Which is an example of a chemical reaction ?

Answer:

B. 12.0A

Explanation:

The circuit shown in the image is a parallel circuit which mean that the voltage of the source is equal across each resistance in the circuit because they are directly connected to the terminals of the voltage source.

The voltage across the 10 Ohms resistor is 120V

So, let's proceed to calculate the current

By using Ohm's Law

[tex]I=\frac{V}{R} \\I= \frac{120.0V}{10.0Ohm} \\I= 12.0A[/tex]

12A is the amount of current flowing through the 10 ohms resistor.

Current = (voltage) / (resistance)

The ends of the 10-ohm resistor are connected directly to both terminals of the battery.  

So the voltage across the resistor is the voltage of the battery ... 120 V.  None of that other stuff in the circuit has any effect on it.

Current = (120 V) / (10 ohms)

Current = 12 A .  (B)

Answer:

= 60.16 cm/s or 0.6 m/s

Explanation:

Using the formula for collision;

M1U1 + M2U2 = M1V1 + M2V2

Therefore;

(225 kg)•(98 cm/s) + (198 kg)•(28 m/s) = (225 kg)•v + (198 kg)•(71 cm/s)

22050 kg•cm/s + 5544 kg•cm/s = (225 kg)•v + 14058 kg•cm/s

13536 kg•cm/s = (225 kg)•v

v = 60.16 cm/s

Therefore; the post collision velocity of the 225 kg car is 60.16 cm/s

Answer:

Explain that an investigation is observing or studying the natural world, without interference or manipulation, and an experiment is an investigation that involves variables (independent/manipulated and dependent/ outcome) and establishes cause-and-effect relationships (Schwartz, 2007).

Final answer:

Experiments involve controlled manipulation of variables to test a hypothesis, ideal for establishing causation but possibly limited by artificial settings and ethical concerns. Observational studies, on the other hand, involve natural observation without direct interference, which is beneficial for ethical or practical scenarios but can be less definitive in establishing cause-and-effect relationships.

Explanation:

The difference between an experiment and other types of scientific investigations resides in the controlled manipulation of variables. An experiment is a procedure carried out under controlled conditions to test a hypothesis. It typically involves changing one variable (independent variable) to see the effect on another variable (dependent variable), while controlling all other variables.

Another common type of scientific investigation is observational research, which involves making observations of systems or phenomena as they occur naturally. Unlike experiments, observational studies do not involve direct manipulation of variables by the researcher. Instead, researchers observe and record data without interfering.

The benefits of experiments include the ability to establish cause-and-effect relationships due to the control over variables. Limitations might include ethical concerns and artificial settings which may not reflect real-world conditions. Observational studies are beneficial when experimentation is not ethical or practical, offering more natural insights, but they are limited in their capacity to deduce causality due to potential confounding variables.

Summary of the Benefits and Limitations

By wrapping a conductive wire around a steel nail and adding a battery, you've created what is known as a solenoid. This solenoid produces a magnetic field around the nail when a current is passed through it. There is an equation that relates the various properties of the solenoid together to determine the strength of the magnetic field; in short, to increase the strength, you can shorten the overall length of the coiled wire (not the wire itself, but the length of the coil around the nail), increase the current flowing through the wire, or increase the number of turns/loops of wire around the nail.

Hope this helps!

Answer:

The angle of reflection is the angle the reflected rays make with a perpendicular line to the reflecting surface.  

Explanation:

Reflection It is the change of direction suffered by a luminous ray when hitting the surface of an object. The angle of reflection is that which is formed by the reflected ray and the normal vector to the study surface

Answer:

Reflected rays make with a perpendicular line

Answer:

[H3O+] = 0.00520 M

Explanation:

The dissociation of acetic acid in water is given by the equation;

CH3COOH + H2O<-------> H3O+ + CH3COO-  

ka =  [H+][C2H3O2-]/[HC2H3O2]

Ka = 1.8 x 10^-5

      = x^2 / 0.150-x  

x = [H3O+]= 0.00520 M  

Answer: neon atomic 10 hope this helps

Explanation:

Answer:

C.) Neon, atomic number 10

Explanation:

The electric current is measured in coulombs per second. A flow of one coulomb per second is called one ampere

The electric current is the flow of electrons which are negatively charged particles.

 Explanation:

The flow of electrons in a circuit is called the electric current. It is measured with one coulomb of charge across the circuit in 1 second that is called an ampere. This ampere is the standard unit of electric current.

The flow of electrons across the circuit is achieved by the potential difference across the circuit. This potential difference is the difference of electrical voltage generated across the circuit in order to achieve flow of current.

(a) [tex]-1.46\cdot 10^{-4} m/s^2[/tex]

The average acceleration of the ship is given by

[tex]a=\frac{v-u}{t}[/tex]

where

v is the final velocity

u is the initial velocity

t is the time elapsed

Here we have:

[tex]u=34 km/h =9.44 m/s[/tex] is the initial velocity

v = 0 is the final velocity

[tex]t=18 min =64800 s[/tex] is the time elapsed

Substituting, we find

[tex]a=\frac{0-9.44 m/s}{64800 s}=-1.46\cdot 10^{-4} m/s^2[/tex]

(b) 4.72 m/s

Assuming the acceleration is uniform, the average velocity of the ship is given by:

[tex]v_{avg} = \frac{v+u}{2}[/tex]

where

v is the final velocity

u is the initial velocity

Here we have:

v = 0

u = 9.44 m/s

So the average velocity of the ship is

[tex]v_{avg} = \frac{0+9.44 m/s}{2}=4.72 m/s[/tex]

Answer:

When the temperature and pressure of a rock undergoing metamorphism changes. the composition of water allows materials to move more easily, the presence of fluids makes metamorphism more easy.he fluid changes also.

Explanation:

Answer:

It can have elevated concentrations of dissolved substances

Explanation:

Cause I happened to know

Final answer:

To find the coefficient of kinetic friction, use the formula μk = a - sinθ / cosθ where a is acceleration and θ is the angle of the incline. By substituting the given values (a = 0.70 m/s², θ = 25°), the coefficient of kinetic friction is approximately 0.285.

Explanation:

The coefficient of kinetic friction can be calculated using the formula:

μk = a - sinθ / cosθ, where a = acceleration and θ = angle of incline.

Plugging in the values given (a = 0.70 m/s², θ = 25°), we get μk ≈ 0.285.

Answer:The property that describes the amount of energy that flows past a given area per unit of time is called energy flux, denoted by S1. It can be calculated by dividing the energy by the area A and the time interval Δ t. The formula for energy flux is S = Energy passing area A in time Δ t A Δ t = u c = ϵ 0 c E 2 = 1 μ 0 E B1. In electromagnetism, current density is the amount of charge per unit time that flows through a unit area of a chosen cross section2.

Explanation:

Answer:

A

Explanation:

because the climate of a place takes a long time or years to change

Final answer:

Local conditions like temperature, atmospheric pressure, wind, and humidity determine the weather in an area, which refers to short-term atmospheric conditions.

Explanation:

The combination of local conditions such as temperature, atmospheric pressure, wind, and humidity determines the weather in the area. Together, these are all components of weather, which refers to the atmospheric conditions during a short period of time. In contrast, climate is the statistical summary of these elements over long periods, affecting and defining the characteristics of a region or biome. Hence, the correct answer to the question is: D. the weather in the area.

Sound waves my dude

Sound waves and visible light require a medium to travel.

A disturbance or variation in a medium that transports energy from one point to another and can take the form of elastic deformation or a change in pressure, electric or magnetic intensity, electric potential, or temperature.

Sound waves need a medium, such as air, water, or solids, to propagate and be heard. They are caused by the vibration of a material and the transfer of this vibration through the medium.

Visible light also requires a medium to travel, although it can travel through a vacuum, such as space. In a vacuum, light travels at its fastest speed and does not encounter any resistance. In a medium, such as air, glass, or water, light travels more slowly and is refracted or bent.

Microwaves and X-rays do not require a medium to travel. Microwaves are a type of electromagnetic radiation that can travel through a vacuum, such as the space between the Earth and a satellite, as well as through solids, liquids, and gases. X-rays are also a type of electromagnetic radiation that can travel through a vacuum and penetrate materials that are opaque to visible light.

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The safety measures include wearing appropriate safety gear, slow and even heating, not leaving the experiment unattended, allowing the test tube to cool gradually after melting, and appropriate disposal.

Determining the melting point of naphthalene through a cooling curve requires adherence to numerous safety precautions. The most crucial is to use safety equipment appropriately, such as wearing protective goggles, a lab coat, and gloves. Secondly, you must ensure to heat the naphthalene slowly and evenly to prevent it from catching fire as it's flammable. Keep the surrounding area free from flammable materials. In case of a sudden increase in temperature or boiling, turn off the heat source immediately.

Lastly, never leave the experiment unattended. After the naphthalene has melted, let the test tube cool gradually, and do not immerse it in cold water, as it could shatter from thermal shock. Dispose of the melted naphthalene according to your school's laboratory safety protocols.

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Answer:

A. 98,000 J

Explanation:

The gravitational potential energy of an object is given by

U = mgh

where

m is the mass of the object

g is the gravitational acceleration

h is the heigth above the ground

In this problem,

m = 2000 kg

g = 9.8 m/s^2

h = 5.0 m

Substituting into the equation, we find

[tex]U=(2000 kg)(9.8 m/s^2)(5.0 m)=98,000 J[/tex]

Answer:

0 J

Explanation:

the object isn't moving, there is no kinetic energy. This question is worded poorly and made this not obvious.

Kinetic Energy = 1/2 * mass * velocity^2

Mass = 0.1 kg

Velocity = 20 m/s

Kinetic energy = 1/2 * 0.1 * 20^2

Kinetic energy = 1/2 * 0.1 * 400

Kinetic energy = 20 J

Answer: Shield volcano is a broad, gently sloping, explosive volcano which is comprised of basaltic magma.

Shield volcano is normally not explosive but if somehow water comes in contact with this basaltic magma, then it turns into a more violent, explosive volcanoes, producing pyroclastic materials such as lapilli, lava bombs and block.

An explosive eruption from a shield volcano can be caused by the trapping of gases in highly viscous magma, leading to a buildup of pressure and a violent explosion.

The eruption from a shield volcano can become explosive if there is a sudden release of trapped gases within the magma. This occurs when the magma is highly viscous, preventing the gases from escaping easily, and pressure builds up. Eventually, the pressure becomes too great and results in a violent explosion.

An example of an explosive eruption from a shield volcano is the 1790 eruption of Kilauea in Hawaii. The eruption sent ash, rocks, and gas high into the air, causing widespread damage and creating a large crater.

To summarize, an explosive eruption from a shield volcano can be caused by the trapping of gases in highly viscous magma, leading to a buildup of pressure and a violent explosion.

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Answer:

Negative feedback is a reaction that causes a decrease in function. It occurs in response to some kind of stimulus. Often it causes the output of a system to be lessened; so, the feedback tends to stabilize the system. This can be referred to as homeostatis.

Explanation:

The negative feedback of an endocrine system decreases the output and tends to maintain the stability of the system.

An internal messenger system that contains feedback loops of hormones released by the internal glands of an organism. These hormones go directly into the circulatory system to regulate distantly target organs.

Negative feedback is a part of the endocrine system. It is a reaction that causes a decrease in function. It occurs in response to some kind of stimulus. Often it causes the output of a system to be lessened; so, the feedback tends to stabilize the system. This can be referred to as homeostasis.

Thus, we can conclude that the negative feedback of an endocrine system decreases the output and tends to maintain the stability of the system.

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Answer:

The definitive and unifying theme or idea of a story or article. It encompasses all the aspects necessary to create a coherent main idea. The central idea is typically expressed as a universal truth or theme that is built and supported by the setting and characters in a story.

Explanation:

This is the correct answer to your question.

Hope this helps!!!

Kyle.

Answer:

A series circuit

Explanation:

A circuit that has only a single path for current to flow through is best classified into which category?

a series circuit

an open circuit

a parallel circuit

a short circuit

Explanation:

The reason that A ( a series circuit ) is the answer is because in a series circuit, it only allows for current to flow in one single path.

Answer: A series circuit

Explanation: A circuit that has only a single path for current to flow through is best classified into which category?

Answer:

73/35 Br

Explanation:

The symbol for a bromine isotope with 35 protons and 38 neutrons corresponds to the acronym used to represent bromine, with the atonic number on the left side of this circle in the upper corner and the mass number on the left side of this acronym in the lower corner.

The number is the number of protons, in this case the atomic number is 35. The number of the mass is the sum between the number of protons and the number of neutrons, which in this case is 35 + 38 = 73. The acronym that corresponds to bromine is "Br".

With that, we can conclude that the correct symbol would be 73/35 Br

The answer true I’m guessing. It’s a 50/50 chance

Answer: The trough is the lowest point of a wave while the crest is the highest point of a wave.

Answer:

It allows a mobile phone to store data

Answer:

store data

Explanation:

Answer: Multiply Both Volume And Density

Explanation: Multiply the volume and density together. Multiply your two numbers together, and you'll know the mass of your object.Keep track of the units as you do this, and you'll see that you end up with units of mass (kilograms or grams).

For this case we have by definition, Newton's second law of motion states that the force is directly proportional to the mass and to the acceleration of a body. That is to say:

[tex]F = m * a[/tex]

Where:

F: It's the strength

m: It's the mass

a: It's the acceleration

ANswer:

[tex]F = m * a[/tex]

Answer:

Explanation:

There seems to be a typo in the problem statement.  It says the spring stretches to a shorter length after more mass is added.  Please check the problem statement.  I'm going to do the calculations assuming that the first length should be 11.80 cm and the second length should be 12.05 cm.

Hooke's law states that the force needed to compress or extend a linear spring is:

F = kΔx, where k is the stiffness and Δx is the displacement.

When a 20g object is placed in the pan, the spring stretches to a length of 11.80 cm.  The force of the spring is counteracting the weight of both the pan and the object. Therefore:

(m + 0.020) g = k (0.1180 - 0.100)

And when another 30g object is placed in the pan, the spring stretches to a length of 12.05 cm.

(m + 0.020 + 0.030) g = k (0.1205 - 0.100)

We now have two equations and two variables.  If we divide the second equation by the first equation:

(m + 0.050) / (m + 0.020) = (0.1205 - 0.100) / (0.1180 - 0.100)

(m + 0.050) / (m + 0.020) = 0.02050 / 0.0180

0.0180 (m + 0.050) = 0.02050 (m + 0.020)

0.0180 m + 0.0009 = 0.02050 m + 0.00041

0.00049 = 0.0025 m

m = 0.196

The pan has a mass of 0.196 kg, or 196 g.

Answer: it is bad for you and can cause some crazy brain dammage and this could potentially end you life because it is harmful :p

Mechanical Advantage = (output force) / (input force)

Mechanical Advantage = (1300 N) / (50 N)

Mechanical Advantage = 26

The mechanical advantage of pulley is that with less applied force we can get large amount of work.

To find the answer, we need to know about the pulley system.

A pulley system is a wheel on an axle or shaft which is designed to support the movement and change the direction of a taut cable or belt, or transfer the power between the shaft and cable or belt.

In a pulley system, we get a huge amount of force from a less amount of applied force.

Thus, we can conclude that the mechanical advantage of pulley is that with less applied force we can get large amount of work.

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Answer:

= 10 g

Explanation:

Half life is the time taken by a radioactive substance to decay by half of the original mass or initial amount.

Therefore, to get the new mass after decay;

New mass = Original mass × (1/2)^n ; where n is the number of half lives.

n = 60 seconds/20 seconds

  = 3

Therefore;

New mass = 80 g × (1/2)^3

                   = 80 g × 1/8

                   = 10 g