12. In which of the positions shown in the picture, will Joshua have both potential and kinetic energy?​

Answer:

80m/s

Explanation:

to find it you have to work it out by using the formula distance divided by speed to find time.

The time taken by the skateboarder to reach the bottom 120m away is 80 sec.

Acceleration may be defined as the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities as it has both magnitude and direction.

When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing. If an object is speeding up and moving in a positive direction, it has a positive acceleration.

According to the question,

Speed of the skateboarder = 1.5 m/s

The total distance needs to be traveled = 120m

Total time taken =?

The Formula for calculating time is as follows:

Therefore, the time taken by the skateboarder to reach the bottom 120m away is 80 sec.

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Answer:

C.

Explanation:

Answer:

this is confusing

Explanation:

Explanation:

Given that,

Mass of a skier, m = 55 kg

The vertical distance between start and finish is 10 m.

(a) The potential energy of a skier is given by :

[tex]E=mgh\\\\E=55\times 9.8\times 10\\\\=5390\ J[/tex]

(b) When she reaches the bottom of the hill, the potential energy is converted to kinetic energy. So,

[tex]5390=\dfrac{1}{2}mv^2\\\\v=\sqrt{\dfrac{2\times 5390}{55}} \\\\v=14\ m/s[/tex]

Hence, her potential energy is 5390 J and at the bottom of the hill she is moving with a speed of 14 m/s.

Answer:

~ 314 N

Explanation:

F = ma

  = 32 ( 9.81) = ~ 314 N

Answer:

Pensamiento crítico.

Explicación:

El pensamiento crítico es ese tipo de pensamiento que surge en un individuo o en un proceso, fomentado por la indagación y el cuestionamiento. Desde el punto de vista de un estudiante, el aprendizaje basado en la indagación se centra en investigar un problema utilizando un método científico. En este tipo de aprendizaje, el razonamiento se realiza a la luz de la evidencia y se resuelve el problema para extraer una conclusión, la cual debe ser defendida mediante un razonamiento fuerte. Este tipo de indagación ayuda al individuo a aprender cosas nuevas.

Answer: Core muscles protect the spine and keeps it stabilized. Also they can help control movements such as walking and standing. The core helps transfer energy and help us move in different directions. It's important to have a strong set of core muscles.

Explanation:

Answer:

The core muscles stabilize and protect the spine. They help control all movements and make it possible for us humans to walk and stand up right. The core helps us transfer energy, shift our body weight and reach/move in different directions. It is important to have a strong set of core muscles because it makes everyday activities easier.  

Explanation:

Answer: There is no pic homie

Explanation:I am on the same question, so I can’t help :(

Answer:

Because in series, current flow through a single path only as it is same. Hence,if one fails the entire circuit breaks and other bulbs are switched off.

Explanation:

Answer:

I do belive that it is B hrs cn I an gn

Answer:

the rocket will go up

Explanation:

there is less force pulling down on the rocket.

100N > 75N

Answer:

It is cause by radiation that's the answer

Explanation: the heat project sun rays towards the popcorn which causes it to pop

Period, being a time, is measured in units of time such as seconds, hours, days or years. The period of orbit for the Earth around the Sun is approximately 365 days; it takes 365 days for the Earth to complete a cycle

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The horizontal velocity : vox = 1.33 m/s

Given

time 0.75 s

distance = 1 m

Required

the horizontal velocity

Solution

vox = horizontal velocity

x = distance

Can be formulated :

x = vox . t

Input the value :

1 m = vox . 0.75s

vox = 1 : 0.75

vox = 1.33 m/s

Answer:

By the end of the war, Mexico would lose almost half its territory to the U.S., including lands from Texas to California. The war was a key event in American History as it fulfilled its 'manifest destiny', encompassing land from the Atlantic Ocean to the Pacific.

Explanation:

Answer:

Answer: Elementary Entities are any of several entities, such as electrons, neutrons, or protons, that are less complex than atoms and are regarded as the constituents of all matter.

Oxygen is more chemically reactive than nitrogen because Oxygen needs to gain only 2 electrons to have a full octet, while nitrogen needs to gain 3. The correct option is A.

The electrons are the spinning objects around the nucleus of the atom of the element in an orbit.

Valence electrons are the electrons present in the outermost shell of an atom. They can easily be determined by the number of valence electrons in an atom by looking at the specific group in the periodic table.

The fewer number of electrons in the valance shell, the more reactive is the element.

Oxygen needs to gain only 2 electrons to have a full octet, while nitrogen needs to gain 3.

Thus, Oxygen is more chemically reactive than nitrogen.

Then the correct option is A.

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Answer:

A

Explanation:

Apex built different

Answer:

It depends of the mass and weight of each of the materials

Explanation:

Answer: How it was created, The frequency of the waves, and is the water salty enough to kill someone.

Explanation:

Just from my brain.

Answer: the ecosystem , differnt species of fish, and ship wrecks

Explanation:

:)

Answer:

0.84

Explanation:

m = Massa balok

g = Percepatan gravitasi

[tex]\theta[/tex] = Sudut kemiringan

[tex]\mu[/tex] = Koefisien gesekan statik antara balok dan bidang miring

Gaya balok karena beratnya diberikan oleh

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

Gaya gesekan diberikan oleh

[tex]f=\mu mg\cos\theta[/tex]

Kondisi dimana balok mulai bergerak adalah ketika gaya balok akibat beratnya sama dengan gaya gesek pada balok.

[tex]mg\sin\theta=\mu mg\cos\theta\\\Rightarrow \mu=\dfrac{mg\sin\theta}{mg\cos\theta}\\\Rightarrow \mu=\tan\theta\\\Rightarrow \mu=\tan40^{\circ}\\\Rightarrow \mu=0.84[/tex]

Koefisien gesekan statik antara balok dan bidang miring adalah 0.84.

Answer:

Explanation:

The pendulum is at rest ( or balance due to the equal action of opposing forces).

Answer:

Equilimbru or maximum displacement is question.

Answer:

true..........................

Speed and velocity use the same formula for calculations. However, an object can have a different average speed and average velocity because of displacement. This is true statement.

As a vector quantity with both magnitude and direction, velocity has both. This term refers to the speed at which an object is moving or shifting positions.

Since speed is a scalar quantity, it lacks direction. It indicates the rate of a moving thing. When a particle's speed is high, it indicates that it is travelling quickly, and when it is low, it indicates that it is going slowly.

The displacement of a body during a period of time divided by the passage of time yields the average velocity of the body during that period.

The distance travelled by a body in a given amount of time, divided by the amount of time, is the body's average speed.

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We are given:

Mass of Neptune = 1.03 * 10²⁶ kg

Distance from the center of Neptune (r) = 2.27 * 10⁷

now, computing the value of the acceleration due to gravity (g)

Finding g:

We know the formula:

g = G(mass of planet) / (r)²

g = [6.67 * 10⁻¹¹ * 1.03*10²⁶] / (2.27*10⁷)                      [since G is 6.67*10⁻¹¹]

g = (6.87 * 10¹⁵) / (5.15 * 10¹⁴)

which can be rewritten as:

g = (6.87 * 10¹⁵ * 10⁻¹⁴) / 5.15

g = (6.87 * 10¹⁵⁻¹⁴) / 5.15

g = (6.87/5.15) * 10

g = 1.34 * 10

g = 13.4 m/s² (approx)

Answer:

Your answer should be B. a parabola.

Explanation:

The path of the projectile in the absence of friction is a parabola. Therefore, option (b) is correct.

Projectile motion can be described as a form of motion experienced by a projectile that is projected near the surface of the earth and moves along a curved path under the action of gravity. This curved path is to be a parabola, but may also be a straight line in special cases when the projectile is thrown directly upwards.

The study of such motions is known as ballistics and the only force that is actively exerted is gravity, which acts downward, thus giving the object a downward acceleration toward the Earth’s center of mass.

No external force is required to maintain the horizontal velocity component of the object's motion because of the object's inertia. Other forces, such as aerodynamic drag or internal propulsion need additional analysis.

Therefore, the path of an object or projectile is generally parabola in the absence of friction.

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Answer:

A

Explanation: A is a example of Air resistance force, which is a contact force.

Answer:

The phases occur because the Sun lights different parts of the Moon as the Moon revolves around the Earth. That means the reason we see different phases of the Moon here on Earth is that we only see the parts of the Moon that are being lit up by the Sun.