Why do we always only see one side of the moon?

A. From Time to time we see all the sides of the moon from the Earth.

B. The far (opposite) side only faces the Earth during the daytime when the Sun’s light outshines the Moon.

C. The moon is tidally locked with the Earth.

D. The moon does not rotate.

An electric motor converts electrical energy into physical movement. Electric motors generate magnetic fields with electric current through a coil. The magnetic field then causes a force with a magnet that causes movement or spinning that runs the motor. Electric motors are used in all sorts of applications.

The impulse of the material point is equal to the product of mass and its velocity.

      The unit of measurement of the imouls is:

                                         [P] = [m] * [v] = kg * m / s.

Answer:

kg·m/s

Explanation:

The momentum of a body is calculated according to the following formula.

momentum = mass * velocity

Since the SI unit unit for mass is kilogram and the SI unit for velocity is metres/second then the multiplication of both will, algebraically give kg·m/s

By setting the formula for centripetal acceleration equal to the acceleration due to gravity and using the known radius of the Earth, we find the speed at the equator. Using this speed to divide the Earth's equator's circumference, we estimate the length of a day to be approximately 1.41 hours or 84 minutes.

To estimate the length of the day if the centripetal acceleration at the equator due to the spinning Earth was equal to the acceleration of free fall (g=9.8 ms⁻²), we need to utilize known physical constants and the formula for centripetal acceleration.

The formula for centripetal acceleration is a_c = v²/r, where v is the speed, and r is the radius of the circular path. We set this equal to g (9.8 m/s²), so v²/r = 9.8 m/s2. Given the known radius of Earth R = 6.376 x 10^6 m, we can solve for the speed at the equator v.

From the speed, we can calculate the time it would take for the Earth to complete a single rotation. Since the distance the Earth covers in a day is a circular path around the Earth’s equator, this distance is equal to the Earth's circumference, which is 2πR. Dividing this by the speed gives the length of a day, which we can calculate to be 1.41 hours or approximately 84 minutes.

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I'm not sure what you mean by "think of speed", but the way we measure it is by plugging the numbers into this formula: distance divided by time. If you are trying to find an average speed, then your formula would be: total distance divided by total time. I hope this helped!:)

a)

consider the motion in upward direction as positive and down direction as negative

Y₀ = initial position of the stone = 20 m

v₀ = initial velocity of the stone = 10 m/s

a = acceleration = - 9.8 m/s²

Y = final position of the stone when it reach the maximum height

v = final velocity at the maximum height = 0 m/s

t = time taken to reach the maximum height

Using the equation

v² = v₀² + 2 a (Y - Y₀)

0² = 10² + 2 (- 9.8) (Y - 20)

Y = 25.1 m

also using the equation

v = v₀ + a t

inserting the values

0 = 10 + (- 9.8) t

t = 1.02 sec

b)

consider the motion in upward direction as positive and down direction as negative

Y₀ = initial position of the stone = 20 m

v₀ = initial velocity of the stone = 10 m/s

a = acceleration = - 9.8 m/s²

Y = final position of the stone when it reach the ground = 0 m

t = time taken to reach the ground

Using the equation

Y = Y₀ + v₀ t + (0.5) a t²

0 = 20 + 10 t + (0.5) (- 9.8) t²

t = 3.3 sec

Final answer:

The DNA in the G1 phase is unreplicated chromosomal DNA, as this phase involves the cell growing and accumulating the necessary components and energy for upcoming DNA replication in the S phase.

Explanation:

Understanding the G1 Phase of Interphase

The G1 phase is the initial stage of the cell cycle and falls under interphase. It is often referred to as the "first gap" mainly because there are no significant changes visible under a microscope during this period. Despite this, the cell is not dormant; it is engaged in vital preparatory activities. During the G1 stage, the cell grows and increases in size, meticulously assembling the basic biochemical compounds needed for DNA replication.

This includes the building blocks of chromosomal DNA and the associated proteins. In addition to this, the cell is also building up sufficient energy reserves necessary to go through the upcoming phase of DNA synthesis or the S phase, where each chromosome is replicated.

Given that:

time (t) = 20 s ,

        S = ?

We know that S = ut + 1/2 at²     meters

                       since free fall, a = g = 9.81 m/s² ; u =0 ;

                        S = 0 + 1/2 × 9.81 × 20²

                        S= 1962 m

Given that:

                       mass of the ball (m) = 0.5 Kg ,

                    ball strikes the wall (v₁) = 5 m/s ,

rebounds in opposite direction (v₂) = 2 m/s,

                                time duration (t) = 0.01 s,

        Determine the force (F) = ?

We know that from Newton's II law,

                                F = m. a  Newtons  

                                  (velocity acting in opposite direction, so a = ( (v₁ + v₂)/t

                                   = m × (v₁ + v₂)/t

                                   = 0.5 × (5 + 2)/0.01

                                  = 350 N

The force acting up on the ball is 350 N

Answer:

1) Oxygen 2) So The Troposphere is a good place for planes to fly. 3)  [tex]CO_{2}[/tex] 4) It measures how tightly molecules are packed, It pushes molecules in one direction

Explanation:

1) Which gas in Earth’s atmosphere forms ozone?

Oxygen since Ozone is formed when [tex]O_{2} [/tex] receives Ultraviolet in its energetic form[tex] O_{3}[/tex], in a process called photolise.

2) Which characteristics describe the troposphere? Check all that apply.

This layer is the closest to the Earth although it is thicker in the Equator. Most planes fly in there.

So The Troposphere is a good place for planes to fly.

3) Which gas in Earth’s atmosphere has increased over time due to burning fossil fuels?

The outcome burning of fossil fuels is among other gases is the [tex]CO_{2}[/tex]

4) Which phrases describe air density?

Although these are not precise descriptions:

It measures how tightly molecules are packed The more density the more molecules are packed in given volume.

It pushes molecules in one direction, In a column of air the more the altitude the more molecules are pushed into the lower altitude region.

A primary succession does not include any invasive species. This is true statement.

When a new piece of land is produced or is first exposed, primary succession occurs. This may occur, for instance, when lava solidifies and forms new rocks or when a glacier recedes and reveals bare rocks. In the initial succession, organisms have to start over. First, lichens may cling to rocks, followed by a few small plants capable of surviving without much soil. The term "pioneer species" refers to these.

More and larger plants start to colonize the region as a result of the decomposition of those plants, which gradually helps to create soil. Once sufficient soil has accumulated and sufficient nutrients are accessible, a climax community, such as a forest, is created. In the event that the site is disturbed after this, secondary succession takes place.

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Answer:

 Period = 1.67 seconds

 Frequency = 0.6 Hz

Explanation:

  Number of vibrations in 60 seconds = 36

  Frequency is defined as vibrations per second.

  So, Frequency = 36/60 = 0.6 Hz

  Time period is defines as time taken for 1 vibration,

 So, Time period = 60/36 = 1.67 seconds.

The period of vibration of a simple pendulum is 1.67 s.

The frequency of vibration of a simple pendulum is 0.6 Hz.

The frequency of vibration of a simple pendulum is the number of complete oscillation of the pendulum per second.

F = n/t

where;

F = 36/60

F = 0.6 Hz

The period of vibration is the inverse of frequency of vibration.

T = 1/f

T = 1/0.6

T = 1.67 s

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A.) Light waves can travel through a vacuum.

The answer is A, light waves eliminate

Answer:

5488 Joules

Explanation:

Use the formula for the potential energy:

[tex]E_p = mgh = 70kg\cdot 9.8\frac{m}{s^2}\cdot 8m = 5488 J[/tex]

Hi there,

the following injuries that include instability of the knee with pain and swelling is ACL Tear.

The ACL tear is common especially in sports like football one wrong move and you fall and tear your ACL

Hope this helped :)

Have a great day

Nicolaus Copernicus

Nicolaus Copernicus  is the scientist who put forward a model which placed sun instead earth as the center of the universe

Elements on the periodic table are identified by their atomic number (Z), which indicates the number of protons in an atom's nucleus, and by their unique chemical symbol that may derive from their English or Latin names.

Identifying Elements on the Periodic Table

The periodic table is a tabular arrangement of chemical elements, organized by their atomic number, electron configurations, and recurring chemical properties. Each element on the periodic table is represented by a unique chemical symbol, which is a one-, two-, or three-letter abbreviation of its name. The atomic number, represented by the symbol Z, defines the identity of an element by indicating the number of protons in the nucleus of an atom of that element.

For each element listed in the periodic table, you can find its atomic number above the chemical symbol. This is central to the element's identity, as no two different elements share the same number of protons. Additionally, the element's atomic mass is included in the entry, giving an indication of the relative mass of an atom of that element compared to other elements.

Historical elements with symbols based on their Latin names, such as Fe for iron (ferrum) and Pb for lead (plumbum), may seem unrelated to their English names. The periodic table also helps in identifying elements as metals, nonmetals, and organizes them into groups and periods where elements exhibit similar properties.

Given that:

 Energy of bulb  (Work ) = 30 J,

 Time (t) = 3 sec

The power consumption =  ?

 We know that, Power can be defined as rate of doing work

              Power (P) = Work(Energy supplied) ÷ time

                               = 30 ÷ 3

                              = 10 Watts

The power consumption is 10 W.

The answer is the velocity that is in a straight horizontal line.

The second one as the velocity doesn't change over time.

Final answer:

In order to encourage the star athlete to be more inclusive and supportive, start by acknowledging their talent and having a gentle conversation about their behavior. Emphasize the importance of teamwork and suggest activities to foster inclusivity.

Explanation:

To encourage the star athlete on your sports team to be more inclusive and supportive of all the players, you could have a dialogue with them. Start by acknowledging their talent and achievements and express your admiration for their skills. Then, gently bring up the issue of their behavior towards other players and explain how it affects team dynamics.

Next, emphasize the importance of teamwork and how their support can uplift and motivate other players. Share examples of successful teams that have thrived because of a positive and inclusive team culture. Encourage them to recognize and appreciate the strengths of their teammates.

Suggest activities or team-building exercises that can help foster inclusivity and encourage interactions among all team members. Additionally, remind them of the power of their influence as a star athlete and how they can set an example for others by embracing a supportive and inclusive attitude.

Answer:

The correct answer is option B, tenth

Explanation:

ASPIRE test is basically given by students of ninth and tenth grade as pre-test to the ACT test. ACT ASPIRE test can be given from third grade till tenth grade. The scoring obtained in this test helps the student, teachers and parents to monitor the preparation of their kids towards completing a successful ACT test.  

Apart from ninth and tenth grade , students belonging to lower grades (i.e from 3rd grade to 8th grade) can opt for online test.  However, higher grades can opt for both online and paper based test.

Students can take the Aspire test in the ninth and grade Tenth. The correct option is B.

The Aspire test is an assessment designed to measure students' readiness for college and careers. It evaluates their skills in English, math, reading, and science. The test is administered by the ACT organization and is typically taken by students in grades 3-10.

While students in ninth grade may be eligible to take the Aspire test, it is not the earliest grade at which it can be taken, and thus option A. First is not correct. The Aspire test is not typically administered to students in the first grade.

Option C. Eleventh and option D. Twelfth are not correct because by these grades, students may have already taken the ACT or SAT, which are the college entrance exams typically taken during the junior and senior years of high school.

Therefore, the correct option is B. Tenth, as this is the grade level at which most students take the Aspire test.

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Two waves interfere when they run into each other.

The barrier reflects waves that run straight into it. It acts as a wave source and sends wave pulses back up the page towards the incoming waves.

Imagine a loose string tied to a wall. Someone sends two consecutive pulses along the string towards the wall. The first pulse gets reflected right away. It will travel backward towards the person holding the string. Along its way, it will run into the second pulse. The two pulses will interfere. The wall will make the reflected pulse out of phase with the second one. They will end up creating a destructive interference.

So is the case with the water waves running into the barrier. The barrier will send incoming waves back toward where they came from. Reflected waves interfere with incoming ones.

11.86 years, or around that time it would take about 12 years.

The period of Jupiter's orbit around the sun is  11.862 Earth years.

Kepler's laws of planetary motion are a set of three laws that describe the motion of planets around the sun. They were formulated by the German mathematician and astronomer Johannes Kepler in the early 17th century, based on observations made by the astronomer Tycho Brahe.

Kepler's first law, also known as the law of orbits, states that the planets move in elliptical orbits around the sun, with the sun located at one of the foci of the ellipse.

Kepler's second law, also known as the law of areas, states that the line connecting a planet to the sun sweeps out equal areas in equal times. This means that a planet moves faster when it is closer to the sun and slower when it is farther away.

Kepler's third law, also known as the law of harmonies, relates the period and distance of a planet's orbit to its mass and the mass of the sun. Specifically, it states that the square of a planet's orbital period is proportional to the cube of its average distance from the sun.

These laws helped to revolutionize the field of astronomy and laid the foundation for the later development of Isaac Newton's laws of motion and gravitation.

Here in the question,

We can use Kepler's third law of planetary motion to calculate the period of Jupiter's orbit around the sun, which relates the period of an orbit to the average distance of the planet from the sun.

Kepler's third law states that:

(T^2) / (R^3) = (4π^2) / G,

where T is the period of the orbit, R is the average distance between the planet and the sun, G is the gravitational constant, and π is pi.

To solve for T in Earth years, we need to convert Jupiter's average distance from AU to kilometers (km) and then to meters (m), and we need to convert Earth years to seconds.

1 AU = 149,597,870.7 km

1 year = 365.25 days = 31,557,600 seconds (approx.)

So, Jupiter's average distance from the sun is:

R = 5.2025 x 149,597,870.7 km = 778,547,200 km = 7.785 x 10^11 m

Substituting the values into Kepler's third law, we get:

(T^2) / (7.785 x 10^11 m)^3 = (4π^2) / 6.6743 x 10^-11 m^3/(kg s^2)

Solving for T, we get:

T = ∛[(7.785 x 10^11 m)^3 / ((4π^2) / 6.6743 x 10^-11 m^3/(kg s^2))] = 11.862 Earth years

Therefore, the period of Jupiter's orbit around the sun is approximately 11.862 Earth years.

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Firstly, to find speed you need to remember the speed formula:

Speed = Distance ÷ Time

You can do it by doing 2800 ÷ 2 but that gives m/h (metres per hour)

So to convert hours into seconds, you multiply 2 by 7200 (amount of second in 2 hours:

2 * 7200 = 14400 seconds

Now we can do distance ÷ time by plugging the values in:

2800 ÷ 14400 = [tex]\frac{7}{36}[/tex] ≈0.194

Answer:

a = -.51 m/s²

coefficient of friction = .05

fk= 12.25 N

Explanation:

mass = 20 + 5kg

weight = 25kg ·9.8 = 245 N

There are many ways to do this I am sure but I did this:

1.  found a by using vf²=vi²-2aΔx. accel is - because it is slowing down.

started at 4.5 m/s, final = 0 and Δx=20....a=-.51 m/s²

2.  the force acting on the object is the friction force which has to equal the mass(accel).

-fk (going to left on free body diagram) = ma

-mu·n = ma

-mu·245N = 25 (-.51)

mu=.05

fk= .05(245N) = 12.25 N

The kinematics and Newton's second law allow to find the results for the questions of the movement of the child and the skateboard are:

  a) the deceleration is a = 0.51 m / s²

  b) The friction force is: fr = 12.75 N

  c) The friction coefficient is equal to: μ = 0.052

Given parameters

To find

    a) Acceleration.

    b) The friction force.

    c) The coefficient of friction.

a) Kinematics studies the movement of bodies, finding relationships between their position, speed and acceleration.

Since the child ends up at rest, his final velocity is zero (v = 0), let's use the relation.

       v² = v₀² - 2 a x

       0 = v₀² - 2ax

       a = [tex]\frac{v_o^2}{2x}[/tex]  

       a = [tex]\frac{4.5^2 }{2 \ 20}[/tex]

       a = 0.51 m / s²

b) Newton's second law states that the net force is proportional to the product of the mass and the acceleration of the body.

A free-body diagram in a diagram of the forces without the details of the body, in the attached we can see the free-body diagram of the system.

Let's write Newton's second law, since the boy and the scooter do not separate, we use the total mass.

y-axis

     N-W = 0

     N = W

     N = (M + m) g

     N = (20 +5) 9.8

     N = 245 N

x-axis

     fr = [tex]m_{total} \ a[/tex]  

     Fr = (20+ 5) 0.51

     fr = 12.75 N

c) Friction force is a macroscopic force of the interactions between the two surfaces and has the formula.

       fr = μ N

       μ = [tex]\frac{fr}{N}[/tex]

       μ = 12.75 / 245

       μ = 0.052

In conclusion, using kinematics and Newton's second law we can find the results for the questions of the movement of the boy and the skateboard are:

  a) The deceleration is a = 0.51 m / s²

  b) The friction force is: fr = 12.75 N

  c) The friction coefficient is equal to: μ = 0.052

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Answer:

OR

                                W = F.S

                                W  = F. S cos Θ

When cos Θ = 0° ; cos 0 = 1

Answer:

The angle between the force and displacement is 0°.

Explanation:

According to the experiments done and currently verified, in vacuum (this means there is not air or any fluid), all objects in free fall experience the same acceleration, which is the acceleration of gravity.  

Now, in this case we are on Earth, so the gravity value is [tex]9.8\frac{m}{s^{2}}[/tex]  

Note the objects experience the acceleration of gravity regardless of their mass.

Nevertheless, on Earth we have air, hence air resistance, so the afirmation "Free fall is a situation in which the only force acting upon an object is gravity" is not completely  true on Earth, unless the following condition is fulfiled:

If the air resistance is too small that we can approximate it to zero in the calculations, then in free fall the objects will accelerate downwards at [tex]9.8\frac{m}{s^{2}}[/tex] and hit the ground at approximately the same time.  

Alright well the Answer to your question is A). Screw

Hope this helps have a nice day : )

If u want i can explain why

Answer:

answer is screw my good fellow

Explanation:

Answer:

3.99 kg

Explanation:

The period of a harmonic oscillator is given by:

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

where

m is the mass attached to the spring

k is the spring constant

In this problem, we know:

k = 712 N/m

T = 0.47 s

Therefore, we can re-arrange the equation to find the mass that should be attached to the oscillator:

[tex]m=\frac{k T^2}{(2 \pi)^2}=\frac{(712 N/m)(0.47 s)^2}{(2 \pi)^2}=3.99 kg[/tex]

A mass of 3.97 kg should be attached.

The student asks what mass should be attached to a spring for a horizontal spring oscillator to oscillate with a period of 0.47 seconds, given the spring constant is 712 N/m and there is no friction. To find the mass, we use the formula for the period T of a simple harmonic oscillator: T = 2π√(m/k), where m is the mass in kilograms and k is the spring constant in newtons per meter. Rearranging the formula to solve for m gives us m = (T/(2π))2 × k.

Plugging in the given values:

Calculate (0.47 / (2π))2 = 0.005577... (rounded to nine decimal places).

Multiply this by the spring constant 712 N/m gives us 0.005577 × 712 = 3.970544 kg.

Therefore, the mass that should be attached to the spring is approximately 3.97 kg.