A kid with a mass of 30 kg slides down a slide 2.5 meters high from rest.
What was his speed at the bottom?
If his speed was only 1 m/s at the bottom, how much energy was lost due to friction?

The frequency of light when it reaches Earth is approximately 4.988 x 10^14 Hz.

Explanation:-

Given:

Emitted frequency of light, f = 5.000 x 10^14 Hz,

Speed of the galaxy receding from Earth, v_src = 4500 km/s.

We need to convert the speed of the galaxy from km/s to m/s:

v_src = 4500 km/s * (1000 m/km)

v_src = 4.5 x 10^6 m/s

Plugging the given values into the Doppler effect formula:

f' = (5.000 x 10^14 Hz) * (3.00 x 10^8 m/s + 0 m/s) / (3.00 x 10^8 m/s + 4.5 x 10^6 m/s)

Simplifying the expression:

f' = (5.000 x 10^14 Hz) * (3.00 x 10^8 m/s) / (3.00 x 10^8 m/s + 4.5 x 10^6 m/s)

f' ≈ 4.988 x 10^14 Hz

Therefore, the frequency of light when it reaches Earth is approximately 4.988 x 10^14 Hz.

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Answer:purple

Explanation:

bc it’s cool

Answer:

yes,

Explanation:

because a compound contains two or more chemical elements chemically bond together.

You have the following expression:

subtract 5 both sides of the equation:

Take into account that the absolute value of any number is equal to the same number but positive.

Then, you have:

and

Then, solve the previous equations:

5x - 8 = -27 add 8 both sides

5x = -27 + 8

5x = -19 divide by 5

x = -19/5

5x - 8 = 27 add 8 both sides

5x = 27 + 8

5x = 32 divide by 5

x = 32/5

Then, the solutions of the given equations are:

x = -19/5

x = 32/5

Answer:

Yellow

Explanation:

So while red, green and blue light shine upon the shirt, only red and green light will reflect from it. Red and green light striking your eye always gives the appearance of yellow; for this reason, the shirt will appear yellow.

Answer:

greater then five

Explanation:

Answer:

Equal to 5

Explanation:

Newton's third law. Hit the baseball or kick the soccer ball with a small amount of force. The ball will not travel very far. Then, hit or kick the ball with a large amount of force and watch what happens. The ball will have an equal and opposite reaction to the amount of force it his hit with.

The angle above the surface of the water that the sunlight hits is approximately 48.6 degrees.

To answer your question, we need to find the angle of incidence for sunlight as it enters the water. We'll use Snell's Law, which states:

n1 * sin(θ1) = n2 * sin(θ2)

Here, n1 is the refractive index of air (approximately 1), n2 is the refractive index of water (approximately 1.33), θ1 is the angle of incidence we want to find, and θ2 is the angle of refraction (74 degrees below the surface).

1 * sin(θ1) = 1.33 * sin(74°)
sin(θ1) = 1.33 * sin(74°)

Now, we'll solve for θ1:

θ1 = arcsin(1.33 * sin(74°))

After calculating, we get:

θ1 ≈ 48.6°

So, the sunlight hits the surface of the water at an angle of approximately 48.6 degrees above the surface.

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1: Average tangential acceleration = (12 m/s - 0 m/s) / 3.3 s ≈ 3.64 m/s²

2: radius = 3.64 m/s² / 11 rad/s² ≈ 0.331 m

3: θ = 0.5 * 11 rad/s² * (3.3 s)² ≈ 59.67 radians

4: The ant has traveled approximately 19.78 meters along the arc of the tire during the given time interval.

1: The average tangential acceleration of the tire can be determined using the formula:

Average tangential acceleration = (final tangential velocity - initial tangential velocity) / time

Given that the ant's speed increases from zero to 12 m/s in 3.3 seconds, the initial tangential velocity is 0 m/s and the final tangential velocity is 12 m/s. Plugging these values into the formula, we get:

Average tangential acceleration = (12 m/s - 0 m/s) / 3.3 s ≈ 3.64 m/s²

2: The radius of the tire can be determined using the formula:

Average tangential acceleration = rotational acceleration * radius

Given that the rotational acceleration of the wheel is 11 rad/s² and the average tangential acceleration is 3.64 m/s², we can rearrange the formula to solve for the radius:

radius = average tangential acceleration / rotational acceleration

Plugging in the values, we get:

radius = 3.64 m/s² / 11 rad/s² ≈ 0.331 m

3: The angle the ant has turned during this time interval can be calculated using the formula:

θ = 0.5 * rotational acceleration * (time)²

Plugging in the given values, we get:

θ = 0.5 * 11 rad/s² * (3.3 s)² ≈ 59.67 radians

4: The distance the ant has traveled along the arc during this time interval can be calculated using the formula:

Distance = radius * θ

Plugging in the values, we get:

Distance = 0.331 m * 59.67 radians ≈ 19.78 meters

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The negatively charged balloon contains an excess of elections.

Like charges repel, so the electrons in the balloon repel the electrons in the paper.

Therefore, a part of the paper would gain a slightly positive charge.

Opposite charges attract, so the paper would want to stick to the balloon/will follow the balloon.

Answer: Static electricity

Explanation:

What are the following statements?

Answer:

The star's luminosity rises above its previous level. Because it is so cool, the surface will be red, and it will be much farther away from the center than it was during the earlier stages of star evolution. Despite its lower surface temperature, the red giant has a large surface area, which makes it very luminous.

The radioactive decay equation for thorium-232 is  \(Th^{232} - > Ra^{238} + He^{4}\). The radioactive radiation activity of 10 g of thorium can be found by calculating the number of thorium-232 nuclei and then using the decay constant. The activity after 10 years can be determined using the radioactive decay law and the initial activity.

a) The radioactive decay equation for thorium-232 (\(Th^{232}\)) can be written as follows:

\(Th^{232} - > Ra^{238} + He^{4}\)

In this equation, thorium-232 decays into radium-228 by emitting an alpha particle (helium-4 nucleus). This process is a type of alpha decay.

b) To find the radioactive radiation activity of 10 g of thorium, we need to use the concept of activity. The activity (A) of a radioactive substance is defined as the rate at which radioactive decay occurs. It is measured in becquerels (Bq) or disintegrations per second.

To calculate the activity, we need to consider the number of radioactive nuclei present in the sample and the decay constant. The decay constant (λ) is related to the half-life (T1/2) of the isotope by the equation:

λ = ln(2) / T1/2

For thorium-232 with a half-life of 1.4 * \(10^{10}\) years, the decay constant is approximately λ = ln(2) / (1.4 * \(10^{10}\) years).

To find the number of radioactive nuclei (N) in 10 g of thorium, we can use Avogadro's number and the molar mass of thorium-232. The molar mass of thorium-232 is 232 g/mol.

N = (10 g) / (232 g/mol) * (6.022 * \(10^{23}\) nuclei/mol)

Now, we can calculate the activity (A) using the equation:

A = λ * N

c) To find the activity after 10 years, we use the radioactive decay law, which states that the activity of a radioactive substance decreases exponentially over time. The remaining activity (A_t) after a time t is given by:

A_t = A_0 * e^(-λ * t)

Where A_0 is the initial activity at t = 0.

To calculate the activity after 10 years, we substitute the appropriate values into the equation, including the initial activity calculated in part b, and evaluate A_t.

In summary, the radioactive decay equation for thorium-232 is  \(Th^{232} - > Ra^{238} + He^{4}\) To find the activity of 10 g of thorium, calculate the initial activity using the decay constant and the number of nuclei. Finally, to determine the activity after 10 years, use the radioactive decay law with the appropriate values.

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The sample contains approximately 0.087 moles of oxygen gas.

Under STP (Standard Temperature and Pressure) conditions, a sample of oxygen gas with a volume of 2.1 L can be used to calculate the number of moles present.

By applying the ideal gas law equation, PV = nRT, where P represents pressure, V is volume, n is the number of moles, R is the gas constant, and T is the temperature, we can determine the number of moles.

Converting the volume from liters to cubic meters, we find V = 0.0021 m³. At STP, the pressure is 1 atm, which is equivalent to 101325 Pa, and the temperature is 273.15 K. After substituting the given values into the equation, we can calculate the number of moles as follows:

n = (1 atm) * (0.0021 m³) / (0.0821 Latm/(molK)) * (273.15 K)

= 0.0874 moles

Therefore, the sample contains approximately 0.0874 moles of oxygen gas. It is important to note that the answer is rounded to three decimal places, resulting in 0.087 moles.

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Answer:

 W = 500 J

Explanation:

Work is defined by

         W = F . x

if we develop the dot product

         W = F x cos θ

where is the angle between the force and the displacement, in this case the angle is zero, so cos 0 = 1

          W = F x

indicate that each person applies a force of 500 N, so the total force is

         F = 1000 N

let's reduce the distance to the SI system

          x = 50 cm = 0.50 m

let's calculate

          W = 1000 0.50

          W = 500 J

A tug-of-war that results in one team pulling the other across the line is an example of reaction force.

A reaction force  can be described as the consequence of an action force which is opposite in direction.

It should be noted that the  Newton's third law of motion is the one that deals with these two forces, which  can be considered as the action and reaction forces however the Newton's third law made us to understand that for every action, there is an equal and opposite reaction, hence the case above can be seen as an example of reaction force.

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Answer:

6227.866 N

Explanation:

F = G . m(goku) . m(planet) / d²

F = 6.674 x 10-¹¹ x 62 x 1.458 . 10¹⁵ / 31²

F = 6227.866 N

During time interval t2, the voltage is decreasing from the maximum value to 0, as the magnetic flux linkage with the coil is reduced.

When an isolated magnetic North pole is discovered and dropped through the set-up (magnet through a coil experiment), there is a change in magnetic flux linkage within the coil. Therefore, the induced electromotive force (EMF) will cause a voltage pattern to form.The Faraday's Law of Electromagnetic Induction states that when there is a change in magnetic flux linkage within a coil, an EMF is induced in the coil.

In this scenario, the magnetic flux linkage increases as the magnetic North pole enters the coil and decreases when it exits the coil, which will result in a change in the direction of the induced EMF within the coil.The voltage pattern obtained from the experiment depends on the rate at which the magnetic North pole is dropped through the set-up and the number of turns of the coil.

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Answer:

11×10⁵ J

Explanation:

From the question given above, the following data were obtained:

Mass (m) = 1000 kg

Height (h) = 110 m

Acceleration due to gravity (g) = 10 m/s²

Potential energy (PE) =?

The potential energy of the roller coaster can be obtained as follow:

PE = mgh

PE = 1000 × 10 × 110

PE = 11×10⁵ J

Therefore, potential energy of the roller coaster is 11×10⁵ J

Its magnetic axis does not lie in the same direction as its rotation axis. Uranus is the seventh planet from the Sun and the third largest planet in our solar system. Option e is Correct.

It is unique in several ways that distinguish it from every other planet in our solar system. One of these characteristics is that its magnetic axis is tilted almost 90 degrees to the plane of its orbit. The magnetic axis of a planet is the direction in which its magnetic field is pointed. The magnetic axis of a planet is usually aligned with its rotation axis, but this is not the case for Uranus. In fact, Uranus's magnetic axis is tilted by about 59 degrees relative to its orbit, which is much more than any other planet in our solar system.

In contrast, the other characteristics listed in the options are not unique to Uranus. Every planet in our solar system has its own set of moons, and the composition of their atmospheres varies. The orbits of the planets are also tilted with respect to the Sun, and some of them have magnetic fields that are tilted with respect to their rotation axes. However, the tilt of Uranus's magnetic axis is the most extreme of any planet in our solar system.  

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the net impulse that acted on the ball =500 N.s if 100 kg ball is initially traveling at 10 m/s. If the ball experiences a constant external force that increases the ba velocity to 15 m/s .

The normal force acts in a direction normal to the surface interaction between objects. Friction is a force that opposes motion on surfaces. Other examples of non-fundamental forces include the elastic force, tension, and frame-dependent forces .

to make someone do something that they do not want to do, for example by using or threatening to use violence. force someone to do something: He claims that police officers forced him to sign a confession.

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We are given that an object falls with an acceleration of -6 miles/h/s. To determine the initial velocity we will use the following motion:

Where:

Now, we solve for the initial velocity by subtracting "at" from both sides:

Now, we plug in the values:

Now, we solve the operations:

Therefore, the initial velocity is 50 mi/h.

Answer:

To solve this problem, we can use vector addition. We can represent the velocity of the boat as a vector pointing east with magnitude 7 mph, and the velocity of the wind as a vector pointing northwest with magnitude 10 mph.

To add these two vectors, we can break the wind velocity vector into its x and y components, using trigonometry. Since the vector is pointing northwest, we know that it makes a 45 degree angle with both the x and y axes. Therefore, the x component is:

10 mph * cos(45) = 7.07 mph

and the y component is:

10 mph * sin(45) = 7.07 mph

Now we can add the x component of the wind velocity vector to the velocity of the boat, since they are both pointing in the same direction (east):

7 mph + 7.07 mph = 14.07 mph

The y component of the wind velocity vector is pointing north, while the velocity of the boat is pointing east, so we cannot simply add them. Instead, we can use the Pythagorean theorem to find the magnitude of the resultant vector:

sqrt(14.07^2 + 7.07^2) = 15.78 mph

The direction of the resultant vector can be found using trigonometry. The angle between the resultant vector and the east direction is:

tan^-1(7.07/14.07) = 26.56 degrees

Therefore, the boat is sailing at a speed of 15.78 mph in a direction that is 26.56 degrees north of east.

Explanation:

Meteorites are rocks that originate from space and fall to Earth. They contain ancient material that has remained unchanged since the formation of the solar system billions of years ago.

While meteorites can come from various regions of the solar system, including the asteroid belt, some of them originate from celestial bodies such as the Moon and Mars.

Impacts on the Moon and Mars can cause fragments to be ejected into space, and these fragments may eventually collide with Earth, becoming meteorites.

Moon meteorites possess distinct compositions that differentiate them from terrestrial rocks, while Mars meteorites often exhibit minerals or compounds that are rare on Earth but align with the Martian environment.

The discovery of these meteorites enables scientists to study the Moon and Mars without physically visiting them, providing valuable insights into the solar system's history and composition.

Scientists worldwide continue to investigate meteorites, unraveling the secrets of our cosmic neighborhood.

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Answer:

Based on all current evidence, if Venus had been born at Earth's distance from the Sun, then Venus today would probably have an atmosphere similar to Earth's.

Explanation:

The size and mass of Venus and Earth are almost identical, which means that if Venus had been born at Earth's distance from the Sun (known as an 'habitable' or 'Goldilocks' zone) instead of its current distance, it would probably have retained its atmosphere and water. Today, Venus is the hottest planet in the Solar System, with surface temperatures reaching 864°F (462°C). This means that any water on the planet's surface would evaporate rapidly, creating a powerful greenhouse effect that has kept Venus hot and dry for billions of years.

WHY DO YOU KEEP DELETING MY ANSWER! I'M DOING NOTHING WRONG, I WROTE ALL OF WHAT I PUT BY MYSELF. WHAT AM I DOINGGGGG

The given statement "scientists are concerned about the decrease in ozone is allowing more ultraviolet" is true because ozone is a molecule made up of three oxygen atoms that exist in the Earth's atmosphere. It's a form of oxygen that absorbs almost all of the Sun's harmful ultraviolet light.

Ultraviolet rays are very harmful to humans, causing skin cancer, immune system breakdowns, and cataracts in the eyes. When the ozone layer is damaged or thinned, it can allow more ultraviolet rays to penetrate the atmosphere, which is why scientists are so concerned about ozone depletion.What are the impacts of ozone depletion?It is estimated that a 1% reduction in the ozone layer increases the incidence of non-melanoma skin cancer by 2%.A decrease of 10% in the ozone layer may result in a 20% increase in the incidence of skin cancer.The thinning of the ozone layer may result in a decrease in plant production, which may result in food supply shortages.A decrease in ozone may have an impact on phytoplankton, which play a crucial role in ocean food webs. These tiny creatures consume carbon dioxide and produce half of the world's oxygen. As phytoplankton numbers decline, ocean ecosystems may change, affecting everything from fish populations to weather patterns.

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Example of an elastic product: Smartphone

Explanation: A smartphone is an example of an elastic product. When the price of smartphones decreases, consumers tend to buy more of them, and when the price increases, consumers tend to buy fewer.

Example of an inelastic product: Prescription medication

Explanation: Prescription medication is an example of an inelastic product. Inelastic goods are those for which changes in price have little impact on the quantity demanded.

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