how much chemical energy must be supplied to a car engine if we want it to produce 5000J of kinetic energy and it is 45% efficient

C is the correct answer. Opposites attract!

In choice C, the two magnets are closer together so it wouldn't have much attractive force. Whereas, in choice D, the two magnets are further apart so it might have the greatest attractive force.

If I were you, I would choose D, but I suck at school so it probably isn't D.

Answer;

The above statement is True

Kinetic friction is affected by the weight of the object.

            F= coefficient of friction * Normal force.

              F = mass* acceleration due to gravity.

Answer:

The answer is True. Friction is indeed affected by weight.

Explanation:

A.) Electromagnetic Current

please mark me as the brainliest

According to the Law of Universal Gravitation (applying to all things in the universe, hence "universal"), all objects attract each other through gravitational force. ... As mass increases, gravity increases (related linearly) because there is a stronger attraction between objects with more "stuff" (matter).

Velocity = (displacement) / (time)

Displacement = straight-line distance between start-point and end-point

If you stop at the same point you started from, then your displacement for the trip is zero.

The answer is A

Velocity = (displacement) / (time)

Displacement = straight-line distance between start-point and end-point

If you stop at the same point you started from, then

your displacement for the trip is zero, and your average

velocity is also zero.

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Final answer:

Builders should be concerned about erosion, mass wasting, and slope instability when constructing homes on cliffs, with particular risks including landslides and tsunamis arising from geological vulnerabilities and ocean dynamics.

Explanation:

The builder of a house on a cliff overlooking the ocean should be concerned about geologic phenomena such as erosion and mass wasting processes. Ocean waves incessantly weather away at the land, creating sea cliffs that become prime areas for concerns about stability. Particularly, the undercutting action of the sea can lead to portions of the cliff collapsing, and additional mass wasting can occur as higher rocks calve off. Notably, the construction of buildings on steep slopes can influence nearby slope instability due to changes in drainage, which further compounds these concerns.

Geologic factors such as rock bedding, fracturing, and foliation are structural weaknesses that can be exacerbated by this process, increasing the risk of landslides. Furthermore, when building in coastal areas, one must also consider the potential risk from tsunamis, such as the hypothesized collapse of volcanic island slopes that could generate massive waves. Thus, attention to elements like coastal erosion, wave-cut platforms, and tectonic activity is crucial during the planning and building phase to mitigate potential disasters.

I think the true option is "The sun uses its own matter to create light and heat."

Answer:

 - The sun uses its own matter to create light and heat.          

Explanation:

Sun is composed of gases majorly Hydrogen and Helium. In the core, the hydrogen atoms fuse to form helium atoms. This nuclear fusion reaction in the core produces huge amount of energy in the form of heat and light.

Thus, the statement that sun uses its own matter to create light and heat is true.

Sun is a G2 star. It is not a rare star. It is appears extremely bright because it is closer to earth. Else, it has a average brightness.

When we look at the sun, we actually view the photosphere. chromosphere is only visible during a total solar eclipse.

The sun would eventually die and in this process, it would become red giant expand and engulf the earth. Finally its core would form a white dwarf.

Answer:

A) Alpha particle

Explanation:

An alpha particle is identical to a helium nucleus, since consists of 2 protons and 2 neutrons.

The charge of an alpha particle is +2e and its mass is 4 a.m.u.

Alpha particles are produced in alpha decays. Alpha decays occur when a nucleus emits an alpha particle: as a result, the atomic number of the nucleus decreases by 2 units, while its mass number decays by 4 units.

The equation that represents an alpha decay is

[tex]_Z^AX \rightarrow _{Z-2}^{A-4}Y+_2^4 \alpha[/tex]

One

d = 400 m

t =   20 s

speed = ?

speed = 400 / 20

speed = 20 meters/second

Two

d = 50 meters

t =  10 seconds

speed = 50 meters / 10 seconds

speed = 5 meters / second

it will weigh less on the moon.

ANY object will weigh  83% less on the Moon than weighs on Earth.

Your 10kg rock weighs  98N (22.4 lbs)  on Earth and  16N (3.6 lbs)  on the Moon.

It should be the first answer. I'm sorry if it's wrong

Coal production is costly because coal is found deep underground, necessitating expensive mining operations. Corrent answers are 1.coal is found deep underground, 2. Coal is expensive to make and  3. Coal is only found in certain places on earth.

Coal production is costly primarily because coal is found deep underground. This necessitates extensive and expensive mining operations to extract the coal.

There are two main methods of coal mining:

Furthermore, transporting the mined coal to power plants or industrial sites adds to the cost. Lastly, coal processing, which involves cleaning and removing impurities, adds another layer of expense.

Corrent answers are 1.coal is found deep underground, 2. Coal is expensive to make and  3. Coal is only found in certain places on earth.

Explanation:

Given that,

Input force on a simple machine, F = 2 N

The output force on a simple machines, F' = 4 N

The ratio of the output force to the input force of any simple machines is called its mechanical advantage. Mathematically, it is given by :

[tex]m=\dfrac{F'}{F}[/tex]

Putting the value of F and F' in above equation. We get :

[tex]m=\dfrac{4}{2}[/tex]

m = 2

So, the mechanical advantage of the simple machines is 2. Hence, this is the required solution.

Answer:

Mechanical advantage, m = 2

Explanation:

Given that,

The input force on a simple machine, [tex]F_i=2\ N[/tex]

The output force on a simple machine, [tex]F_o=4\ N[/tex]

To find,

The mechanical advantage of the simple machine.

Solution,

The ratio of the output force to the input force of any simple machines is called its mechanical advantage. Its expression is given by the below formula :

[tex]m=\dfrac{F_o}{F_i}[/tex]

[tex]m=\dfrac{4}{2}[/tex]

m = 2

Therefore, the mechanical advantage of the simple machines is 2.

A is the correct answer

The large container warms slower than the smaller container because of the amount of space . Both can warm to the same temperature tho just one takes longer than the other . Can I please be marked as brainliest! Have a great day !

The larger container warms up slower than the small one

Sound waves are longitudinal wave which propagates in form of compression and rarefaction through the medium

As the medium is have compression and rarefaction then we will have few positions in the medium where we have pressure maximum and few points of less pressure.

this pressure difference creates disturbance into our ear drum and this disturbance or this signal is convey to brain as sound.

The transmission of this signal is always in form of electrical signal which are carried by neurons into our brain

Answer:

A. Electrical signal waves

Explanation:

Answer:

correct order of work done is given as

2 > 3 > 4 > 1

Explanation:

When positive charge is dragged opposite to electric field then in that case work done is positive while if negative charge is dragged opposite to electric field then the work done is negative

So here we will have

positive work for charge 2, 3 and 4 while for negative charge particle 1 the work done is negative

now here we also know that work done is product of force and displacement

so here work depends on displacement of charge particle

maximum displacement is force particle 2

minimum is for particle 4

so correct order of work done is given as

2 > 3 > 4 > 1

Answer:

2, 3, 4, 1

Explanation:

on edg

Courtney should carry out an acid-base titration, adding a known concentration of an acid or base to the unknown solution until neutrality is achieved, indicated by a colour change in an indicator or a pH measurement. Acids produce H3O+ or H+ ions, while bases produce OH- ions. The volume of known solution added to reach neutrality can help determine the nature and strength of the unknown solution.

For Courtney to determine whether an unknown chemical solution is an acid or a base, she should perform an acid-base titration. In this process, a solution of an acid or base with a known concentration, often referred to as the titrant, is slowly added to the solution with an unknown concentration, the analyte, until neutrality has been achieved. Indicator substances such as phenolphthalein, which changes colour based on pH, or a pH meter can be used to determine when this point of neutrality, called the equivalence point, has been reached.

For instance, if Courtney had a known concentration of sodium hydroxide (NaOH), a base, she would add this to the unknown solution until her phenolphthalein indicator changes colour, indicating all the acid in the solution had been neutralised. The amount of NaOH added helps determine whether the unknown solution was acidic, and to what degree.

It's important to remember that acids produce H3O+ or H+ ions in a solution, while bases produce OH- ions. This knowledge can also aid in further understanding of the titration results.

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Gamma rays have extremely shorter wavelengths than microwaves and therefore have higher frequencies.

Gamma rays have a higher frequency than microwaves. In the electromagnetic spectrum, the frequency and energy increase from radio waves to gamma rays. Gamma rays are the most energetic, and microwaves are on the lower energy end of the spectrum.

Gamma rays have a higher frequency than microwaves. In the electromagnetic spectrum, frequency and energy increase from radio waves to gamma rays, making gamma rays the most energetic form of electromagnetic waves. Simply put, gamma rays' frequency is higher and their wavelength is shorter than microwaves.

Microwaves are on the lower energy end of the spectrum, used in applications such as cooking and telecommunications. They have a frequency ranging from about 10⁹ Hz to 10¹² Hz.

Shortly, gamma rays are nuclear in origin and encompass the highest-frequency electromagnetic radiation of any type, meaning they have a higher frequency than microwaves.

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-45N because you add the side together and make it equal 0

Kiley and Germaine pull together, resulting in a force of 45N which pulls the rope that way ===> .

In order to balance the forces on the rope, Gunther must pull the rope with a force of 45N this way  <===, all by himself.

The net force on the rope will then be zero, and the rope will not accelerate.  (Although the tension inside the rope will be 90N.)

By the way . . . I'd love to see how the kids manage to all get on the "sides" of the rope.  I would have expected them to just do it the easy way and stand at the "ends" of the rope.

Answer

Hello,

This is a double replacement reaction.

Explanation

A double replacement reaction occurs wherein the two principle reactants exchange after reaction. In this example, Cl will combine to K to form KCl and H will add to OH to form H2O.The cations and anions switch between the reactants to produce new products.

Wish you Luck!

If you're referring to this question :

A container of soymilk has the instruction on its label to "shake well before opening." The soymilk is most likely a !suspension!

Suspension is the answer.

Hope this helps,

Davinia.

What does "which" mean ?  Does it mean to pick the right one out of a list that you're hiding from us ?

There's no way we can begin to make a choice if we don't know WHAT the samples are samples OF.

I CAN give you some info, however, that will probably help you make the right choice from the hidden list that you have.

If water is on the list, then that's the answer, EXCEPT if liquid ammonia is on the list.  Liquid ammonia is the only known substance on Earth that beats water as the answer to this question.

If neither liquid ammonia NOR water is on your secret list of samples, then you're on your own, Bunky.

Answer: if you are on usa test prep the answer is aluminum

Explanation:

Answer:

The windowpanes are- transparent.

The color of the panes are due to the wavelengths of light that the glass- allows to pass through

Explanation:

Just answered the question.

Answer:

The two answers are:

Explanation:

1) transparent

2) allows to pass through

I also just did this question. No lie. I hope this helps!

- sincerelynini

c the objects particles move faster

Answer: c.The object’s particles move faster

Explanation:

When the temperature of an object increases, the particles of that object gain kinetic energy and move faster.

Kinetic energy is related to motion. If an object has multiple particles, as faster they move, they will collision with each other.

So, the speed of the particles is related to the temperature. (And also the mass of the particle)

The theory is A. continental drift.

The lithosphere which is the outermost layer of the planet is broken into pieces called tectonic plates. In this scientific theory called plate tectonics, seven large and greater number of small plates are broken and moved separately. This theory is based on the concept of continental drift.  

In the geologic time, continents shift their position from the earth's surface. Similar fossils found on different continent's shores prove us that the continental drift is nothing but truth.

Answer:

[tex]1.66\cdot 10^5 Pa[/tex]

Explanation:

The ideal gas equation states that:

[tex]pV=nRT[/tex]

where

p is the gas pressure

V is the gas volume

n is the number of moles of the gas

R is the gas constant

T is the absolute temperature of the gas

For the gas in this problem, we have:

[tex]n = 3 mol[/tex] (number of moles)

[tex]V=60 L=60\cdot 10^{-3} m^3[/tex] (gas volume)

[tex]T=400 K[/tex]

So we can solve the formula for p, the pressure of the gas:

[tex]p=\frac{nRT}{V}=\frac{(3 mol)(8.314 J/mol K)(400 K)}{60\cdot 10^{-3} m^3}=1.66\cdot 10^5 Pa[/tex]

Answer:

B. 14

Explanation:

For an element:

- Atomic number: is the number of protons in the nucleus (p)

- Mass number: it is the number of protons (p) + neutrons (n) in the nucleus

For Al (aluminium), we have:

p = 13

p + n = 27

Substituting the first equation into the second one, we find the number of neutrons:

n = 27 - p = 27 - 13 = 14

Answer:

14

Explanation:

plato

Answer: False

Explanation:

Observation is a detailed record of the data obtain after the implementation of the scientific procedure. It does not include the description of the subject as it is already mentioned in the literature review or writing theory or principle of the scientific research or experiment.

If I can't open the lid of a jelly jar, I'd keep trying and if I can't open the lid of a jelly jar after the MANY tries I took, I'd ask for help.

Hit in the center of the top, and it will let some air out, that will make it easier.

The horizontal motion has no effect on the vertical drop.

From a drop, the distance the ball falls in 'T' seconds is

D = 4.9 T^2

so

2.2 = 4.9 T^2

T^2 = 2.2/4.9

T^2 = 0.449 sec^2

T = 0.67 second

We have that A ball is thrown horizontally at a height of 2.2 meters at a velocity of 65m/s off a cliff. Assuming no air resistance will take t to reach the ground

t=0.670sec

From the question we are told that

A ball is thrown horizontally at a height of 2.2 meters

a velocity of 65m/s off a cliff

Generally the equation for the Time is mathematically given as

s=ut+1/2gt^2

Therefore

[tex]2.2=0t+1/2(9.8)t^2\\\\t=\sqrt{\frac{2.2}{0.5*9.8}}\\\\t=0.670sec[/tex]

Therefore

A ball is thrown horizontally at a height of 2.2 meters at a velocity of 65m/s off a cliff. Assuming no air resistance will take t to reach the ground

t=0.670sec

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