The force required to maintain an object at a constant velocity in free space is equal to

Answer:  The correct answer is :  D. The universe will continue expanding forever    

Explanation:  The theory that has had more acceptance is that the universe will continue to expand indefinitely ending in a "big freeze", also called thermal death of the universe. This theory holds that in about a billion years the stars will go out and most of the universe will remain in darkness. The universe would be too cold to have life.

Answer: 0.313 rad/s

Explanation:

The equation that relates the velocity [tex]V[/tex] and the angular velocity [tex]\omega[/tex] in the uniform circular motion is:

[tex]V=\omega.r[/tex]   (1)

Where [tex]r=d/2=100m[/tex] is the radius of the space station (with a diaeter of 200m) that describes the uniform circular motion.

Isolating [tex]\omega[/tex] from (1):

[tex]\omega=\frac{V}{r}[/tex]  (2)

On the other hand, we are told the “artificial gravity” produced by the cetripetal acceleration [tex]a_{c}[/tex] is [tex]9.8m/s^{2}[/tex], and is given by the following equation:

[tex]a_{c}=\frac{V^{2}}{r}[/tex]   (3)

Isolating [tex]V[/tex]:

[tex]V=\sqrt{a_{c}.r}[/tex]   (4)

[tex]V=31.3049m/s[/tex]   (5)

Substitutinng (5) in (2):

[tex]\omega=\frac{31.3049m/s}{100m}[/tex]  (6)

[tex]\omega=0.313rad/s[/tex] This is the angular velocity that would produce an “artificial gravity” of 9 [tex]9.8m/s^{2}[/tex].

The angular velocity that would produce an artificial gravity of 9.80 m/s^2 at the rim of the space station is 0.221 m/s.

To calculate the angular velocity required to produce an artificial gravity of 9.80 m/s2, we can use the equation ac = rω2. Here, ac is the centripetal acceleration, r is the radius of the space station, and ω is the angular velocity. Rearranging the equation, we get ω = sqrt(ac/r), where sqrt is the square root function. Plugging in the given values, we have ω = sqrt(9.80 m/s2 / 200 m) = 0.221 m/s. Therefore, the angular velocity that would produce an artificial gravity of 9.80 m/s2 at the rim of the space station is 0.221 m/s.

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The motion of a pendulum is predominantly affected by gravity, creating a restoring force, and the tension in the string, which guides the pendulum's arc-like oscillation. The period of a pendulum is dependent on its length and the acceleration due to gravity, not the mass of the bob.

In addition to gravity, the other predominant force affecting the motion of a pendulum is the restoring force arising from the tension in the string. This force is crucial for the oscillation of the pendulum. When a pendulum swings, gravity acts to pull it back towards the equilibrium position, creating a restoring force that is a component of the gravitational force. As the pendulum moves, the tension in the string exerts a force perpendicular to the direction of gravity, which along with the component of gravity, causes the pendulum to follow an arc-like path.

The motion of a pendulum is not affected by the mass of the bob; instead, it is the length of the pendulum and the acceleration due to gravity that determines its period. For a simple pendulum, the period formula shows that the period (T) is independent of the mass and is given by T = 2π√(L/g), where L is the length and g is the acceleration due to gravity.

Thus, the primary forces that cause a pendulum to oscillate are gravity, providing the restoring force, and the tension in the string, allowing for the pendulum's arc path during its swing.

Answer:

fusion

Explanation:

Explanation:

Mass is defined as the amount of matter that makes up a body; which is measured by its inertia.  

It should be noted that inertia is a property of bodies or objects that is related to resistance to changes in its state of motion. So, the amount of inertia that a body possesses depends on its quantity of matter, that is, its mass.

The amount of inertia an object has is determined by its mass. An object with a larger mass will have greater inertia.

The amount of inertia an object has is determined by its mass. Inertia is the property of an object that resists changes in its motion. The more mass an object has, the greater its inertia. This means that an object with a larger mass will require more force to accelerate or decelerate compared to an object with a smaller mass.

For example, a heavy book will be harder to push than a lightweight book because it has more inertia due to its greater mass.

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Lights from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving away from the earth.  (A)

A. Lights from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving away from the earth.

Redshift in doppler effect  is an example of the Doppler Effect. As an object moves away from us, the sound or light waves emitted by the object are stretched out, which makes them have a lower pitch and moves them towards the red end of the electromagnetic spectrum, where light has a longer wavelength.

The doppler red - shift of light observed from distant starts and galaxies gives evidence that the universe is expanding so , since it is a red light shift that means Lights from other galaxies shifts toward the red end of the spectrum and as the universe is expanding which shows that the galaxies are moving away from the earth.

hence correct option is A. Lights from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving away from the earth.

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Answer: An iron atom emits particles when it is struck by light (by the photoelectric effect)

Explanation:

The first atomic model was the one proposed by Jhon Dalton, according to which it is postulated that:

"Matter is made up of indivisible, indestructible and extremely small particles called atoms."

That is, the atom is a solid and indivisible mass.

However, the fenomenom by which an iron atom emits particles when it is struck by light (known as the photoelectric effect) can not be explaind by this indivisible atom model.

To understand it better:

The photoelectric effect consists of the emission of electrons (electric current) that occurs when light falls on a metal surface under certain conditions.

This is possible by considering light as a stream of photons, where each of them has energy. This energy is be able to pull an electron out of the crystalline lattice of the metal and communicate, in addition, a kinetic energy.  This means the atom is not indivisible, but it is a composition of different particles.

In fact, currently it is known that each atom is composed of a nucleus and one or more electrons attached to the nucleus, which is composed of one or more protons and typically a similar number of neutrons.

Explanation:

    30km/h -->

A-----------------B

  <-- 50km/h

Displacement = 0 (initial and final point are the same)

Distance=2AB

Average Speed=37.5km/h

Answer:

30.0 cm

Explanation:

We can use the mirror equation:

[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{q}[/tex]

where

f = +15.0 cm is the focal length of the mirror

p = 30.0 cm is the distance of the object from the mirror

q is the distance of the image from the mirror

Solving the equation for q, we find

[tex]\frac{1}{q}=\frac{1}{f}-\frac{1}{p}=\frac{1}{15.0 cm}-\frac{1}{30.0 cm}=\frac{1}{30.0 cm}\\q = 30.0 cm[/tex]

Answer:

D. It has a low resistance and allows charges to move freely.

Explanation:

The high conductivity of copper allow charges to move freely without the need of too much force. The conductivity decreases with increase in resistance. Low resistance also means less heating of the conductors. This property of copper makes it ideal for use in the manufacture of electric cables and conductors for various gadgets.

The correct description of copper is that it has a low resistance and allows charges to move freely, making it a good conductor of electricity.

The statement that best describes copper is D. It has a low resistance and allows charges to move freely. Copper is a good conductor of electricity due to the presence of conduction electrons, which are the outermost electrons that are only loosely bound to the nucleus.

This arrangement allows these electrons to move easily from one atom to another within the material, facilitating the flow of electric charge. Copper's relative low electrical resistance makes it ideal for use in electric wiring, contributing to minimal energy dissipation in electrical systems.

Answer:

c) the displacement is zero and pressure is at a maximum

Explanation:

Answer:

The work done is doubled

Explanation:

The work done on an object by a force is (assuming the force is parallel to the displacement of the object)

W = Fd

where

W is the work done

F is the magnitude of the force

d is the displacement of the object

In this problem:

- the force applied is the same

- the displacement of the object is doubled, d' = 2d

So the new work done will be

W' = Fd' = F(2d) = 2 (Fd) = 2 W

So, the work done is doubled.

Final answer:

Pushing an object twice as far with the same force results in doubling the work done due to the work being the product of force and distance. A greater change in momentum is also achieved since momentum change is proportional to the force application time.

Explanation:

When you push an object twice as far while applying the same force, you do double the work. This is because work is the product of force and the distance over which the force is applied. If we consider the equation for work, W = F × d, where W is work, F is force, and d is distance, by doubling the distance d while keeping the force F constant, the work done W is doubled. It is also essential to consider that if you are pushing an object on a surface with friction, you might have to apply more effort to overcome the frictional force.

According to Newton's second law, the acceleration of an object is proportional to the net force acting upon it and inversely proportional to its mass. From this, it follows that if you're pushing an object and increase the distance while maintaining the same force, the object's velocity will increase over a longer time, leading to a greater change in momentum, which is in line with the concept that the change in momentum is proportional to the time the force is applied.

Furthermore, the work-energy principle tells us that the work done on an object is equal to the change in its kinetic energy. Therefore, pushing an object twice as far with the same force means you've input twice the energy into the object, assuming no other external forces like friction or air resistance are doing work on the object.

Answer:

Making observations is the step of scientific method in which information is obtained through the senses.

Explanation:

Making observations is the step of scientific method in which information is obtained through the senses. This also happens to be the first step of the scientific method. Other steps include;

analyzing data

drawing conclusions

revising a hypothesis

Answer:

The correct answer will be-making observations (first step).

Explanation:

The senses are the physiological response of the external surrounding that allows us to live like sight, taste, smell, touch and hearing.

The scientific method begins with making observations of the natural world followed by framing a hypothesis which could be proved or disproved by performing experiments.

The senses allow us to sense the natural phenomenon through sensory organs which is included in the process of making observations.  

Thus, making observations is the correct answer.

Answer:

The answer is A but I could be wrong

Answer: A. Predict the effect of bike size on the speed of a rider his height.

(Apex) Pretest

Answer:

C. Distance and Time

Explanation:

Speed is defined as the distance covered per unit of time. It is a scalar quantity and as such expressed in scalar terms. When we talk about speed, the direction of motion does not matter. We only try to find the rate at which a body moves with time.

It is expressed as:

                        Speed = [tex]\frac{Distance covered}{Time taken}[/tex]

The SI unit of speed is m/s or ms⁻¹

Average speed is calculated using the measurements of distance and time, making option C the correct answer. Speed is a scalar quantity and should not be confused with velocity, which includes direction.

The two measurements necessary for calculating average speed are distance and time. Thus, the correct answer to the question is C. Distance and Time. Average speed is defined as the total distance traveled divided by the elapsed time. When we express this mathematically, average speed is calculated using the formula:

Average speed = Total distance traveled / Elapsed time

It is important to note that speed is a scalar quantity, meaning it does not have a direction associated with it, while velocity is a vector quantity, which includes both magnitude and direction.

Answer:

https://brainly.com/question/11872573

Explanation:

all the credit goes to the user who answered this.

I do not have any rights on this.

Tip=>Please check your question in the search bar before asking.

Answer:

Explanation:

crust

Sodium bicarbonate is a common base. Please find more information on the base below.

A base in chemistry is a class of substance characterized by being generally water-soluble, have a bitter taste, turns red litmus blue, and react with acids to form salts.

Sodium bicarbonate, also known as baking soda, is a salt of sodium hydroxide and carbonic acid. It has the chemical formula; NaHCO₃.

When sodium bicarbonate dissolves in an aqueous solution, it forms bicarbonate, which turns the solution basic, hence, it is said to act as a weak base in aqueous solution.

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Answer:

B)None

Explanation:

Answer: alpha radiation

Explanation:

Answer:

Answer:

1. emits energy when it decays

2. 0

3. helium nucleus

The least penetrating form of radiation: 4. alpha radiation

5. increases by 1

Explanation:

A. 13 Hz.

The way to solve this problem is using the equation f = v/λ, where f is the frecuency of the wave, v the velocity of the wave and λ is the wavelength.

A wave travels at a speed of 5.2 m/s and the distane between crests is λ = 0.40 m. To find the frecuency of the way:

f = v/λ = 5.2 m/s / 0.40 m

f = 13 s⁻¹

f = 13 Hz

Explanation:

the lights on Galaxy watch shifted of uniform amounts to what the rate in of the spectrum,regardless of the distance from Earth

Hello There!

This statement is true.

The winter solstice is in the Northern Hemisphere

Explanation:

Sensory adaptation refers to the adjustment of the sensory capacity of a person following prolonged exposure to stimuli.

To better understand this, it is necessary to explain that environmental stimuli cause a change in the sensitivity of a person's sensory receptors. Then, depending on the type of environmental stimulus, the determined receptor will be stimulated (related to the five main senses of the human being: sight, smell, taste, touch and hearing).

However, when a person gets used to a stimulus, adaptation occurs. Therefore, it will not respond to the stimulus in the same way as it did before.

A very common example is the relation with the smells (olfactory sense), because people get used quickly to the smells that surround them and then they stop "perceiving" the smell.

Decreased sensitivity to an unchanging stimulus is known as sensory adaptation. This process allows organisms to ignore 'background noise' in their environment and focus on more important stimuli.

The term for decreased sensitivity to an unchanging stimulus is known as sensory adaptation. This phenomenon occurs when sensory neurons become less sensitive to constant stimuli that are unchanging over an extended period of time. It's the reason you might stop noticing a persistent smell after being in a room for a while; your sensory neurons are effectively 'deciding' that this unchanging stimulus is not important. This is a key process that allows organisms to filter out 'background noise' in their environment and focus on changes and potential threats. An example of sensory adaptation could be your tactile sense 'ignoring' the clothes you are wearing, you become adapted and no longer consciously feel them.

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Answer:

The number of protons within the nucleus of a given atom is equal to the atomic number of the corresponding element, which can be found on the periodic table. For example, the atomic number of helium is two. Therefore, the number of protons is also two

Explanation:

Step 1 - Gather Information

The first thing you will need to do is find some information about your element. Go to the Periodic Table of Elements and click on your element. If it makes things easier, you can select your element from an alphabetical listing.

Use the Table of Elements to find your element's atomic number and atomic weight. The atomic number is the number located in the upper left corner and the atomic weight is the number located on the bottom, as in this example for krypton:

Krypton's data from the Table of Elements

Step 2 - The Number of Protons is...

The atomic number is the number of protons in an atom of an element. In our example, krypton's atomic number is 36. This tells us that an atom of krypton has 36 protons in its nucleus.

The interesting thing here is that every atom of krypton contains 36 protons. If an atom doesn't have 36 protons, it can't be an atom of krypton. Adding or removing protons from the nucleus of an atom creates a different element. For example, removing one proton from an atom of krypton creates an atom of bromine.

Step 3 - The Number of Electrons is...

By definition, atoms have no overall electrical charge. That means that there must be a balance between the positively charged protons and the negatively charged electrons. Atoms must have equal numbers of protons and electrons. In our example, an atom of krypton must contain 36 electrons since it contains 36 protons.

Electrons are arranged around atoms in a special way. If you need to know how the electrons are arranged around an atom, take a look at the 'How do I read an electron configuration table?' page.

An atom can gain or lose electrons, becoming what is known as an ion. An ion is nothing more than an electrically charged atom. Adding or removing electrons from an atom does not change which element it is, just its net charge.

For example, removing an electron from an atom of krypton forms a krypton ion, which is usually written as Kr+. The plus sign means that this is a positively charged ion. It is positively charged because a negatively charged electron was removed from the atom. The 35 remaining electrons were outnumbered by the 36 positively charged protons, resulting in a charge of +1.

Step 4 - The Number of Neutrons is...

The atomic weight is basically a measurement of the total number of particles in an atom's nucleus. In reality, it isn't that clean cut. The atomic weight is actually a weighted average of all of the naturally occurring isotopes of an element relative to the mass of carbon-12. Didn't understand that? Doesn't matter. All you really need to find is something called the mass number. Unfortunately, the mass number isn't listed on the Table of Elements. Happily, to find the mass number, all you need to do is round the atomic weight to the nearest whole number. In our example, krypton's mass number is 84 since its atomic weight, 83.80, rounds up to 84.

The mass number is a count of the number of particles in an atom's nucleus. Remember that the nucleus is made up of protons and neutrons. So, if we want, we can write:

Mass Number = (Number of Protons) + (Number of Neutrons)

For krypton, this equation becomes:

84 = (Number of Protons) + (Number of Neutrons)

If we only knew how many protons krypton has, we could figure out how many neutrons it has. Wait a minute... We do know how many protons krypton has! We did that back in Step 2! The atomic number (36) is the number of protons in krypton. Putting this into the equation, we get:

84 = 36 + (Number of Neutrons)

What number added to 36 makes 84? Hopefully, you said 48. That is the number of neutrons in an atom of krypton.

The interesting thing here is that adding or removing neutrons from an atom does not create a different element. Rather, it creates a heavier or lighter version of that element. These different versions are called isotopes and most elements are actually a mixture of different isotopes.

If you could grab atoms of krypton and count the number of neutrons each one had, you would find that most would have 48, others would have 47, some would have 50, some others would have 46, a few would have 44 and a very few would have 42. You would count different numbers of neutrons because krypton is a mixture of six isotopes.

In Summary...

When the heat source is removed from a fluid, convection currents in the fluid will eventually distribute heat uniformly throughout the fluid.  When all of the fluid is at the same temperature, convection currents will stop.

Answer:

562.5 m

Explanation:

The vertical position of the ball is given by

[tex]y=h+ut+\frac{1}{2}gt^2[/tex]

where

h is the height of the tower (the initial position of the ball)

u = 100 m/s is the initial velocity of the ball (positive because it points upwards)

g = -9.8 m/s^2 is the acceleration due to gravity (negative because it points downward)

t is the time

Substituting t =25 s and y = 0 (at t=25 s, the height of the ball is zero, since it has reached the base of the tower), we can re-arrange the equation to find h:

[tex]h=y-ut-\frac{1}{2}gt^2 = 0-(100 m/s)(25 s) - \frac{1}{2}(-9.8 m/s^2)(25 s)^2 = 562.5 m[/tex]

Answer:

The attitude of a text about a subject being discussed is called tone.

Answer:

tone

Explanation:

In a story the attitude of a character towards something shows us the character's tone. Tone is basically the emotion associated with a subject. Word choice or the arrangement of words allow a writer to express tone.

Mood and tone should not be confused the mood is the overall feeling the reader experiences while reading.

Answer:

1.17 x 10^2 L

Explanation:

We can find the volume of the gas by using the ideal gas law:

[tex]pV=nRT[/tex]

where we have:

[tex]p=792 Torr \cdot \frac{1 atm}{760 Torr} = 1.04 atm[/tex] is the pressure

V is the volume

n = 4.8 mol is the number of moles

R = 0.0821 L · atm/mol · K is the ideal gas constant

[tex]T=37^{\circ}+273 =310 K[/tex] is the temperature

Solving the equation for V, we find the volume

[tex]V=\frac{nRT}{p}=\frac{(4.8 mol)(0.0821 L atm/mol K)(310 K)}{1.04 atm}=117.5 L = 1.17\cdot 10^2 L[/tex]

Answer:78 N

Explanation:Impulse=Force*time

=39*2 =78 Ns

Answer:

78 N S

Explanation:

just got it right on edg 2021

Answer:

Religion

Explanation:

Religion is a big factor. Many people believe that the Big Bang DID happen while some believe it to be incorrect due to religious beliefs. I can guarantee if you ask people on the street about the Big Bang, someone will say something about religion. The Theory goes against every religions beliefs as to how the universe was created.

Final answer:

The Big Bang theory, supported by evidence like the CMB and Hubble expansion, may be controversial among nonscientists due to misunderstandings and challenges to personal beliefs. It describes the universe's expansion from a hot, dense state, not an explosion in space. Clarification of common misconceptions is essential for better public understanding.

Explanation:

The Big Bang theory is a cornerstone of modern astrophysics and cosmology, and it describes the universe's birth approximately 13.7 billion years ago from an extremely hot, dense state. Following this, the universe has been expanding and cooling ever since. One crucial piece of evidence for the Big Bang theory is the cosmic microwave background (CMB), which is seen as the remnant heat from the early universe. Moreover, the observed Hubble expansion, where galaxies are moving away from us, supports the idea of an expanding universe.

Many nonscientists may find the Big Bang theory controversial due to a variety of reasons. These objections might stem from misunderstandings about the nature of the theory, as it is not an explosion in the common sense but rather an expansion of space-time itself. Additionally, the Big Bang theory can challenge certain philosophical or religious beliefs about the origin of the universe. This discord may be due to the theory's implications that are difficult to reconcile with personal beliefs or due to a lack of familiarity with the scientific evidence and reasoning that supports the theory.

It is important to note that the Big Bang theory is not an 'explosion' from a single point in space, but instead a rapid expansion of space itself in all directions. Misconceptions like this often contribute to the controversy surrounding the theory among nonscientists. To address such misconceptions and provide a clearer understanding, resources like the scientific article by Lineweaver and Davis titled "Misconceptions about the Big Bang" explain the fundamental concepts using the framework of general relativity.