15. a- if an Lithium (atomic number 3) atom has a -2 charge, how many electrons does it have? - Why do you do it this way? - Is this an anion or a cation? d- Why?
A-
B-
C-
D-
PLEASE HELP THANK YOU :)​

The angle of repose for fine sand is 35 degrees.

The ground motion in a Richter magnitude 7 earthquake is 10,000 times larger than in a Richter magnitude 4 earthquake. The angle of repose for fine sand is typically around 34 degrees. This can vary slightly, but it should be accurate within 2 degrees.
The ground motion in a Richter magnitude 7 earthquake is 1,000 times larger than in a Richter magnitude 4 earthquake. This is because each whole number increase on the Richter scale corresponds to a 10-fold increase in ground motion.

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Scientists believe that light is made of streams of particles, called photons, because of their observed behavior. In certain experiments, such as the photoelectric effect, it was found that light behaves more like a particle than a wave. For example, light can knock electrons out of atoms, which would require a particle-like behavior. Additionally, the energy of each photon is directly proportional to its frequency, which is a characteristic of particles. The behavior of light in other experiments, such as the double-slit experiment, can also be explained by the wave-like behavior of photons. Therefore, scientists have concluded that light has both particle and wave-like properties, known as wave-particle duality.

While this answer may provide helpful information for your assignment, it is important to remember that using it verbatim could be seen as plagiarism. To avoid this, it is best to use your own words and properly cite any sources used. This will ensure that you are giving credit to the original author and presenting your own unique perspective on the topic.

~~~Harsha~~~

Explanation:

The relation between potential difference, current and resistance flowing in a circuit is given by using Ohm's law. It can be given by :

V = IR

\(I=\dfrac{V}{R}\)

Resistance opposes the flow of electric current in the circuit. It means that, if resistance is more, less current will flow through the circuit.

7. a) The bulbs will not light up in Circuit B when the switches are closed.

b) To correct the problem, the wire connecting the two switches in Circuit B should be moved to connect the two bulbs in parallel, as shown in Circuit A.

A closed circuit is a complete and continuous path of an electric current through a conducting wire that permits electrical energy to be transmitted from a power source to an electrical device.

In a closed circuit, current flows from the power source to the electrical device and back to the power source. An open circuit, on the other hand, arises when there is a gap in the circuit that prevents current from flowing.

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Answer:

Cant say for sure, its been a while sense ive done this, but im almost certain its 70

Explanation:

Take the zero off of your 10 s

Then go 7 m/s x 1 s

Which equals 7

Add the zero back to the end of your answer

10 -- 0 = 1 x 7 = 7 ++ 0 = 70

(PS, two of the same sign is just adding a number to the end of your original answer, that is not what it actually stands for in mathematical terms but that is what i'm using to make it clearer as to whats happening)

I'm not too good at explaining and formulas but i hope this helped

The square of the magnitude of the sum vector IA + BI is (IA + BI)•(IA + BI) = IA•IA + 2IA•BI + BI•BI.

The square root of the sum of the squares of a vector's components can be used to determine its magnitude. The square of the magnitude of vector IA + BI can be expressed as:

(IA + BI)•(IA + BI) = IA•IA + 2IA•BI + BI•BI

where the dot (•) represents the dot product of two vectors. Vector can be added, subtracted, and multiplied by scalars to perform various mathematical operations. They are widely used in physics, engineering, and computer graphics to describe and analyze physical quantities such as velocity, force, and acceleration. Vectors can be represented graphically as directed line segments, or mathematically as ordered pairs of real numbers. In the latter representation, vectors can be added component-wise, and the magnitude of a vector can be calculated using the Pythagorean theorem.

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Explanation:

In recent times of pandemic, robots can be use as replacement of labor in the industries. Mundane tasks can be programmed in their system so that they can used readily.

Drones can used delivery for essential goods and services, so that human interference can be least and the spread of virus can be curbed.

In a recent example, Argentina where aerial data has reportedly been used to accelerate the construction of emergency hospitals.

The minimal starting height necessary, in terms of the radius of the loop (r), for the marble to just clear the loop is r/(1 - v²/2rg).

To find the minimal starting height necessary for the marble to just clear the loop, we'll use the principle of conservation of energy. Mathematically solving for the minimal starting height necessary, in terms of the radius of the loop (r), for the marble to just clear the loop: At the top of the loop, the potential energy of the marble equals the kinetic energy at the bottom of the loop.Since there is no friction, the energy is conserved. The potential energy of the marble can be given as:

P = mgh

Where, P = potential energy of the marble, m = mass of the marble, h = height of the marble above the ground, g = gravitational acceleration.

In order for the marble to just clear the loop, the centripetal force must be equal to the gravitational force acting on it.So, we have:

mv²/r = mg

where,v = velocity of the marble, r = radius of the loop, g = gravitational acceleration, m = mass of the marble. On solving the above equation, we get:

v² = gr

Hence, the kinetic energy of the marble can be given as:

K.E. = ½ mv²

Using conservation of energy, we have:

P.E. at the highest point = K.E. at the lowest point

mgh = ½ mv²

So, the height of the marble above the ground at the highest point can be given as:

h = v²/2g

The radius of the loop is r. So, we have:

r = h + hr = v²/2g + r

So, we can solve for the minimal starting height necessary, in terms of the radius of the loop (r), for the marble to just clear the loop.Solving for h in the above equation, we get:

h = r/ (1 - v²/2rg)

Thus, the minimal starting height necessary, in terms of the radius of the loop (r), for the marble to just clear the loop is r/(1 - v²/2rg).

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Answer:

v= 4 m/s

Explanation:

Momenutm is, by definition, the product of mass and velocity.

\(p = mv\)

Let's replace what we know and solve for whatever's left

\(100 kg\cdot m/s = 25kg \cdot v \rightarrow v= 4 m/s\)

Answer:

Explanation:

Performing physical activities helps to build a healthy relationship with yourself, in the sense that physical activity promotes health at all levels. Health is a set of physical, mental and social well-being, so physical activity reaches all these levels and increases the quality of life for a person as a whole.

There are several types of physical activities that can be performed and you can choose the one that best fits your preferences and routine. A walk for example can be done in any safe place and at any time and it already helps in improving physical conditioning, in receiving serotonin and endorphins, in reducing blood pressure and protecting the heart and in improving mental health.

So the ideal is for each person to set their own goals in relation to their health and seek to achieve them, either to have a better quality of life, to socialize more with people, to prevent diseases, etc.

Physical exercise helps build relationship by:

This is known to be any physical activities such as walking, running, etc., that is often done so as to keep the body fit.

It is very important when as it helps one to maintain a good balance of mental health. As a person moves their body, there is the release of endorphins that functions to make us feel good and helps handle the effects of stress and anxiety. The more a person exercise, the less mental health cases and more happier relationships.

Note that Values are the drive force of  your actions and they push or motivate as you set your life goals. They help to eliminate any obstacle in term of foreign ideas that are against one's value and it keeps one's focus on the goal.

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Answer:

Explanation:

The pressure exerted by the elephant can be found by using the formula

\(p = \frac{f}{a} \\ \)

f is the force

a is the area

From the question we have

\(p = \frac{2400}{0.8} \\ \)

We have the final answer as

Hope this helps you

Answer: The watermelon

Explanation: The watermelon has a larger mass than the rest of the three.

Answer:

The magnitude of the force acting on the sled is 60.5 newtons.

Explanation:

The Work-Energy Theorem states that the work done by the external force applied on the sled (\(W\)), in joules, is equal to the change of its translational kinetic energy (\(\Delta K\)), in joules:

\(W = \Delta K\) (1)

By definitions of work and translational kinetic energy we expand the equation above:

\(F\cdot s = \frac{1}{2}\cdot m\cdot (v_{2}^{2}-v_{1}^{2})\) (1b)

Where:

\(F\) - External force applied on the sled, in newtons.

\(s\) - Travelled distance, in meters.

\(v_{1}, v_{2}\) - Initial and final velocities, in meters per second.

If we know that \(m = 11\,kg\), \(v_{1} = 4\,\frac{m}{s}\), \(v_{2} = 7\,\frac{m}{s}\) and \(s = 3\,m\), then the external force applied on the sled is:

\(F = \frac{m\cdot (v_{2}^{2}-v_{1}^{2})}{2\cdot s}\)

\(F = \frac{(11\,kg)\cdot \left[\left(7\,\frac{m}{s} \right)^{2}-\left(4\,\frac{m}{s} \right)^{2}\right]}{2\cdot (3\,m)}\)

\(F = 60.5\,N\)

The magnitude of the force acting on the sled is 60.5 newtons.

I'm not sure if you meant to add a attachment but here is how a trolley works.

A trolley is a small car that is moved along a set of tracks by pulling on a rope or cable. The trolley consists of a simple frame that is mounted on wheels, and it may be powered by an electric motor or a simple hand-crank. The wheels are designed to run along the track smoothly, and the trolley is guided by the shape of the rails. The cable that powers the trolley is typically supported by a system of pulleys and gears, which help to distribute the force evenly between the trolley and the cable. This allows the trolley to move smoothly and quickly along the track, without slipping or losing traction. The power source for the trolley may be located at one end of the track, and the trolley operator pulls or releases the cable to control the speed and direction of the trolley. Alternatively, the trolley may be powered by an electric motor located on the trolley itself, which can be controlled using a simple switch or remote control. Regardless of the power source, the trolley is a simple and effective way to move people or goods from one place to another along a fixed path.

Convection is a method of heat transfer that occurs when fluids (liquids or gases) are heated and the resulting motion of the fluid carries heat from one location to another.

What is convection?

A thermometer measures an average kinetic energy of a substance - Correct

Heat is a form of energy - Correct

Convection occurs only in liquids and gases - Incorrect (Convection can occur in both liquids and gases, but it can also occur in solids).

All substances radiate heat- correct

Our body temperature is always equal to the temperature around us - Incorrect ( the body can be influenced by the external temperature, it is not always equal to it and has its own mechanisms to regulate its internal temperature), Heat flows from a colder substance to a hotter substance - Correct (This is the second law of thermodynamics). It occurs due to the density differences in a fluid caused by temperature variations. As a fluid is heated, its density decreases, causing it to rise. Cooler fluid, which is denser, then flows into the region left by the rising warm fluid, and the cycle repeats, creating a convection current.

There are two main types of convection: Natural convection, which occurs in the absence of any external forcing. Forced convection, where an external force, such as a pump or a fan, is used to drive the fluid motion and enhance heat transfer.

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the magnitude of the flux through the surface produced by the magnetic field B⃗ is approximately 0.00893 Wb.

To calculate the magnitude of the flux through the surface produced by the magnetic field B⃗, we can use the formula:

|Φb| = ∫∫ B⃗ · dA⃗

Given that the surface is a flat, square surface in the xy-plane at z=0, we can represent the surface area vector dA⃗ as pointing in the positive z-direction.

dA⃗ = dxdy(0i^+0j^+1k^) = k^ dxdy

Since the surface is a square with side length 4.20 cm, we can set up the integral as follows:

|Φb| = ∫∫ B⃗ · k^ dxdy

Integrating over the surface, we have:

|Φb| = ∫(from 0 to 4.20 cm) ∫(from 0 to 4.20 cm) Bz dxdy

Plugging in the values of Bz = -0.475 T, we get:

|Φb| = ∫(from 0 to 4.20 cm) ∫(from 0 to 4.20 cm) (-0.475 T) dxdy

Evaluating the integral, we find:

|Φb| = (-0.475 T) * (4.20 cm) * (4.20 cm)

Converting the units to webers (Wb), we use the conversion factor 1 T·m² = 1 Wb, and convert the square centimeters to square meters:

|Φb| = (-0.475 T) * (4.20 cm) * (4.20 cm) * (1 m² / 10,000 cm²)

Simplifying the calculation, we find:

|Φb| ≈ 0.00893 Wb

Therefore, the magnitude of the flux through the surface produced by the magnetic field B⃗ is approximately 0.00893 Wb.

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Answer:

400m

Explanation:

From Newton's law of motion;

S = ut + 1/2 at2

Where U is initial velocity

a is acceleration

t is velocity hence;

S is distance covered

S = 20×10 + 1/2 × 4×(10)^2

= 200 + 200 = 400m

The values for the acceleration needed to complete the table are

We can complete the table by simply obtaining the acceleration where necessary. Details below:

Case 1

Net force = mass × acceleration

Acceleration = Net force / mass

Acceleration = 5 / 2.5

Acceleration = 2 m/s²

Case 2

Net force = mass × acceleration

Acceleration = Net force / mass

Acceleration = 2.32 / 12

Acceleration = 0.19 m/s²

Case 3

Net force = mass × acceleration

Acceleration = Net force / mass

Acceleration = 18.2 / 1.967

Acceleration = 9.25 m/s²

Case 4

Net force = mass × acceleration

Acceleration = Net force / mass

Acceleration = 0.87 / 21.2

Acceleration = 0.04 m/s²

Case 5

Net force = mass × acceleration

Acceleration = Net force / mass

Acceleration = 180 / 1.793

Acceleration = 100.39 m/s²

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Clear question:

See attached photo

Hair density is a term used to describe the amount of hair follicles on an individual's scalp. It ranges from thick to thin, with some people having a higher number of follicles per unit area than others. To measure hair density, experts typically use a metric known as "hairs per square A. inch."

This measurement is taken by counting the number of hair follicles present in a given area of the scalp, usually around the crown or vertex. The number of hairs present in this area can vary depending on factors like genetics, age, and health.
While hair density can be affected by various factors, it is generally considered to be an inherited trait. People with thick, dense hair often have a higher number of hair follicles per square inch, while those with thinner hair may have fewer follicles.
In addition to genetic factors, other factors that can affect hair density include stress, hormonal changes, and certain medical conditions. Hair loss, for example, can lead to a decrease in hair density over time.
Overall, measuring hair density per square inch is an important way for hair experts to assess an individual's hair health and determine the best course of treatment for any hair-related issues they may be experiencing.

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The electric power consumed by the household appliance is determined as 22 watts.

The electrical power consumed by the household appliance that is operating on 110 volts and whose electricity is flowing with a current of 0.2 amperes is calculated as follows;

P = IV

where;

P = 0.2 A  x  110 V

P = 22 W

Thus, the electric power consumed by the household appliance is a function of current and voltage.

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Answer:

C

Explanation:

Rusting is a different material other than steel, (Basically the steel is no longer steel and rust can't be undone, ((chemical change)))

Steel becomes rust depicting a chemical change. Therefore, option (C) is correct.

A chemical change can be described as a change in which a chemical substance is converted into one or more different kinds of substances. Chemical changes take place via the process of chemical reactions leading to the formation of different properties.

Chemical changes can be described as irreversible and also known as permanent in nature where an entirely new substance is formed. In steel, rust is invasive as well as corrosive, eating or etching the metal.

When acidic materials including water come in contact with metals, such as iron or steel, rust starts to form. Rust can be the result of corroding steel after the iron particles have been exposed to oxygen and moisture such as humidity, vapor, and immersion.

Therefore, the stell gets rust is a chemical change.

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The true statements are:Jupiter's Great Red Spot is in the southern hemisphere.The fastest wind speed recorded in our solar system is on Neptune.

Among the given statements, only two are true. Jupiter's Great Red Spot, a massive storm, is indeed located in the southern hemisphere of the planet. The Great Red Spot is a prominent feature on Jupiter, visible as a giant swirling storm system. On the other hand, the fastest wind speed recorded in our solar system, reaching speeds of up to 2,100 kilometers per hour (1,300 miles per hour), is found on Neptune.

The strong winds on Neptune contribute to its dynamic atmosphere and the formation of features like the Great Dark Spot. The remaining statements about Pluto, Saturn's moon Enceladus, and Uranus are not true according to our current understanding.

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The correct answer is B) strike-slip fault. It is the type of fault that has no vertical motion of rocks associated with it. Instead, the rocks move horizontally past each other, resulting in a side-to-side motion.

This type of fault does not involve any vertical motion of the rocks, and therefore has no associated vertical motion of rocks associated with it. Like shear faults, strike-slip faults also have no vertical motion of rocks associated with them. In a strike-slip fault, the rocks on either side of the fault move horizontally in opposite directions. This type of fault is also known as a 'lateral fault' since there is only horizontal movement along the fault plane.

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Answer:

well, hydropower is using fast-running water as a source of power to power machines or produce electricity, and using water can help make the earth a little cleaner, just like solar energy (energy from the sun). instead of using things like coal, oil, gas which is bad for the earth

Explanation:

B. The best classification for fossilized burrows dug by ancient clams is Trace Fossils.

A trace fossil, is a type of fossil record of biological activity but not the preserved remains of the plant or animal itself.

Some of trace fossils include the following;

Thus, the best classification for fossilized burrows dug by ancient clams is Trace Fossils.

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Sound waves with longer wavelengths tend to carry farther in air compared to waves with shorter wavelengths.

In air, sound waves with longer wavelengths have the ability to carry farther compared to waves with shorter wavelengths. This phenomenon occurs because longer wavelengths are less susceptible to scattering and absorption by the air molecules. As sound travels through the air, it interacts with the particles present, causing the energy of the wave to gradually dissipate.

However, longer wavelengths experience less interaction and, therefore, can propagate over longer distances before their energy diminishes significantly. On the other hand, waves with shorter wavelengths tend to disperse and lose energy more quickly due to increased interactions with air molecules. Consequently, it is the relatively long wavelengths that can carry sound over greater distances in air.

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The limiting reactant is the material that is in the shortest supply and will run out first, thus limiting the production of the bicycle. To determine the limiting reactant, we need to calculate how many bicycles we can make with each material:

a. With 5 frames, we can make a maximum of 5 bicycles.
b. With 10 seats, we can make a maximum of 10 bicycles.
c. With 16 wheels, we can make a maximum of 8 bicycles (since each bicycle requires 2 wheels).
d. With 20 pedals, we can make a maximum of 10 bicycles (since each bicycle requires 2 pedals).

Therefore, the limiting reactant is c. 16 wheels, as we can only make a maximum of 8 bicycles with this amount of wheels, even though we have enough of all the other materials to make 10 bicycles.

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Answer:

thanks

Explanation:

The correct order of events is, UCS -> UCR, NS + UCS -> UCR, CS -> CR.

Classical conditioning is a type of learning in which an organism learns to associate two different stimuli together. It involves the pairing of a previously neutral stimulus (NS) with a stimulus that naturally produces a response, known as the unconditioned stimulus (UCS).

The correct order of events for classical conditioning to occur is:

An unconditioned stimulus (UCS) occurs, creating an unconditioned response (UCR).

A neutral stimulus (NS) is repeatedly paired with the UCS.

Eventually, the NS becomes a conditioned stimulus (CS) when it elicits a conditioned response (CR) similar to the UCR.

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