Suppose a spacecraft orbits the moon in a very low, circular orbit, just a few hundred meters above the lunar surface.The moon has a diameter of 3500 km , and the free-fall acceleration at the surface is 1.60 m/s^2.How much time in minutes does it take for the spacecraft to complete one orbit?

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:

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:

4.0 m/s

Explanation:

The motion of the diver is the motion of a projectile: so we need to find the horizontal and the vertical component of the initial velocity.

Let's consider the horizontal motion first. This motion occurs with constant speed, so the distance covered in a time t is

[tex]d=v_x t[/tex]

where here we have

d = 3.0 m is the horizontal distance covered

vx is the horizontal velocity

t = 1.3 s is the duration of the fall

Solving for vx,

[tex]v_x = \frac{d}{t}=\frac{3.0 m}{1.3 s}=2.3 m/s[/tex]

Now let's consider the vertical motion: this is an accelerated motion with constant acceleration g=9.8 m/s^2 towards the ground. The vertical position at time t is given by

[tex]y(t) = h + v_y t - \frac{1}{2}gt^2[/tex]

where

h = 4.0 m is the initial height

vy is the initial vertical velocity

We know that at t = 1.3 s, the vertical position is zero: y = 0. Substituting these numbers, we can find vy

[tex]0=h+v_y t - \frac{1}{2}gt^2\\v_y = \frac{0.5gt^2-h}{t}=\frac{0.5(9.8 m/s^2)(1.3 s)^2-4.0 m}{1.3 s}=3.3 m/s[/tex]

So now we can find the magnitude of the initial velocity:

[tex]v=\sqrt{v_x^2+v_y^2}=\sqrt{(2.3 m/s)^2+(3.3 m/s)^2}=4.0 m/s[/tex]

Answer:

fusion

Explanation:

Answer:

2T

Explanation:

The period of a simple pendulum is:

T = 2π √(L/g)

If L is increased by a factor of 4, then:

2π √(4L/g)

4π √(L/g)

2T

So the period is doubled.

The new period will be 2T

[tex]\texttt{ }[/tex]

Simple Harmonic Motion is a motion where the magnitude of acceleration is directly proportional to the magnitude of the displacement but in the opposite direction.

[tex]\texttt{ }[/tex]

The pulled and then released spring is one of the examples of Simple Harmonic Motion. We can use the following formula to find the period of this spring.

[tex]\boxed{T = 2 \pi\sqrt{\frac{m}{k}}}[/tex]

T = Periode of Spring ( second )

m = Load Mass ( kg )

k = Spring Constant ( N / m )

[tex]\texttt{ }[/tex]

The pendulum which moves back and forth is also an example of Simple Harmonic Motion. We can use the following formula to find the period of this pendulum.

[tex]\boxed{T = 2 \pi\sqrt{\frac{L}{g}}}[/tex]

T = Periode of Pendulum ( second )

L = Length of Pendulum ( kg )

g = Gravitational Acceleration ( m/s² )

Let us now tackle the problem !

[tex]\texttt{ }[/tex]

Given:

initial period of a simple pendulum = T₁ = T

initial length of simple pendulum = L

final length of simple pendulum = 4L

Asked:

final period of a simple pendulum = T₂ = ?

Solution:

[tex]T_1 : T_2 = 2 \pi\sqrt{\frac{L_1}{g}} : 2 \pi\sqrt{\frac{L_2}{g}}[/tex]

[tex]T_1 : T_2 = \sqrt{\frac{L_1}{g}} : \sqrt{\frac{L_2}{g}}[/tex]

[tex]T_1 : T_2 = \sqrt{L_1} : \sqrt{L_2}[/tex]

[tex]T : T_2 = \sqrt{L} : \sqrt{4L}[/tex]

[tex]T : T_2 = 1 : 2[/tex]

[tex]\boxed{T_2 = 2T}[/tex]

[tex]\texttt{ }[/tex]

[tex]\texttt{ }[/tex]

Grade: High School

Subject: Physics

Chapter: Simple Harmonic Motion

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...

Sedimentary rocks are formed from sediments and deposits of particles of various types, forms and sizes that are transported by air, wind or water, and then subjected to chemical processes to become rocks.

These types of rocks are usually found in the form of layers or strata in places where sediment accumulates due to the erosion of other materials, for example on the banks of rivers, in valleys, lakes (and any other type of body of water).

An object cannot remain at rest unless the net force acting on it is zero.  It also can't move with constant, uniform motion (in a straight line at constant speed).

If the net force on it is anything other than zero, then the object must accelerate.  (Either its speed, or its direction, or both, must be changing.)  

An object can only remain at rest if the net force acting on it is zero, according to Newton's First Law of Motion. This means that any forces present are balanced, resulting in no net change. The law also applies to objects moving at a constant velocity, where they will maintain their state unless a net force is applied.

An object cannot remain at rest unless the net force acting on it is zero. According to Newton's First Law of Motion, a body at rest will remain at rest unless acted upon by a net external force. This implies that if there are multiple forces acting on an object, they must be balanced, resulting in a net force of zero. Similarly, when a car is parked, all forces on the car must be balanced out, and the car remains at rest with a zero net force.

It is important to note that an object can also be moving with a constant velocity with a net force of zero. For instance, a car moving down the street at a constant speed is experiencing a zero net force, as the frictional force between the road and tires is balancing out the drag force on the car. The car will continue to move at this constant velocity until an unbalanced force acts on it, causing it to accelerate or decelerate.

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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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Explanation:

    30km/h -->

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

  <-- 50km/h

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

Distance=2AB

Average Speed=37.5km/h

Answer:

free fall is any motion of a body where its weight is the only force acting upon it. In the context of general relativity, where gravitation is reduced to a space-time curvature, a body in free fall has no force acting on it and it moves along a geodesic.As the only force acting on the orbiter is the force of gravity from the Earth, it is in free fall. Note the definition does not specify that the free fall must be directly at the source of gravity, only that the force (weight) is the only force. Anna is right but not because the satellite keeps falling toward the Earth. It's because the gravity force is the only force acting on the satellite. I must add: gravity force is the only applied force, there is also centrifugal force. But that's a reaction force, not an applied force.

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: Radiation

Explanation:

There are three ways in which the thermal transfer occurs:

   1. By Conduction, when the transmission is by the direct contact.

  2. By Convection, heat transfer in fluids (like water or the air, for example).  

   3. By Radiation, by the electromagnetic waves (they can travel through any medium and in vacumm)

So, in the outter space is vacuum, this means the energy cannot be transmitted by convection, nor conduction. It must be transmitted by electromagnetic waves that are able to travel with or without a medium, and this is called radiation.

Answer:

Radiation

Explanation:

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:

30 %

Explanation:

The efficiency of a machine is defined as:

[tex]\epsilon = \frac{E_{useful}}{E_{input}}[/tex]

where

[tex]E_{useful}[/tex] is the useful output energy

[tex]E_{input}[/tex] is the energy in input

In this problem,

- The useful output energy is the increase in potential energy of the mass, so 300 J

- The energy in input to the machine is 1000 J

Therefore, the machine's efficiency is

[tex]\epsilon = \frac{300 J}{1000 J}=0.30[/tex]

In percentage,

0.30 x 100 = 30 %

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.

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:

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

Explanation:

Answer:

Explanation:

You can read this principle in any chemistry or physics textbook that deals with quantum numbers. It states that two electrons of an atom cannot have the same set of four quantum numbers.

As result:

Remember, that the quantum numbers are the numbers that identify the electrons in an atom.

In this way, Pauli's exclusion principle implies that two electrons occupying the same orbital will have equal n, ℓ, and mℓ values, meaning that their ms will be opposite: + 1/2 and −1/2.

The rule that no two electrons can possess the same four quantum numbers is known as the Pauli Exclusion Principle. Proposed by Wolfgang Pauli, this rule dictates that no two electrons can be in the same state within an atom. It limits the number of electrons in atomic shells and subshells, influencing the structure of atoms.

The rule that no two electrons can have the same four quantum numbers is known as the Pauli Exclusion Principle. These quantum numbers include: principal quantum number (n), orbital angular quantum number (l), magnetic quantum number (m), and spin quantum number (ms).

An Austrian physicist, Wolfgang Pauli, proposed this rule in 1925. This principle means that two electrons can share the same orbital if only their spin quantum numbers have different values. Since the spin quantum number can only take two values: +½ or -½, a maximum of only two electrons can occupy the same orbital. As a result, any atomic orbital can be populated by zero, one, or two electrons only.

This principle is important because it limits the number of electrons in atomic shells and subshells, and thus plays a crucial role in determining the structure of atoms and the characteristics of the elements on the periodic table.

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(a) 0 W

In this situation, the car is moving on a level road at constant velocity. This means that its acceleration is zero:

a = 0

But this also means that the net force acting on the car is zero, according to Newton's second law:

F = ma = 0

The power required to move the car is

P = Fv

where F is the force applied to the car and v the velocity. Since there are no air drag/frictional forces, the force applied to the car is exactly zero: so, the extra power needed to keep the car in motion at constant velocity is also zero.

(b) 81815 W

In this situation, the car is moving on an uphill road, so there is a component of the weight parallel to the incline acting agains the direction of motion of the car. This component of the weight is given by

[tex]W=mg sin \theta[/tex]

where

m = 1200 kg is the mass of the car

g = 9.81 m/s^2 is the acceleration of gravity

[tex]\theta = 30^{\circ} [/tex] is the angle of the incline

Substituting,

[tex]W=(1200 kg)(9.81 m/s^2)(sin 30^{\circ} )=5886 N[/tex]

So the truck must exerts an additional force of F = 5886 N to keep the car in motion at constant velocity.

The velocity of the car is

v = 50 km/h = 13.9 m/s

So the extra power needed is

P = Fv = (5886 N)(13.9 m/s) = 81,815 W

(c) 31250 W

Here the car accelerates to a final velocity of

v = 90 km/h = 25 m/s

from an initial velocity of

u = 0

So the work done on the car is equal to its change in kinetic energy, so:

[tex]W=K_f - K_i = \frac{1}{2}mv^2 - \frac{1}{2}mu^2 = \frac{1}{2}(1200 kg)(25 m/s)^2 -0 =3.75\cdot 10^5 J[/tex]

The extra power erogated by the truck therefore must be

[tex]P=\frac{W}{t}[/tex]

where

t = 12 s

is the time taken

Substituting,

[tex]P=\frac{3.75\cdot 10^5 J}{12 s}=31250 W[/tex]

Answer:

It remains zero

Explanation:

The work done on an object is given by:

[tex]W=Fd cos \theta[/tex]

where

F is the magnitude of the force applied

d is the displacement of the object

[tex]\theta[/tex] is the angle between the direction of the force and of the displacement

In this problem, the object is the wall, which is stationary. Therefore, the displacement of the wall is zero:

d = 0

And so, the work done is always zero, even if the force applied is twice as stronger.

Answer:

4.2amps

Explanation:

Answer:

The current is 4.2 amp.

(c) is correct option.

Explanation:

Given that,

Power = 500 watt

Voltage = 120 Volt

Time = 30 sec

We need to calculate the current

Using formula of current

[tex]P =I\times V[/tex]

[tex]I = \dfrac{P}{V}[/tex]

Where, I = current

P = power

V = voltage

Put the value into the formula

[tex]I=\dfrac{500}{120}[/tex]

[tex]I=4.2\ amp[/tex]

Hence, The current is 4.2 amp.

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

Answer:

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Explanation:

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Answer:

Explanation:

crust

Answer:c hubble's law

Explanation:

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.

Explanation:

Nanotechnology is the technology that is responsible for the manipulation of matter on a nanometric scale ([tex]1nm=1(10)^{-9}m[/tex]). In addition, it works with the design at the atomic or molecular level.

This technology is based on nanoscience that is responsible for modifying or adulterating matter as it exists, but unlike common sciences, it does so at a molecular level, that is, on a very small scale. Thanks to this, it is possible to manufacture materials and machines from the rearrangement of atoms and molecules with various purposes, mainly industrial and medical.

Therefore:

Nanotechnology is unique, because it is small enough to show quantum mechanical features but still large enough to be controlled and manipulated.

Answer:

Answer is Small

Explanation:

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.

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:

We can predict that baby jerome's parents are serious people as well as the other people around him.  

Explanation:

The reason behind this is because if a baby isn't laughing or having fun it means that the atmosphere around him or is a serious one

Final answer:

Baby Melanie's engaging behaviors, such as smiling and laughing, are likely to elicit more sensitive and affectionate care from caregivers, which can positively affect her cognitive development. Baby Jerome's lack of such behaviors may lead to less nurturing interaction, which could have implications for his development.

Explanation:

Baby Melanie, who frequently smiles, giggles, and laughs with her parents and other caregivers, demonstrates behaviors that are often positively reinforced by her caregivers, making them more likely to provide sensitive and affectionate care. Conversely, if Baby Jerome does not display these engaging behaviors, he may receive less of this type of interaction.

This variability in caregiver responsiveness could influence the cognitive development of the infants, as studies suggest that infants who are perceived as easygoing and attractive often receive more nurturing care, which is beneficial for their cognitive and social development.

In the 'Strange Situation' experiment, where a mother puts the baby down and leaves the room, the baby's reaction to the stranger and the reunion with the mother can also provide insights into their attachment style, which is influenced by the parental care they receive. These early interactions and the quality of care can predict later emotional and relational outcomes for the child.