Which is the best description of a molecule?
O Amolecule of an element is composed of at least two types of atoms.
O Amolecule of a compound is composed of only one type of atom.
O Amolecule of a compound is composed of at least two types of atoms.
O Amolecule of an element is composed of exactly two types of atoms.

Answers

Answer 1

A molecule of a compound is composed of at least two types of atoms.

Explanation:

The particle that are very smaller and are found in an element or a  compound  is called as molecule. The molecules have the compound's or the element's chemical properties. Chemical bonds links the molecules to stay together. Atoms are the things that makes up the molecule.

The atoms that are present are similar in the molecule of an element. A molecule of a compound contains at least two types of atoms. For example let us consider a compound water. this contains hydrogen and oxygen. In water there will be 2 hydrogen and one oxygen atom. Now let us consider an example of the molecule of an element which is an oxygen. this contains two atoms but they both will be oxygen.

Answer 2

Answer:

The answer to question is  A molecule of a compound is composed of at least two types of atoms.

Explanation:

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Related Questions

plsss help me asap

(03.05 LC)
Which statement best describes the long–term effects of using non–renewable resources? pls explain how u know

Select one:
a. Burning fossil fuels pollutes the environment.
b. Fossil fuels burn clean, reducing air pollution.
c. As populations increase, the need for solar power will decrease.
d. Resources will replenish over the long term to be used again.

Answers

Answer:b


Explanation:

Answer:

A.)

Explanation:

The answer would be A. because when they are burned, they release harmful pollution into the air causing the environment to be polluted by them.

It can't be B because it is saying the opposite which is false.

It is not C because solar power is a renewable resource not non-renewable like the question asked.

It is also not D because a non-renewable resource is one that cannot be replaced but this is saying that they can be replaced which is incorrect.

The answer would be A.

The speed at which an object falls and the acceleration at which it falls are
always the same value.
O
O
A. True
B. False

Answers

No, the speed at which an object falls is not equal to the acceleration at which it falls.

Answer:

Option B

Explanation:

Speed is defined as how fast an object can cover a specific distance and in what time it covers. So it is measured as the ratio of distance covered to the time taken to cover that distance. While acceleration is the rate of change of velocity. Moreover, speed is a scalar quantity and acceleration is a vector quantity. So most of the times, the direction will play an important role in the varying values of speed and acceleration. Also, acceleration of an object will depend upon the force and mass of the object. Thus, speed and acceleration will not attain same value always.

What type of mixture is salad dressing?​

Answers

Answer:

Heterogeneous Mixture

Explanation:

Heterogeneous by definition is when two different substance are mixed together, but they are not evenly distributed. In this case, the salad dressing is a Heterogeneous Mixture, for the dressing does not mix completely evenly throughout the salad.

~

How can electric shock be prevented?

Answers

Wearing rubber or stay away from water or/ and a conductor

what is thermal physics​

Answers

Answer:

Thermal physics is the combined study of thermodynamics, statistical mechanics, and kinetic theory of gases. This umbrella-subject is typically designed for physics students and functions to provide a general introduction to each of three core heat-related subjects. Other authors, however, define thermal physics loosely as a summation of only thermodynamics and statistical mechanics.

Explanation:

Final answer:

Thermal physics is a branch of physics focused on energy transfer and the behavior of particles in relation to heat, including study areas like thermochemistry and thermodynamics. It encompasses thermal agitation, heat transfer, and laws of energy conservation.

Explanation:

Thermal physics is an area of physics that deals with the energy transfer, thermal properties of materials, and the behavior of particles related to heat. It encompasses topics such as thermochemistry, the laws of thermodynamics, and thermal agitation. Thermal agitation refers to the random motion of atoms and molecules in any object with a temperature above absolute zero, resulting in the emission and absorption of radiation. In essence, thermal physics explores how thermal energy, or the kinetic energy of particles, flows and changes within systems. Thermal energy is a form of kinetic energy at the microscopic scale, crucial in understanding heat transfer, and how it influences work and energy conservation.

At the macroscopic level, thermal physics analyzes how heat transfer affects the internal energy of systems, aligning with Big Ideas from the AP Physics Curriculum Framework. Heat transfer describes energy movement from a hotter object to a cooler one, leading to temperature variations and potential work, exemplified by heat engines. Fundamental laws of physics, including the law of conservation of energy, govern these thermal interactions and their efficiencies.

A stunt man is attempting to ride his bike through the loop of a track. The
combined mass of the stunt man and his bike is 101 kg. (a) If the radius of
the loop is 10.1 m and he is traveling at 22.5 m/s, what is the normal force
from the track when he is at the top of the loop?
(b.) What is the minimum speed the stunt man can be traveling and still
make the loop?

Answers

Answer:

(a) 4070 N

(b) 9.95 m/s

Explanation:

(a) Draw a free body diagram of the stunt man when he is at the top of the loop.  There are two forces: normal force N pushing down and weight force mg pulling down.

Sum of forces in the radial (-y) direction:

∑F = ma

N + mg = m v² / r

N = m v² / r − mg

N = (101 kg) (22.5 m/s)² / (10.1 m) − (101 kg) (9.8 m/s²)

N = 4070 N

(b) At the minimum speed, there is no normal force at the top of the loop.

∑F = ma

mg = m v² / r

g = v² / r

v = √(gr)

v = √(9.8 m/s² × 10.1 m)

v = 9.95 m/s

how many neutrons are in calcium

Answers

Answer:

I believe there are 20 Neutrons in Calcium.

Explanation:

Final answer:

Calcium has several isotopes, with calcium-40 being the most common and containing 20 neutrons. The number of neutrons in an isotope of calcium can be found by subtracting the atomic number (20) from its mass number. Other isotopes like calcium-48 contain 28 neutrons.

Explanation:

To determine how many neutrons are in calcium, we look at its atomic number (Z) and its mass number (A). Calcium's atomic number is 20, which means it has 20 protons.

The most common isotope of calcium is calcium-40, which has a mass number of 40. To find the number of neutrons, we subtract the atomic number from the mass number:

Neutrons = Mass number - Atomic number = 40 - 20 = 20 neutrons

Therefore, calcium-40 contains 20 neutrons. There are other isotopes of calcium as well, such as calcium-48, which has 28 neutrons, and it is characterized by a half-life of about 2×10¹⁶ years, making it relatively stable.

When calcium forms a cation, such as Ca²⁺, it still retains its 20 protons and the number of neutrons does not change due to electron gain or loss. The resulting ion would have 18 electrons and carry a +2 charge.

John pushes his bed to the left overcoming the force of friction. On the free-body diagram below, which force represents the friction force on the bed?
A. Force A
B. Force B
C. Force C
D. Force D

Answers

Answer:

Force B

Explanation:

Friction Force

It's a force that appears when an object is tried to move on a rough surface. There are two cases: when the object is at rest, we have the friction static coefficient and when the object is already moving, we have the dynamic coefficient. The static coefficient is usually greater than the second because it's harder to overcome the friction when the object is at rest.

We are told that John pushes the bed to the left with enough force to overcome the force of friction. If the movement is intended to be to the left side, the friction force appears to the right, since it always opposes to the movement. Thus the force B is the one who represents the friction force in this situation

A football player kicks a 0.94 kg football with a force of 2.4 N.

Calculate the acceleration of the football as the player kicks the ball. Round your answer to the nearest tenth of a m/s2.

The acceleration of the football is
m/s2.

Answers

Answer:

The Answer is 2.6m/s(m/s)

Explanation:

Just took the test!

Answer:

2.6 m/s2............................

type 2 diabetes runs in familes, but its frequency has been rising in recent years. what factors might explain this increase in type 2 diabetes?

Answers

Answer:

poor diet andlack of exersise

Explanation:

A uniform brick of length 18 m is placed
over the edge of a horizontal surface with a
maximum overhang of 9 m attained without
tipping.
K18 m
Now two identical uniform bricks of length
18 m are stacked over the edge of a horizontal
surface.
K18 m
What maximum overhang is possible for
the two bricks (without tipping)?
Answer in units of m.

Answers

Answer:

13.5

Explanation:

x= Length

.5 = Center Point

x=0.5(9)= 4.5

So total length over the edge will be given as

Length (L) =9+4.5=13.5

Final answer:

The maximum overhang for two uniform bricks of length 18 m each, when stacked, is 13.5 m. This is determined by considering the center of mass and static equilibrium of the bricks.

Explanation:

The question involves the concept of static equilibrium and center of mass in the field of physics. When two uniform bricks of length 18 m are stacked and placed such that they overhang the edge of a surface, the maximum overhang is achieved when the center of mass of the system is still supported by the surface. To find the maximum overhang for two bricks, we can apply the principle of moments. For two stacked bricks, the bottom brick can overhang by half its length, namely 9 m. The top brick can be shifted further out but must keep its center of mass over the bottom brick. The maximal overhang of the second brick is therefore half of what remains from the first brick, which is ½ × 9 m = 4.5 m. Hence, the maximum overhang for the top brick is 4.5 m beyond the end of the bottom brick, which itself overhangs by 9 m. Consequently, the total maximum overhang for two stacked bricks is 13.5 m.

A 5 kg book rests on a table. How much force is it exerting on the table?
(Hint: think about acceleration due to gravity.)

Answers

Answer:

49N

Explanation:

Basically, think of this problem as asking how much the book weighs, as that is all weight is, how much force you exert on whatever surface you're on.

Thus, the force due to gravity Fgrav = mg = 5 * 9.8m/s^2 = 49N.

The force will be "49 N". A complete solution is provided below.

According to the question,

Mass of books,

m = 5 kg

We know the value,

g = 9.8 m/s⁻¹

Now,

The force exerting on the table, will be:

→  [tex]F = mg[/tex]

By substituting the given values in the above formula, we get

→      [tex]=5\times 9.8[/tex]

→      [tex]=49 \ N[/tex]

Thus the above answer is correct.

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6.
What is the speed of a rocket that travels 9000 meters in 12.12 seconds?

Answers

Answer:

742.57 m/s

Explanation:

Given:

Distance travels by a rocket = 9000 metres

Time taken by rocket = 12.12 seconds

Questioned asked:

Speed of rocket = ?

Solution:

By applying formula, speed = distance traveled divided by time taken

                                [tex]speed = \frac{distance}{time} \\ = \frac{9000}{12.12} \\ = 742.57m/s[/tex]

Therefore, the speed of a rocket that travels 9000 meters in 12.12 seconds is 742.57 meters per seconds.

1) Differences between Magnetic Induction and Demagnetization
2) A freely suspended bar magnet always shows north-south direction. Why?
3) A magnet has stronger force of attraction at the poles than in the middle. Why?
Please guys answer those questions in less than 24 hours.
I really need this answer.

Answers

1)

Magnetic Induction is the process by which an object is magnetized by an external magnetic field.

Demagnetization is the process of removing magnetism from an object.

Explanation:

Magnetism is the property of a material to exert a notice magnetic force on anything that is electrically or magnetically charged. Ferromagnetic substances like iron can be magnetized permanently by putting them in an external magnetic field. These materials retain their magnetic properties up to a certain temperature, called the Curie point.

Demagnetization is the process of decreasing the magnetic properties of ferromagnetic materials by heating it past the Curie point, applying a strong magnetic field, applying alternating current, or hammering the metal. Demagnetization occurs naturally over time.

Keywords: magnetism, magnetic induction, demagnetization, Curie point, ferromagnetic.

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2)

A freely suspended magnet always show north-south direction because Earth also shows magnetism.

Explanation:

Earth's magnetic field is similar to that of a bar magnet so it also have two poles; the south pole and the north pole. So when a bar magnet is freely suspended, it arranges itself in such a way that its north pole points towards the south pole of Earth and its south pole points towards the north pole of Earth. Because opposite poles attracts each other.

The south pole of earth's magnet is in geographical north because it attracts the north pole of suspended magnet . Similarly , the north pole of earth's magnet is in geographical south because it attracts the south pole of the suspended magnet . Hence, the suspended bar magnet shows north-south direction.

Keywords: north pole, south pole, magnet, Earth, bar magnet.

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3)

A magnet has stronger force of attraction at the poles than in the middle because the magnetic field lines of a bar magnet are closer at the poles while they almost vanish in the middle comparatively.

Explanation:

Magnetic field lines are used to represent the magnetic field around a magnet. Magnetic field lines are continuous, forming closed loops without beginning or end. They go from the north pole to the south pole. The direction of the magnetic force is tangent to the magnetic field line at that point.

The strength of the magnetic force is directly proportional to the density of the magnetic field lines. Hence, the magnetic force is stronger near the poles and weakens in the middle.

Keywords: magnetic field lines, poles, magnetic force.

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A baseball player runs 27 m from third base to home plate in 3.2 s. What is
his average velocity?

Answers

Answer:

8.4375m a second

Explanation:

Again, this is such an easy question that I see everywhere. The way to figure this out is to divided the total distance he or she covered, which was 27m, by the time it took him or her to do so, which was 3.2s, so the equation is 27 divded by 3.2 which is 8.4375.

Hope this helps and have a great day.

Answer:

8.44 m/s

Explanation:

Averag v = distance/time

= 27m/3.2s

= 8.44 m/secs

2. 30 Newton Meters of torque is required to close a door 1.5 meters wide. What force is needed to cause the
correct amount of torque?

Answers

Answer:

A

Explanation:

A 5.5 kg box is pushed across the lunch table. The net force applied to the box is 9.7N. What is the acceleration of the box?

Answers

Answer:

1.76 m/s^2

Explanation:

mass of box, m = 5.5kg

net force , F = 9.7N

acceleration = ?

F = m x a

a = F/m = 9.7/5.5

a = 1.76 m/s^2

If you wanted to be an auto mechanic for Toyota, where would you go to school to get that training? How much would you make your first year?

Answers

People interested in careers as Toyota mechanics should consider enrolling in one of the colleges or vocational schools offering the Toyota Motors' T-TEN program. T-TEN stands for Toyota Technician Training and Education Network. This program offers students training options ranging from a one-year professional certificate to a two-year associate's degree. This training may be a requirement for people who want to work for a Toyota dealership. Mechanics can enhance their credentials by completing the requirements of the T-TEN training program and passing the certification tests administered by the National Institute for Automotive Service Excellence (ASE). Automotive Service Technician / Mechanic at Toyota Dealership Salary. Median pay for Auto Mechanics at Toyota Dealership lies in the neighborhood of $16.24 per hour. The income range spans the entire spectrum between $11.48 per hour and $24.49.

Which type of change occurs when the bonds between atoms or molecules change and a new substance forms?
A: Permanent
B: Nuclear
C: Chemical
D: Physical

Answers

Answer:

C: Chemical

Hope this help !!!!

C. Chemical

~Sarah Robinsen

50200 J of heat are removed from
a block of ice, causing its
temperature to drop by 8.00°C.
What is the mass of the ice?
(Unit = kg)​

Answers

Correct Answer:

3.1375

Explanation:

Use equation [tex]Q=mc[/tex]Δ[tex]T[/tex] to find [tex]m[/tex]

Plug in all variables [tex]-50200=x\cdot 2000\cdot -8[/tex]

Answer: 3.1375

Final answer:

The mass of the ice block is approximately 3.01 kg, calculated using the relation Q = mcΔT with the values given and the specific heat capacity of ice.

Explanation:

To determine the mass of the ice based on the heat removed and the temperature change, we can use the following relation from thermodynamics:

Q = mcΔT

Where:

Q is the heat energy transferred (in Joules)m is the mass of the substance (in kilograms)c is the specific heat capacity (in J/kg°C)ΔT is the change in temperature (in °C)

For ice, the specific heat capacity (c) is approximately 2.09 J/g°C or 2090 J/kg°C. Plugging in the values, we have:

50,200 J = m × 2090 J/kg°C × 8°C

Solving for m:

m = 50,200 J / (2090 J/kg°C × 8°C) = ≈ 3.01 kg

Therefore, the mass of the block of ice is approximately 3.01 kg.

what are 2 examples of levers

Answers

Answer:

Some examples of levers include more than one class, such as a nut cracker, a stapler, nail clippers, ice tongs and tweezers. Other levers, called single class levers include the claw end of a hammer.

Explanation:

Answer:

Some examples of levers include more than one class, such as a nut cracker, a stapler, nail clippers, ice tongs and tweezers. Other levers, called single class levers include the claw end of a hammer.

Explanation:

Why should antibiotics be given to a person who is ill with a bacterial disease like strep throat, but NOT to a person who has a viral disease like measles?


Antibiotics kill bacteria but not viruses.

Antibiotics make viruses grow faster.

Antibiotics are made by viruses.

Viruses are not living things.

If you guys dont mind can you please help me with this one

Answers

Antibiotics only kill bacteria, not viruses. Therefore, the answer is A.

When you get the common cold, you can't take antibiotics to be cured. The common cold is a virus.

Answer:

b

Explanation:

antibiotics are made with viruses so that ou body can get immune to the virus

The landform pictured above has been growing taller from one year to the next. The picture shows
A.
a sand dune that has been formed by erosion
B.
a sand dune that has been formed by deposition.
C. a mountain that has been formed by crustal uplift.
D.
a mountain that has been formed by plate folding.

Answers

Answer:

a sand dune that has been formed by deposition.

Explanation:

The landform pictured above has been growing taller from one year to the next year. The picture shows a sand dune that has been formed by deposition. Thus, the correct option is B.

What are Sand dunes?

When the desert winds blow in a particular direction, they carry a lot of sand all around with them. When the wind stops blowing, this sand falls on the land and gets deposited. These deposits look like the little hills or mounds, which are called as the sand dunes.

Sand dunes are usually temporary structures as the next gust of wind can shift them to another place from the actual location where they formed.

Sand dunes are mostly associated with deserts, can be found in the region of deserts.

Therefore, the correct option is B.

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Thus, an object with a momentum of 0 (does or does not have
kinetic energy.
If an object has a momentum of 10 it (does or does not) have
kinetic energy.
How do you know?

Answers

Answer:

At momentum zero, kinetic energy = zero

At momentum 10, kinetic energy can never be equal to zero.

Explanation:

An object is said to have zero momentum when either its mass or its velocity is zero. Since, negetive mass doesn't exist, the velocity should be zero and this case, the object must be at rest. Momentum is zero when change in velocity is zero, but kinetic can never be zero when body is motion or has a momentum of 10.

A missle is fired horizontally with an initial velocity of 45 m/s from the top of a building 75 m high.
What is the horizontal range of the missle?
Select one:
a. 125 m
b. 176 m
c. 207 m
d. 689 m

Answers

The horizontal range of the missile is b) 176 m

Explanation:

The motion of the missile is a projectile motion, so it consists of two independent motions:  

- A uniform motion with constant velocity along the horizontal direction  

- A uniformly accelerated motion with constant acceleration (equal to the acceleration of gravity) in the vertical-downward direction  

To find the time of flight of the missile, we study the vertical motion. We can use the following suvat equation:

[tex]s=u_y t+\frac{1}{2}at^2[/tex]

where:

s = 75 m is the vertical displacement of the missile (the height of the building)

[tex]u_y=0[/tex] is the initial vertical velocity  (the missile is thrown horizontally)

t is the time of flight

[tex]a=g=9.8 m/s^2[/tex] is the acceleration of gravity

Solving for t, we find the time of flight:

[tex]t=\sqrt{\frac{2s}{g}}=\sqrt{\frac{2(75)}{9.8}}=3.91 s[/tex]

This means that the missile takes 3.91 s to reach the ground.

Now we study the horizontal motion: the missile moves with a constant horizontal velocity of

[tex]v_x = 45 m/s[/tex]

Therefore, the distance covered in a time t is

[tex]d=v_x t[/tex]

and by substituting t = 3.91 s, we find the horizontal range of the missile:

[tex]d=(45)(3.91)=176 m[/tex]

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why is electric switches and boards are made up of plastic​

Answers

Answer:

so that they don't calch fire

Find the statement about Fusion that is false. Group of answer choices

A) Fusion releases less energy than fission.

B) Fusion is extremely difficult to contain and maintain here on earth.

C) Fusion occurs when low mass nuclei, such as hydrogen collide and combine to form nuclei with greater masses.

D) fusion most commonly combines heavy isotopes of hydrogen into helium.

E) Fusion could be the world's answer to clean unlimited amounts of energy.

Answers

A) Fusion releases less energy than fission.

Explanation:

Nuclear fusion is a process in which nuclei of light elements combine together into heavier elements; in the process, the mass of the final nucleus is less than the total mass of the initial nuclei, therefore energy is released during the reaction.

Nuclear fusion is able to liberate a huge amount of energy, according to the famous Einstein's equation:

[tex]E=mc^2[/tex]

where

E is the energy released

m is the mass converted into energy in the process

c is the speed of light

Let's now analyze the statements given:

A) Fusion releases less energy than fission.  --> FALSE. In fact, fusion releases much more energy than fission.

B) Fusion is extremely difficult to contain and maintain here on earth.  --> TRUE. In order for fusion to occur, the initial nuclei must overcome the electrostatic repulsion between them in order to come very close to each other, within the range of action of the strong force; for this to happen, the temperature and the pressure must be enormous, and this makes fusion difficult to occur on Earth.

C) Fusion occurs when low mass nuclei, such as hydrogen collide and combine to form nuclei with greater masses.  --> TRUE

D) fusion most commonly combines heavy isotopes of hydrogen into helium.  --> TRUE, this is the most common reaction that occurs within the core of the stars

E) Fusion could be the world's answer to clean unlimited amounts of energy. --> TRUE: energy from fusion is a clean source of energy (there is no radioactive waste) and virtually unlimited, since it can be produced starting from hydrogen.

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Find the current passing through a circuit consisting of a battery and one resistor. The resistance has a retance of 2ohms and the battery hasa voltage of 12 volts

Answers

The current passing through a circuit consisting of a battery of 12 V and resistor of 2 ohms is 6 Ampere .

Explanation:

Assume the wires are ideal with zero resistance.  The current passing through the circuit will be  

           I = V/R = 12/2 = 6.000 A.

In a hydraulic system, why is the force exerted on a small piston multiplied when it acts on a larger piston?

Answers

The force multiplies because of Pascal's law .

Explanation:

Pascal's law states that " when there is an increase in pressure at any point in a confined fluid, there is an equal increase at every other point in the container". So, in a hydraulic system where it is a confined fluid system, where the dimensions of two sides are very different, due to it there is an increased amount of force.

if a swimmer is traveling at a constant speed of 0.85 m/s how long would it take to swim the length of 50 meter olymic sized pool

Answers

Answer:

58.82 Seconds

Explanation:

50m/0.85m/s=58.82s

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