a body covers a semicircle of radius 7cm in 5s .find its linear speed

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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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:

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:78 N

Explanation:Impulse=Force*time

=39*2 =78 Ns

Answer:

78 N S

Explanation:

just got it right on edg 2021

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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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:

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:

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:  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:

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:

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:

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Explanation:

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Answer:

Explanation:

crust

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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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

Hello There!

This statement is true.

The winter solstice is in the Northern Hemisphere

Explanation:

Radiant energy is transmitted through the electromagnetic waves, that is, the light in all its spectrum. This energy is characterized by its propagation in vacuum, without needing a medium or material.

This energy can also be transformed into thermal energy by transmitting heat by radiation.

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:

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.

Explanation:

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

Answer: It states, rather than explains, the relationship between the variables.

Explanation:

Let's start by defining  theory and law:

Theory is the set of rules and principles that describe and explain a particular phenomenon.

In other words: It refers to the explanation of the functioning of things.

Another important point is that the theory is subject to changes as new evidence emerges that gives meaning to it.

On the other hand, a Law is an affirmation (something established) based on repeated long-term observation of a phenomenon that has been studied and verified.

That is: A law is present in all known theories and therefore is considered universal. In addition, a law can not be refuted, nor changed,  because its precepts have been proven through various studies.

Then, based on what is explained above, the statement "force equals mass times acceleration" is a law because it is a statement that exists because it was rigorously tested and verified, therefore it can not be refuted.

Answer:

fusion

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:

the answer is  covalent bond

Explanation:

Atoms in a crystal are held together by a net attractive force between their constituent electrons and atomic nuclei. This force depends on the type of bonding in the crystal: ionic, covalent, or metallic. Molecules can also form crystals through molecular bonding.

Atoms arrange themselves in a lattice to form a crystal because of a net attractive force between their constituent electrons and atomic nuclei. The crystals formed by the bonding of atoms belong to one of three categories, classified by their bonding: ionic, covalent, and metallic. Molecules can also bond together to form crystals; these bonds, not discussed here, are classified as molecular.

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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.

(a) 2.97 m

The wavelength of an electromagnetic wave is given by:

[tex]\lambda = \frac{c}{f}[/tex]

where

[tex]\lambda[/tex] is the wavelength

c is the speed of light

f is the frequency

For the radio wave in the problem, the frequency is

[tex] f = 101 MHz = 101 \cdot 10^6 Hz[/tex]

Therefore, the wavelength is

[tex]\lambda = \frac{3\cdot 10^8 m/s}{101\cdot 10^6 Hz}=2.97 m[/tex]

(b) [tex]1.05\cdot 10^{-4} W/m^2[/tex]

The intensity of the radio signal is given by

[tex]I=\frac{P}{A}[/tex]

where

P is the power of the signal

A is the area over which the signal is radiated

In this situation:

P = 50,000 W is the power

the area is a hemisphere with a radius of

r = 8.70 km = 8700 m

So the area to be considered is

[tex]A=2\pi r^2 = 2\pi (8700 m)^2=4.76\cdot 10^8 m^2[/tex]

Therefore, the intensity of the signal is

[tex]I=\frac{50000 W}{4.76\cdot 10^8 m^2}=1.05\cdot 10^{-4} W/m^2[/tex]

(c) 0.281 V/m

The intensity of an electromagnetic wave can be written as

[tex]I=\frac{1}{2}c\epsilon_0 E^2[/tex]

where

c is the speed of light

[tex]\epsilon_0[/tex] is the vacuum permittivity

E is the amplitude of the electric field

Re-arranging the equation, we get

[tex] E=\sqrt{\frac{2I}{c \epsilon_0}}[/tex]

And substituting

[tex]I=1.05\cdot 10^{-4} W/m^2[/tex]

we find

[tex] E=\sqrt{\frac{2(1.05\cdot 10^{-4} W/m^2)}{(3\cdot 10^8 m/s)(8.85\cdot 10^{-12} F/m)}}=0.281 V/m[/tex]

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:

B)None

Explanation:

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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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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