A ball is dropped from a height of 20 meters. At what height does the ball have a velocity of 10 meters/second?
A.5.1 meters
B.9.8 meters
C.25 meters
D.15 meters

Answer:

A-Z

Explanation:

A proton has an estimated weight of 1.

Answer:

N = A - Z

Explanation:

Atomic number is the number of protons in a nucleus

Atomic mass is the number of protons and neutrons

N will be give when you subtract A from Z giving you the number of neutrons

      hope this helps thx

Answer:

a=12 m/s²

Explanation:

Newton's second law of motion states that the acceleration of a body is directly proportional to the force applied and takes place in the direction of force.

This can be summarized as: F=ma, where m is the mass of the object on which force F acts. a is the acceleration due to the force applied.

12N= 1kg×a

a=12N/1kg

a=12m/s²

Answer:

I'm not sure if your question is how do you refuse alcohol but my answer is D.

Explanation:

If you get offered to drink you can use good excuses such as, "That's not really my things sorry." Or " Nah, i'm good". Make sure it is a firm response so the offerers don't keep asking

Hope this helps

if it does please mark brainliest :D

-A. Hazle

Answer:

D.) Prepare excuses

Explanation:

Answer:

The answer is true. The horizontal line on the Periodic Table is called periods.

Answer:

Rows

Explanation:

The horizontal _rows_ on the periodic table of elements are called periods.

Answer:

If they were reduced to the levels like those during the ice ages, I think the Earth might go back to being frozen again.

Right now, what make the glaciers and polar ice caps melt?

Global Warming and greenhouse gases are depleting the Ozone. The Ozone is what traps the heat from the Sun and radiates it back to the Sun. Greenhouse gas is depleting the Ozone, which means that the heat from the sun is less protected, which results in climate change. It makes the Earth hotter which can mean that the glaciers are melting because the climate in the North and South pole is way to hot for it to stay frozen.

Hope this helped!

Answer: Earth would become frozen and also greenhouse gases reduce the ozone layer which is why  glaciers are melting and Earth is getting hotter. It is why greenhouse gases are a big issue.

Answer:

9.8 m/s/s

Explanation:

The numerical value, in meters per second squared, of the acceleration of an object experiencing true free fall is 9.8 m/s/s. This is called the acceleration due to gravity.

Answer: 9.8

The velocity of a free-falling object can be discovered by using a simple mathematical formula: v = (9.8 m/s2) * time

Explanation:

Answer:

Energy and another nucleus of the new element/particle.

Explanation:

A nuclear decay is an radioactive decay where the nucleus of an atom becomes unstable and loses energy through emitting radiations.For example, there is an alpha decay that release  an alpha particle called helium-4, a beta decay that involve releasing a beta particle which normally occurs in a nucleus that has more neutrons than protons.Other decays are the gamma decay,electron capture and the spontaneous fission.Nuclear decay produces a lot of energy and radiations that could harm human cells if exposed.

Nuclear decay results in the formation of new elements or isotopes, which can involve beta decay, gamma decay, and alpha decay processes; notably, in reactors, this can lead to the production of plutonium-239 from uranium, and in supernovae, it results in the emission of gamma rays as elements like nickel decay into stable isotopes.

Nuclear decay forms new elements or isotopes by the transformation of one nuclide into another. This process can occur in various forms, such as beta decay, gamma decay, and alpha decay. For instance, in nuclear reactors, plutonium-239 is formed as a byproduct during the decay of uranium through a successive process where uranium-238 captures a neutron to become uranium-239, which then undergoes beta decay to become neptunium-239 and subsequently undergoes another beta decay to form plutonium-239.

Beta decay involves the conversion of neutrons to protons or vice versa within the nucleus, along with the emission of electrons or positrons and neutrinos or antineutrinos, driving the nuclide towards a stable configuration. Gamma decay involves the emission of high-energy photons, usually after another decay process has left the nucleus in an excited state.

A notable natural occurrence of nuclear decay happens in supernovae, where elements like nickel-56 decay into cobalt-56 and eventually to the stable isotope iron-56, emitting gamma rays that contribute energy to the expanding supernova remnant.

Elements in Group VIIIA (noble gases) have similar properties because they all have full octets in their outer energy shells, making them extremely unreactive due to having complete valence electron configurations.

Elements in Group VIIIA, also known as Group 18 or the noble gases, have similar properties because they all have full octets, which means their outer energy shells are complete. This results in them being very unreactive. The similarity in chemical properties among elements of the same group occurs because they have the same number of valence electrons, which determines how they react.

O 809.

The heat absorbed from the heating of water can be calculated by the product of the mass of the sample, specific heat, and the difference in temperature. From the given data, we can simply calculate the mass of the sample as follows:

H = mC(T2-T1)

2500 = m(4.186)(60-20)

m = 14.93 g.

Energy can be converted from one form to another. Examples: Gasoline (chemical) is put into our cars, and with the help of electrical energy from a battery, provides mechanical (kinetic) energy. Purchased electricity is fed into our TVs and is converted to light and sound.

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The mass of water that is heated under these conditions is calculated to be around 0.149 g using the formula m=Q/(c*ΔT). Therefore, the answer isn't among the given choices.

The question is regarding the calculation of mass using energy, specific heat capacity, and change in temperature. This is a direct application of the formula Q=mcΔT, where Q is heat energy, m is mass, c is specific heat capacity, and ΔT is change in temperature. Given that Q = 2.500 joules, c = 4.186 J/g°C, and ΔT = 60.0°C - 20.0°C = 40.0°C, we can rearrange the formula and solve for 'm': m=Q/(c*ΔT). Substituting the given values, we obtain m = 2.500 joules / (4.186 J/g°C * 40.0°C) = 0.149 g; the answer isn't among the provided choices, and a recheck of your problem statement or calculations may be needed.

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Answer:

16 times that of car A

Explanation:

Moving objects have kinetic energy which is calculated using the formula:

E=(1/2)mv² where m is the mass of the object and v is its velocity.

For car A, kinetic energy =1/2×m×15²

=112.5m........................................i

For car B,  the kinetic energy =1/2×m×60²

=1800m......................................ii

dividing ii by i we get

1800m/112.5m= 16.07

Therefore The kinetic energy of car B is 16.07 times that of car A

In California, changing lanes in the middle of an intersection D. is legal.

Although it is legal, it's not necessarily the safest thing to do in an intersection.

In California, changing lanes in the middle of an intersection C. Is illegal

Changing lanes in driving refers to the act of moving your vehicle from one lane to another on a multi-lane road or highway. Drivers typically signal their intent to change lanes, check blind spots, and ensure it's safe to do so before making the maneuver to prevent accidents and maintain smooth traffic flow.

Changing lanes in the middle of an intersection in California is illegal. The proper and safe way to change lanes is before entering the intersection and when it is safe to do so. Changing lanes within the intersection can disrupt the flow of traffic and potentially cause accidents.

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Answer:

Explanation:

An acid has H as its metal as in H2SO4

A base has OH as its nonmetal as in Mg(OH)2

A salt is made of neither. That's what NaCl is -- a salt.

A small bar magnet placed at any position will align itself according to nearby magnetic fields. In the magnetic field of a larger magnet, its North pole will point towards the South pole of the larger magnet and vice versa. In the Earth's magnetic field, the magnet's North pole will point towards the Earth's geographical North.

To determine how a small bar magnet would be oriented when placed at position x, we must consider the nature of magnetic fields. Every magnet has two poles: a north-seeking pole (N) and a south-seeking pole (S). The orientation of the magnet is dictated by these poles in response to magnetic fields nearby.

Let's say we have a larger stationary magnet with clearly defined North and South poles. If we place the small bar magnet at position x, it will align itself such that its North pole points towards the South pole of the stationary magnet and its South pole points towards the North pole of the stationary magnet. This is because unlike poles attract each other while like poles repel each other.

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A small bar magnet placed at position x will align head-to-tail with Earth's magnetic field, and if near another magnet, it will interact in a way where like poles repel. The bar magnet's orientation will depend on both the Earth's magnetic field and other nearby magnetic fields or magnets.

When a small bar magnet is placed at position x, it will align itself head-to-tail with the natural magnetic field lines of the Earth. This alignment can be affected by the ambient field of the Earth and nearby magnetic materials, but typically, a magnet will settle into an orientation where its north-seeking pole points toward the Earth's magnetic north and the south-seeking pole points toward the Earth's magnetic south.

In the case of two bar magnets, like poles repel and opposite poles attract. If a bar magnet is suspended with the north pole pointing up, it will not only orient along the Earth's magnetic field lines but also interact with any nearby magnets. When placed in proximity to a second magnet with its north pole facing the first magnet's north pole, the second magnet will experience a repulsive force in the +x direction, as implied by the given scenario where one magnet's dipole moment is pointing in the +x direction, and the other's is pointing back towards the origin.

The general behavior of the small bar magnet at position x will follow these principles, and its exact orientation will depend on the specific environmental magnetic influences and interactions with other magnets in the vicinity.

Answer: Charge and distance between them

Explanation: edge 21

Charge and distance between them affect the electrical force between two objects.

An electrical force is a force that acts between objects that have an electric charge. This force is a result of the interaction between the charges of the objects, and it can either be attractive or repulsive depending on the charges of the objects.

The electrical force between two objects is determined by their charges and the distance between them. The strength of the electrical force is proportional to the magnitude of the charges and inversely proportional to the square of the distance between the objects. This relationship is described by Coulomb's law, which states that the force between two point charges is proportional to the product of the charges and inversely proportional to the square of the distance between the charges.

The masses of the objects do not directly affect the electrical force between them. However, the masses of the objects can affect the direction of the electrical force if they are moving, as the force will cause a change in the motion of the objects. The electric field strength is a measure of the strength of the electric force per unit charge and is proportional to the charge density of an object. The electric field strength is not directly related to the mass of an object, but it can be affected by the presence of other charges in the vicinity.

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Answer:

It depends on the size and density but No.

Explanation:

Answer:

The wind will blow from the higher pressure over the water to lower pressure over the land causing the sea breeze. The sea breeze strength will vary depending on the temperature difference between the land and the ocean. At night, the roles reverse. The air over the ocean is now warmer than the air over the land.

Sea breezes occur during hot, summer days because of the unequal heating rates of land and water. During the day, the land surface heats up faster than the water surface. Therefore, the air above the land is warmer than the air above the ocean. Now, recall that warmer air is lighter than cooler air.

Answer:

If the an object is moving in such a way that the magnitude of its velocity is same but its direction is changing then the object is said to be moving with variable velocity. Uniform velocity is when an object has an equal distance and an equal interval of time in a specific direction it is said to have uniform velocity.

The electric potential energy is directly proportional to product of charges, hence when the particle charge is reduced by a factor of 3, the electric potential energy will also be reduced by a factor of 3.

Answer: Option C

Explanation:

Electric potential energy is the potential energy which is conservative to the respective coulomb forces between the two particle charges which are at a specified separation from each other.

Electric potential energy = [tex]\frac{k (q1 q2)}{r}[/tex]

Where the k is the electrostatic constant,

q1 is the first charge.

q2 is the second charge.

r is the distance between q1 and q2.

Answer: C. 14 volts

Explanation:

According to Ohm's law, the voltage [tex]V[/tex] is:  

[tex]V=R.I[/tex]   (1)

Where:

[tex]R=3.2\Omega[/tex] is the resistance of the clock

[tex]I=4.5A[/tex] is the electric current that flows throgh the clock

Substituting these values in (1):

[tex]V=(3.2\Omega)(4.5A)[/tex]   (2)

[tex]V=14.4V\approx14V[/tex]

Answer:

See image

Explanation:

Plato

Answer:

meter

kilometer

inch

Explanation:

The units can be used to measure length or distance are meter, kilometer and inch.

Length is the distance measured from one point to the the other.

Length is the fundamental unit of the physical system. It can be expressed in different units systems like SI, FPS or CGS

Thus, the units used to measure distance are meter, kilometer and inch.

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Answer:

1. science

2. advances in a science may lead to advances in technology and vice versa

3. they help visualize things that are very complex, very large, or very small

4. independent

5. inference

6. by publishing articles in scientific journals

   by giving talks at scientific conferences

7.  they all use SI system

8. a process in which scientists examine other scientists work

9. scientist receive questions and criticism from their peers

10. social science

11. forces cause changes in motion

12. drawing conclusions

    analyzing data

    revising a hypothesis

13. the hypothesis is revised

14. a scientific law

15. Kelvin

Explanation:

1.

The system of knowledge and the methods used to find that knowledge is referred to as science

2.

Science and Technology are related in that advances in a science may lead to advances in technology and vice versa

3.

Scientific models are important because they help visualize things that are very complex, very large, or very small

4.

The variable that is purposely changed and that you wish to test is called the independent  variable.

5. An explanation that tries to make sense of your observations based on personal experience and prior knowledge is called  inference

6. There are a number of possible ways that scientists can use to communicate the results of an investigation;

by publishing articles in scientific journals

by giving talks at scientific conferences

7. Scientists who speak different languages make their data understandable to one another through the use of the SI system .

8. The term peer review refers to a process in which scientists examine other scientists work for the purpose of questioning or criticism.

9. One reason that makes peer reviews important is;

Scientist are able to receive questions and criticism from their peers on a particular work of research.

10. The branches of natural science include;

life science

earth science  

physical science

11. One of the main ideas of physical science is that forces cause changes in motion

12. The main steps of the scientific methods  include;

drawing conclusions

analyzing data

revising a hypothesis

13. What happens when the data in an investigation does not support the original hypothesis;

the hypothesis is revised  

14. What is a statement that summarizes a pattern found in nature?

a scientific law

15. What is the SI units of Thermodynamic temperature?

Kelvin

In physics, 'work' is a force causing the motion of an object. For work to be done, there must be displacement in the direction of the applied force. In the scenario presented, the situation in which no work is done is when a person is carrying a box from one place to another, as the force and displacement are perpendicular to each other.

The concept of 'work' in physics is different from the everyday usage of the term. In physics, work is defined as a force causing the motion—or displacement—of an object. In the concept of work, two key components need to be present: force and displacement in the direction of the force.

With this definition, the scenario where no work is being done is: A. a person carrying a box from one place to another. In this situation, regardless of the weight of the box, if the person carries it horizontally, the force exerted (which is vertically upwards, opposing the weight of the box) and the displacement of the box (which is horizontal) are perpendicular to each other. Since work done is the product of force, displacement, and the cosine of the angle between them, when force and displacement are at 90 degrees, the cosine of the angle is zero and the work done is zero.

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A force of 1 Newton is equivalent to 1 kg (m/s²). The product of mass and acceleration is known as force.

Force is defined as the push or pull applied to the body. Sometimes it is used to change the shape, size, and direction of the body.

Force is defined as the product of mass and acceleration. Its unit is Newton.

F=ma

The Si unit of the force is Newton. While the MKS unit is found as;

F=ma

F = kg (m/s²)

Hence, a force of 1 Newton is equivalent to 1 kg (m/s²).

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Answer:

acid rain.

Explanation:

its kinda obvious.

Hello There!

When "ELECTRIC" and magnetic fields both exist, it is called an electromagnetic field.

An electric field is a field extending outwards in all directions from a charged particle.

Answer:

Electric

Explanation:

electromagnetic fields are created when charged particles are accelerated

The answer is:

The buoyant force is equal to 49N.

The buoyant force is the force that pushes upwards and object when it's submerged in water, this force is always trying to move the object to the surface of the liquid or water.  We must consider that the volume of water or liquid displaced is equal to the volume of the submerged object.

We can calculate the buoyant force using the following formula:

[tex]F_{B}=Density*VolumeDisplaced*GravityAcceleration[/tex]

Where,

Density is the density of the water or liquid.

Volume displaced is equal to the volume of the submerged object.

Gravity acceleration is the acceleration due to gravity.

So, from the statement we know that:

[tex]VolumeDisplaced=BeachBallVolume=5000cm^{3}\\\\Density=1\frac{gram}{cm^{3} }=\frac{0.001kg}{cm^{3} }\\\\g=9.8\frac{m}{s^{2} }[/tex]

Now, substituting and calculating we have:

[tex]F_{B}=Density*VolumeDisplaced*GravityAcceleration[/tex]

[tex]F_{B}=0.001\frac{kg}{cm^{3}*} *5000cm^{3}*9.8\frac{m}{s^{2} }[/tex]

[tex]F_{B}=0.001\frac{kg}{cm^{3}*} *5000cm^{3}*9.8\frac{m}{s^{2} }[/tex]

[tex]F_{B}=49\frac{Kg.m}{s^{2}}=49N[/tex]

Hence, we have that the correct answer is:

The buoyant force is equal to 49N.

Have a nice day!

Power = (current)² x (resistance)

Resistance = (power) / (current)²

Resistance = (3 W) / (0.9 A)²

Resistance = 3.333... ohms

That's the total resistance in the series circuit. (3 and 1/3) ohms .

Voltage = (current) x (resistance)

Voltage = (0.9 A) x (3.333... ohms)

Voltage = 30 volts

That's the total voltage ... the battery that's powering the whole series circuit.  

Using only the information given in the question, there's no way to calculate how much of the 30V appears across the resistor and how much of it appears across the light bulb.

Answer:

the items you connect to a household outlet.

Explanation:

There exists many devices that uses AC current to operate. For example:

1. Electric Clocks. Synchronous clocks rely on the 50 or 60 Hz utility frequency of the AC electric power grid as a timing source. There are cases in which Power Plants decreases its frequency (Most of the times because of a failure), and for that reason you will find that electric clocks are delayed.

2. Fridge. Yes, your fridge needs AC current to work, that's why it's connected to your outlet!

3. Microwave. Yes, also your microwave needs AC current to work.

Basically, all of the items you connect to an outlet works with AC current.

Answer:

It will for sure be data, that is the name for information gathered from any experiment

Answer:

data

Explanation:

Data is the set of observations that a scientist gathers during an experiment. When the data is analyzed and used to prove a hypothesis it becomes information.

The conclusion is the inference drawn from the data after analysis.

Data is used to describe observations in both qualitative or quantitative research.

Research is the overall study of an experiment.

Answer:

NOT:

If copper is a better conductor, it will heat up faster than iron.

Explanation: