The extension of the spring is calculated as follows;

F = kx

x = F/k

x = 3.45 / 14

x = 0.246 m

x = 24.6 cm

The compression of the spring is 24.6 cm

The speed of the object that the point that have been marked as B is 14 m/s

The conservation of mechanical energy is a fundamental principle in physics that states that the total mechanical energy of a system remains constant as long as no external forces do work on the system. This principle applies to systems where only conservative forces are involved, meaning forces that can be derived from a potential energy function.

We know that the kinetic energy is equal to the potential energy thus we have that;

\(1/2mv^2 = mgh\\1/2v^2 = gh\)

v = √2gh

v = √2 * 9.8 * 10

v = 14 m/s

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decreased 5 times

Explanation: if the force increases 5 times between them would decrease 5 times

The final momentum is 25 Kg m/s

In physics, momentum is a measure of an object's motion, calculated by multiplying the object's mass by its velocity. Mathematically, momentum is represented by the symbol "p" and can be expressed as:

p = mv

where "p" is momentum, "m" is mass, and "v" is velocity. Momentum is a vector quantity, meaning that it has both a magnitude (the amount of momentum) and a direction (the direction of the motion).

Given that;

Ft = mv - mu

It then follows that;

F = force

m = mass

v and u are the initial and the final velocities

Thus;

5 * 5 = 5v

v = 25/5

= 5 m/s

The final momentum is thus;

5 m/s * 5 Kg

= 25 Kg m/s

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Your answer would be 21!

Answer:

The distance is  \(x =0.291 \ m\)

Explanation:

From the question we are told that

     The width of the box is \(b = 10 \ cm = \frac{10}{100} = 0.10 \ m\)

     The gap is of length \(l = 1\ m\)

    The natural length of the first spring is \(y = 80 \ cm = \frac{80 }{100} = 0.8 \ m\)

     The spring constant of the first spring is  \(k_1 = 200 N/m\)

     The second spring has a natural length of \(z = 90 \ cm = \frac{90}{100} = 0.9 \ m\)

      The spring constant of the first spring is  \(k_2 = 350 \ N/m\)

Let the distance from the center of the box to the left edge be x

      So at equilibrium

The force applied by the first spring is

      \(F_1 = k_1 * (0.8 -x)\)

and

The force applied by the second spring is

        \(F_2 = k_2 * [ 0.9 - (0.9 -x)]\)

Now at equilibrium

       \(F_1 = F_2\)

So

     \(k_1 * (0.8 -x) = k_2 * [ 0.9 - (0.9 -x)]\)

    substituting values

      \(200 * (0.8 -x) = 350 * [ 0.9 - (0.9 -x)]\)

        =>   \(160 -200x) = 350x\)

        =>  \(160 =550x\)

          =>   \(x =0.291 \ m\)

The point at which the object from a free fall is mostly likely to land on the ground assuming that it was subject to air resistance is that point when the upward force of the air resistance of the object equals the force of gravity downward wise.

Air resistance simply refers to that special force which is made manifest in an opposite direction to an object moving through air. In order words, it is a kind of force which exert a frictional force against an object in motion.

That being said, from the context of the problem given above, this body will land the moment it attains what we call a terminal velocity.

In conclusion, we can now confirm and deduce from the explanation made from above that until the terminal velocity is achieved before the object on a free fall will be able to land ignoring air resistance.

The complete image is attached.

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This question involves the concepts of echo, ultrasonic images, ultrasonic sound waves.

The process of ultrasonic images uses the "echo" property of the sound waves.

Echo is the property of the sound wave by the virtue of which the sound wave reflects back to the source of the sound after hitting a surface or an object.

Ultrasonic images are obtained from inside organs of our body. This process involves the use of ultrasonic sound waves that have a frequency greater than 20,000 Hz. These sound waves are out of the range of audible sound by the human ear. When these ultrasonic sound waves are sent in form of pulses into the human body by the use of probes, they reflect back from the tissues of different organs to the probe. The probe then records the reflection properties of these sound waves and displays them in form of an image, known as ultrasonic images.

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The attached picture shows the process of ultrasonic imaging.

The time taken for the light to travel from the camera to someone standing 7 m away is 2.33×10¯⁸ s

Speed is simply defined as the distance travelled per unit time. Mathematically, it is expressed as:

With the above formula, we can obtain the time taken for the light to travel from the camera to someone standing 7 m away. This can be obtained as follow:

Distance = 7 m

Speed of light = 3×10⁸ m/s

Time = Distance / speed

Time = 7 / 3×10⁸

Therefore, the time taken for the light to travel from the camera to someone standing 7 m away is 2.33×10¯⁸ s

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a. The push is 150 N and acts to the right while the frictional force is 150 N and acts to the left.

b. The weight is 490 N and acts downwards while the normal force is 490 N and acts upwards.

c. The package moves 1.8 m

d. The package's acceleration is 0 m/s²

The push is 150 N and acts to the right while the frictional force is 150 N and acts to the left.a

Since the direction of push and the floor is horizontal, and first horizontal force acting on the package is the push and its magnitude is 150 N.

Also, a frictional force also acts to oppose the motion of the package.

Since the packge moves at a constant velocity of 0.6 m/s, its acceleration is zero and thus the net force on the package is zero.

Let

So, F - f = 0

F = f

= 150 N

So, the frictional force is 150 N and opposite to the push.

So, the push is 150 N and acts to the right while the frictional force is 150 N and acts to the left.

The weight is 490 N and acts downwards while the normal force is 490 N and acts upwards.

Since the floor is horizontal, the vertical forces that act on the package are its weight and the normal force due to the ground.

The direction of the weight is downwards while the direction of the normal force is upwards.

Since the floor is horizontal and the package does not move in the vertical direction, the net vertical force is zero.

So, the net force N - W = 0

N = W

= mg

= 50 kg × 9.8 m/s²

= 490 N

So, the weight is 490 N and acts downwards while the normal force is 490 N and acts upwards.

The package moves 1.8 m

Since distance, d = vt where

So, d = vt

= 0.6 m/s × 3 s

= 1.8 m

So, the package moves 1.8 m

The package's acceleration is 0 m/s²

Since the net force on the package is zero, its acceleration is also zero. Since force, F = ma where

Since F = 0,

ma = 0

a = 0

So, the package's acceleration is 0 m/s²

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Answer:

A. The amount of mass changes only slightly during a chemical

reaction.

Answer:

Explanation:

When the hammer hits the nail it transfers this energy to the nail in order to move it 1cm (0.01m). A transfer of energy is known as "work done" and work done = force x distance. So, force = work done / distance = 25 / 0.01 = 2500N Answer: Average force = 2500 Newtons.

◈ Electric current :

Electric current is defined as the rate of charge flow. (per unit time)

I denotes current

Q denotes charge

t denotes time

Given : I = 2A and t = 2s

To Find : Charge flow in wire (Q)

\(:\implies\sf\:I=\dfrac{Q}{t}\)

\(:\implies\sf\:2=\dfrac{Q}{2}\)

\(:\implies\:\boxed{\bf{\red{Q=4\:C}}}\)

A flow of electrical charge carriers, generally electrons or electron-deficient atoms, is referred to as current.  The charge that will be in the wire is 4 C.

A flow of electrical charge carriers, generally electrons or electron-deficient atoms, is referred to as current. The capital letter I is a typical sign for current. The ampere, abbreviated as A, is the standard unit.

As it is given to us that the current in the wire is 2A, while the time for which the current flows through the wire is 2 seconds.

\(\rm I=\dfrac Qt\)

Substitute the value we will get,

\(\rm 2\ A = \dfrac{Q}{2\ sec}\\\\Q = 4\ C\)

Thus, the charge that will be in the wire is 4 C.

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The mass of the object is approximately 0.457 kg.

The mass of the object attached to the trolley can be calculated using the principle of conservation of momentum. Since the two trolleys couple together and move as a single system after the collision, the total momentum before and after the collision should be the same. Given the mass of one trolley is 0.80 kg and the initial speed is 1.1 m/s, the momentum before the collision is 0.80 kg * 1.1 m/s = 0.88 kg·m/s. After the collision, the total mass is the sum of the two trolleys, and the final speed is 0.70 m/s.

Using the momentum equation, the mass of the object can be calculated as follows:

Total momentum before collision = Total momentum after collision

0.88 kg·m/s = (0.80 kg + mass of the object) * 0.70 m/s

Solving for the mass of the object, we get:

0.88 kg·m/s = (0.80 kg + mass of the object) * 0.70 m/s

0.88 kg·m/s = 0.56 kg + 0.70 kg * mass of the object

0.88 kg·m/s - 0.56 kg = 0.70 kg * mass of the object

0.32 kg = 0.70 kg * mass of the object

Dividing both sides by 0.70 kg, we find:

mass of the object = 0.32 kg / 0.70 kg = 0.457 kg

The two trolleys collide and couple together, the total momentum before the collision is equal to the total momentum after the collision according to the principle of conservation of momentum.

The momentum of an object is defined as the product of its mass and velocity. In this case, the mass of one trolley is known (0.80 kg) and the initial speed is given (1.1 m/s), allowing us to calculate the momentum before the collision.

After the collision, the two trolleys move together at a new speed (0.70 m/s). By setting the initial momentum equal to the final momentum and solving for the unknown mass of the object, we can find its value.

In the calculation, we subtract the masses of the two trolleys from the total mass in order to isolate the mass of the object.

Dividing the difference in momentum by the product of the known mass and the new speed, we obtain the mass of the object. In this case, the mass of the object is approximately 0.457 kg.

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Answer: B

Explanition:

Hope this answer helps you

Answer:

hellli

Explanation:

Sir

can u help me in my physics exams

Answer:

787, 500 N/m

Explanation:

Work = Force • displacement

\(Work = (3500 N)(225 m) = 787500\frac{N}{m}\)

\(W = (3500 N)(225 m) = 787500\frac{N}{m}\)

The ranking is based on the tilt of the Earth's axis and its orbit around the Sun. The figure at 40°N in June receives the most daylight because it is located at a high latitude during the summer solstice in the Northern Hemisphere. The Earth's axis tilts towards the Sun, resulting in longer days and shorter nights. The figure at 40°S in December receives a moderate amount of daylight as it is located at a lower latitude during the summer solstice in the Southern Hemisphere.

The figure at 40°N in December experiences less daylight because it is located at a high latitude during the winter solstice in the Northern Hemisphere, with shorter days and longer nights. Lastly, the figure at 40°S in June receives the least amount of daylight as it is located at a lower latitude during the winter solstice in the Southern Hemisphere, where the days are shortest and the nights are longest. Based on the information given, the ranking of figures based on the amount of daylight they experience in a 24-hour period, from most to least.

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