A 150 kg hoop rolls along a horizontal floor so that the hoop's center of mass has a speed of 0.130 m/s. how much work must be done on the hoop to stop it?

Answer:Relative abundance.

Explanation:

Relative abundance is the percentage of a particular isotope that occur in nature.

Answer:

Number 1 is C

Number 2 is D

.56 A

Answer: The tension in the string is 6 N

Explanation:

Tension is defined as the pulling force that is applied on a string, chain etc.. Force is also defined as the mass multiplied by the acceleration of the object.

Mathematically,

[tex]F=ma[/tex]

where,

F = tension or force exerted in the string

m = mass of the cart pulling the string = 3.00 kg

a = acceleration of the string = [tex]2.00m/s^2[/tex]

Putting values in above equation, we get:

[tex]F=3.00kg\times 2.00m/s^2\\\\F=6N[/tex]

Hence, the tension in the string is 6 N

Question 1:

which subatomic particle has a negative charge?

Answer:

Electron

Explanation:

There are three subatomic particles

electron, neutron and proton

out of all electron is negatively charged, proton is positively charged while neutron is a neutral particle

Question 2:

if an atom has 2 protons, 3 neutrons, and 3 electrons, what is the electrical charge of the atom?

Answer:

Negative

Explanation:

As we know that

[tex]Q = (N_p - N_e) e[/tex]

[tex]N_p = 2[/tex]

[tex]N_e = 3[/tex]

[tex]Q = (2- 3)e = -e[/tex]

so it is negatively charged

Question 3:

A neutral atom that gains electrons will have what kind of charge?

Answer:

Negative

Explanation:

Since electron is a negatively charged particle so on gaining an electron it will get negative charge

Question 4:

which of the following describes the principle of the conservation of charge?

Answer:

Charge cannot be created or destroyed, just transferred

Explanation:

charge can transfer from one atom to other atom but we can not create a charge  or we can not destroy a charge

Question 5:

what law states that when there is an interaction between charged objects there is a non-contact force which acts over some distance of seperation?

Answer:

Coulomb's law

Explanation:

Coulombs law gives the force of attraction or repulsion between two charges which is given as

[tex]F = \frac{kq_1q_2}{r^2}[/tex]

Question 6:

which of the following describes an insulator?

Answer:

Does not allow electrons to move through it

Explanation:

in insulators all the charges are bounded and not free to move

Question 7:

what are most conductors made of?

Answer:

Metal

Explanation:

All conductors are source of free electrons in which they can move freely

Question 8:

which of the following describes why lightening rods are put on top of houses?

Answer:

conduct the lightening away from the house

Explanation:

lightening rod gives the path to excess charge to flow towards ground

Question 9:

your computer is powered by which of the following?

Answer:

Electrical current

Explanation:

All electrical device is powered by current source

Question 10:

wire is used to attach a battery to a penny and is then used to light a small light bulb. the light bulb is lit due to which of the following?

Answer:

electric current

Explanation:

electric current gives energy to glow the bulb

Answer:the number of protons

Answer:if you're doing usatestprep the answer is B

Explanation:

The graph that BEST represents the speed of sound relative to the density of the medium it is travelling through is B.

Particle-to-particle interaction causes a pressure disturbance to propagate across a medium as a sound wave. In order to move energy through the medium, each disturbed particle exerts a force on the next neighbouring particle behind it. This causes that particle to become disturbed from rest.

A sound wave's speed is determined by how quickly the disturbance is transferred from particle to particle, much like any other wave. Speed is the amount of movement a disturbance makes per unit of time, whereas frequency is the number of vibrations a single particle makes per unit of time.

In the given four graph speed of sound versus density, in graph B there is linear variation. So graph B is best.

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Answer:

b) The potential energy is at a maximum.

Explanation:

It happens because the equation for the potencial energy is a function of the height of the body (Epotential=mgh) and, when you reach the top of your jump, you obviously reach your maximum height.

Final answer:

The potential energy is at its maximum at the top of the jump on a trampoline, with kinetic energy being zero and mechanical energy equating to the potential energy. The correct option is b) The potential energy is at a maximum

Explanation:

The correct answer to the question is that at the top of your jump on a trampoline, the potential energy is at its maximum (b). This is because when you are at the peak of your jump, you have the maximum height above the ground, where the gravitational potential energy is highest when assuming gravitational force is the only significant force in play (air resistance being negligible).

Kinetic energy is zero at this point because you are momentarily stationary at the top of the jump before descending back down. The mechanical energy of the system is not zero, however, as it is the sum of kinetic and potential energy and therefore will equal the potential energy at the top of the jump.

Answer: The ball.

Explanation: Right before the impact, the bat will have a bigger acceleration than the ball (assuming that the ball is trowed softly), and after the impact, there will be some energy of the bat transferred to the ball. As the ball has a lot less mass than the bat, it is "easily" accelerated:

Remember that the second Newton's law says that:

F = m*a

So, after the impact, the ball has a greater acceleration than the bat (Also, if the bat had more acceleration than the ball, it will "push" the ball, but you can see that the ball "escapes" to the bat after the initial impact).

The correct answer would be A. boiling point. And the reason to that is because pH, toxicity, and rusting ability are all examples of chemical properties.

Answer:

boiling point

Explanation:

Physical property doesn't change the composition of the substance. Boiling point only change the matter, not the composition.

I took the test before. I got all the answer correct and got 100% score.

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Learning Properties of Matter Quiz Unit 2 Lesson 11 Grade 8

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The correct answer is "refraction", I just answered it on usatestprep.

Answer:

Satellite D has a mass (kg) of 500 and the distance from Earth (km) is 320.

Explanation:

The universal law of gravitation states that the force between two objects in the universe is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

We have to choose the satellite having greatest gravitational force with earth. In all options the distance from the earth is same i.e. 320 km. So, we have to select the satellite having maximum mass because the mass of the earth is constant.

Hence, the correct option is (D) " Satellite D has a mass (kg) of 500 and the distance from Earth (km) is 320 ".

Answer: Option 4, the satellite D.

Explanation: The gravitational force between two objects is given by the formula:

[tex]F = G\frac{m1*m2}{r^2}[/tex]

where m1 and m2 are the masses of the objects, G is a constant, and r is the distance between both objects.

From this equation, you can see that the gravitational force between two objects increments when the masses of the objects increases, and when the distance between the object decreases.

You can see that all the options are at the same distance from the earth, 320km, then the only factor that changes is the mass of the satellite.

And, based on the previous, the satellite with more mass is the satellite that has the greatest gravitational force with the earth, and this would be the satellite D, with amas of 500kg.

Answer:

Affects the dependent variable.

Explanation:

A dependent variable is defined as the variable which is being tested during an experiment.

The dependent variable is the variable which is always dependent on the independent variable.

As in the experiments if the the value of independent variable then this change in independent variable will change the value of dependent variable.

For example: A scientist is recording the effect of light and dark on the moth by turning it off and on. In this case, the amount of light is independent variable and the moth's reaction is dependent variable. It means a change in the independent variable directly affect the dependent variable

Final answer:

The Doppler effect involves changes in frequency due to the relative motion between a wave source and its observer, not changes in the speed of sound.

Explanation:

What occurs with the Doppler effect are changes in frequency due to motion. The Doppler effect is a phenomenon observed with waves, where there is an alteration in the observed frequency of a sound or light due to the relative motion between the source and the observer. It's important to note that the Doppler effect does not involve a change in the speed of sound due to motion, but strictly involves changes in frequency.

The practical applications of the Doppler effect are vast, ranging from medical diagnostics using Doppler-shifted ultrasound to determine blood flow, to astronomy where it helps in the study of the motion of stars and galaxies. Fundamentally, the effect explains how the motion affects the perceived pitch of a sound for an observer; for example, the high pitch of an approaching ambulance siren that lowers as it moves away.

Answer: The correct options are:

               A note being played on a saxophone

               An opera singer breaking glass with her voice a person pushing

               A swing at the rate it naturally oscillates back and forth

Explanation:

Resonance is a phenomenon which occurs when the applied frequency on the object is equal to its natural frequency.

When resonance occurs the amplitude of the vibrating object becomes large.

In the given options, the examples of the resonance are as follows:

"an opera singer breaking  a glass with her voice a person pushing": Here, the resonance will occur due to which the glass will break. The applied frequency of the voice of a person on the glass matches with the natural frequency of the glass.

"a note being played on a saxophone": Here, the resonance will occur. The sound energy is produced by saxophone. The air is blown through mouthpiece in it. It causes reed to vibrate rapidly against mouthpiece. Then, air moves through it. Then, the sound is amplified until it escapes through open tone holes.

"swing at the rate it naturally oscillates back and forth": when the applied frequency on the swing matches with the natural frequency of swing. The amplitude of the swing will increase. Here, the resonance will occur.

Answer:

B. a note being played on a saxophone

C. an opera singer breaking a glass with her voice

D. a person pushing a swing at the rate it naturally oscillates back and forth

Edge.2023

Explanation:

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The correct answer is c. not affected by change in mass

The law of conservation of momentum states that, for an isolated object (=zero net external force acting on it), the momentum of the object is conserved.

As a result, if there are no external forces acting on the object in the problem, its momentum will not change even though its mass changes. In fact, the momentum is given by the product between mass and velocity:

[tex]p=mv[/tex]

therefore, when the mass of the object decreases by a factor of 4, the velocity will increase by a factor of 4, keeping the momentum of the object constant.

Momentum is reduced to one-quarter of its original value when the mass of an object decreases from 100 grams to 25 grams, assuming velocity remains constant. The correct answer is option 'a'.

Understanding Momentum and Mass

Momentum is defined as the product of an object's mass and its velocity, given by the formula: momentum = mass × velocity.

When the mass of a moving object decreases from 100 grams to 25 grams, while assuming the velocity remains constant, we can calculate the change in momentum as follows:

Therefore, the final momentum is one-quarter of the initial momentum because 25 grams is one-quarter of 100 grams.

Answer: Option D

Explanation: The rainforest is the place rich in diversity. There are different types of plants and animals in the rain forest.

The organism that is living their should have black spotted skin coat which can act as camouflage when the organism is stalking the prey.

So, the best adaption in the rain forest will be black spotted skin.

Answer:

Few guidelines which are choosing for the personal self assessments, that work for your best and raise your health standards, instead of others doing this on the behalf of yours.

Explanation:

There are some guidelines which are discussed below for using self assessments.

Quality tests, honesty, and goal are some guidelines for using self-assessments.

It can be beneficial to keep in mind the following rules when utilizing self-assessments:

Recognize the Goal: Self-assessments can be used to evaluate abilities, personality qualities, or emotional health. Understand the goal of your self-assessment and what you hope to achieve from it before you begin.

Quality test: Use tests that have been validated, trustworthy, and well-designed. Look for evaluations that have been created by reliable sources, such as renowned organizations or subject-matter experts.

Reflect Honestly: Go into self-evaluations with an open mind. Instead of responding the way you believe you should, give responses that reflect your actual thoughts, feelings, and actions.

Hence, quality tests, honesty, and goal are some guidelines for using self-assessments.

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Answer:

the car is moving clockwise at 30 m/s

Explanation:

For an object moving in circular motion:

- The velocity is always tangential to the circle

- The acceleration (centripetal acceleration) is towards the centre of the circle, so perpendicular to the velocity)

In this case, the velocity is directed due east, while the acceleration is directed due south: so the car is "curved towards south while moving", this means that the car is travelling clockwise.

Moreover, the centripetal acceleration is given by:

[tex]a=\frac{v^2}{r}[/tex]

where

a = 3 m/s^2 is the acceleration

v is the speed

r = 300 m is the radius of the track

Solving for v,

[tex]v=\sqrt{ar}=\sqrt{(3 m/s^2)(300 m)}=30 m/s[/tex]

So the answer is

the car is moving clockwise at 30 m/s

In a clockwise circular motion, when a car's velocity is east, its inward or centripetal acceleration is due south. Circular motion rules dictate this because acceleration is towards the centre. However, the car's speed can't be deduced from this data.

The student's question pertains to the concept of circular motion dynamics, which is a topic in physics. The key is understanding that a car moving in circular motion always has an acceleration directed towards the center of the path, also known as centripetal acceleration. The direction of velocity, which is tangential to the path, continually changes due to this inward acceleration.

If we consider a car moving clockwise around a circular track when viewed from above - the east would be on its right and south would be below. In this scenario, when the car's velocity is directed due east, the centripetal acceleration (due to the car's need to change direction to stay on the circular path) will be facing due south.

Regarding the speed of the car, it can be moving either clockwise or counterclockwise at either 10 m/s or 30 m/s. However, this information cannot be determined from the acceleration data as there is no measure of the car's tangential acceleration, which is the acceleration that affects the car's speed.

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Odd-shaped ceilings, decorative panels, draperies, and glass windows reduce echoes and noises.

An echo is a sound that is caused because of the reflection of sound.

In order to avoid echoes, we must avoid creating surfaces where the sound waves can be focused.

Now, as we know the reason why echoes are formed and how can they be avoided, therefore,

Making odd-shaped ceilings and decorative panels reduces the surfaces where the sound waves can be focused. While putting draperies and glass windows will absorb the sounds, As glass absorbs the sound waves and convert the energy into vibration energy.

Hence, odd-shaped ceilings, decorative panels, draperies, and glass windows reduce echoes and noises.

Learn more about Echo:

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Final answer:

Air is best described as a homogeneous mixture. This classification indicates that air is composed of various gases such as nitrogen, oxygen, and other trace gases, mixed uniformly. It is neither an element nor a compound.

Explanation:

Air Composition Classification

When assessing the nature of air, the correct classification from the given options would be 'C. Mixture'. To be more specific, air is a homogeneous mixture made up of multiple substances, including primarily nitrogen and oxygen, as well as argon, carbon dioxide, and other trace gases, which are evenly distributed throughout the mixture. Air is not an element, because it consists of more than one kind of atom; it is not a compound, as its composition can vary and is not a single chemical substance with a fixed ratio of elements. Instead, air exemplifies a solution, which is a type of homogeneous mixture.

Examples of Elements, Compounds, and Mixtures

Salt is a compound (NaCl).

Pure water is a compound (H2O).

Soil is a heterogeneous mixture, composed of various organic and inorganic materials.

Salt water is a homogeneous mixture or a solution, where the salt is dissolved evenly in the water.

Pure air is a homogeneous mixture of gases.

Carbon dioxide (CO2) is a compound.

Gold is an element (Au).

Bronze is a metal alloy, a type of homogeneous mixture of copper and other metals like tin or aluminum.

To accelerate the block of ice at a rate of 3.5 m/s², the student must apply a force of 43.75 Newtons.

To calculate the force required to accelerate the block of ice, we can use Newton's second law of motion, which states that F = ma, where F is the force, m is the mass, and a is the acceleration.

In this case, the mass of the block of ice is 12.5 kg and the acceleration is 3.5 m/s². Plugging these values into the equation, we get:

F = (12.5 kg) * (3.5 m/s²) = 43.75 N

Therefore, the student must apply a force of 43.75 Newtons to the ice in order to accelerate it at a rate of 3.5 m/s².

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The total mechanical energy of the ball is the sum of its potential energy U and its kinetic energy K, therefore:

E=U+K=57 J+61 J=118 J

so, the total mechanical energy of the basketball is 118 J.