Explain why a basketball doesn’t bounce the same height each time you drop it.

Answer:

529.2 N

Explanation:

First of all, we need to convert the mass of the person into kg. We have:

1 pound = 0.45 kg

So

[tex]m=120 p \cdot 0.45 kg/p = 54 kg[/tex]

Now the force exerted by the ground on the man is equal to the weight of the man:

[tex]F=mg[/tex]

where

g = 9.8 m/s^2 is the acceleration due to gravity

Substituting

[tex]W=(54 kg)(9.8 m/s^2)=529.2 N[/tex]

Acceleration is a vector quantity because it has both magnitude and direction.

Acceleration is a vector quantity that describes how an object's velocity changes over time in both magnitude and direction. It has both magnitude and direction, making it a vector, and is measured in meters per second squared.

Acceleration is a vector quantity which means that it has both magnitude and direction. Acceleration provides information about how the motion of an object changes over time. It is always in the same direction as the change in velocity, which is also a vector. Since velocity can change in magnitude (speed) or direction, acceleration can be a change in speed, direction, or both. The SI unit for acceleration is meters per second squared (m/s²). An important aspect to note is that acceleration does not convey the actual velocity of the object; it only describes how the velocity is changing.

The total amount of energy in a closed system must stay constant.

Answer:

The system's energy can not be created, or destroyed. It's transformable from one shape to another. The energy stays conserved in a closed system. It is isolated in the surrounding area.

Answer:    desk, water, helium and clouds

Explanation:

Answer:

Desk

Water

Cloud

Helium

Explanation:

Edge 2023

Answer:

232 J

Explanation:

Energy is conserved.  All of the potential energy at the highest point of the swing is converted to kinetic energy at the lowest point.

Answer:

I think it i either the 1st one with all the arrows pointing to the ball because it has some speed so it is going fast horizontally 2) the ball has to stay on the ground so that's where the gravitational pull comes in (the arrow pointing down and pointing up). 3) when the ball is moving horizontally  the air which is pushing the ball from the left pushes it back a little hence slowing it a little.

Explanation:

This is my guess anyways, feel free to choose this answer my second opinon was the second one which is the one with the arrow pointing down and arrow pointing right and left ( the one which says movement of the ball )

Answer:

Option A)

Explanation:

Here we know that ball is moving horizontally so the force on the ball perpendicular to the plane must be balanced

We can say that gravitational force "mg" is balanced by the normal force due to ground. Which shows that two equal and opposite arrows must be there on ball in vertical direction.

Now in horizontal direction there may be unbalanced force in two directions.

One of the force may be due to air drag and friction on the ground. While other force is due to some external agent.

So here correct answer is represented by first figure or we can say it is given by

Option A)

A piece of blue paper appears blue because the paper absorbs all colors of light except blue. (b)

So any light that bounces off of the paper and enters your eye must be blue light !

A piece of blue paper appears blue because the paper b. absorbs all colors of light except blue

The absorption of light makes an object dark or opaque to the wavelengths or colors of the incoming wave

When an object receives light, it absorbs some wavelengths and reflects others. The ones it reflects are the ones we see as color hence , correct answer will be  b. absorbs all colors of light except blue

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Answer:

The phenomenon that describes the emission of electrons from a metal surface when light shines on it is the Photoelectric effect.

The phenomenon that describes the emission of electrons from a metal surface when light shines on it is the Photoelectric effect.

Explanation:

The term photo is used to define light and so photoelectric effect defines the phenomena when the light falls on the metal and the resultant effect of electrons on the surface of the conductor. Photoelectric effect also known as photoemission.

When the light is made to be incident on the surface of a conductor, electrons are discharged or released from the metal. Here the energy of the light acts as a work function so that it is used for the energy that is required to emit electrons.

Answer:

d

Explanation:

i took that test

In the area 1, 2, and 3 on the image does the salinity of the ocean increase. Option D is correct.

Seawater is salty due to a variety of substances. The majority of them arrive via rivers, which bring chemicals dissolved from rock and soil. The most common is sodium chloride, also known as salt.

Salinity makes water colder and denser by lowering its temperature. The chilly water sinks to the ocean's depths. Slow currents carry it throughout the marine basins.

So the events that may occur when ocean salinity increases will be;

1)The mass of water increases.

2) Freezing point of water decreases.

3) buoyancy of objects in the water increases.

In the area 1, 2, and 3 on the image does the salinity of the ocean increase.

Hence, option D is correct.

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Answer:

0.8 J

Explanation:

According to the law of conservation of energy, all the elastic potential energy stored in the spring is converted into kinetic energy of the dart:

[tex]U=K[/tex]

where we have

[tex]U=\frac{1}{2}kx^2[/tex] is the elastic potential energy of the spring, where k is the spring constant and x is the compression/stretching of the spring

[tex]K=\frac{1}{2}mv^2[/tex] is the kinetic energy of the dart, where m is the mass and v is the speed

The elastic potential energy of the spring is equal to the work done in compressing it, so

U = 0.8 J

and according to the law of conservation of energy, the kinetic energy gained by the dart is exactly equal to the potential energy stored in the spring:

K =  U =0.8 J

Rearrange the equation so that the unknown variable is by itself on one side of the equals sign (=) and all the other variables are on the other side. RULE #1: you can add, subtract, multiply and divide by anything, as long as you do the same thing to both sides of the equals sign.

Answer:Tectonic Plates

Explanation:The ocean floor is part of the Earth's crust, which is made up of tectonic plates that all collide with eachother and form mountain ranges. Sometimes these ranges and valleys are under the ocean.

Answer:

Reactants are initiators of a chemical reaction whereas products are substances produced as the end of that reaction.

Explanation:

In a chemical reaction, there are two categories of substances involved: reactants and products.

The reactants are those substances utilized in a chemical reaction which undergo certain changes to produce different substances at the end of the reaction known as products.

On can write a chemical equation as:

M+N→MN, where M and N are the reactants and MN is the product.

For example,

     Zn + S → ZnS

      |___|         ↓

Reactants      Products

As you can notice when writing a chemical equation, reactants are always written on left hand side of the arrow and the products on the right hand side.

Answer:

D. Fulcrum

Explanation:

A wedge is a simple machine. A screw is a simple machine. A lever is a simple machine but fulcrum is the pivot point in a lever.

Answer:Another name for heat energy is... Infrared waves. These cannot be seen by your eyes but can be felt by your skin. ... Gamma Rays. ... Which type of electromagnetic radiation can result in sunburns and skin cancer? Ultraviolet Radiation ... X Rays. What is the distance between one point of a wave to the same point in the ...

Answer:

INFRARED

Explanation:

I TOOK THE TEST

~ K12 STUDENT

8TH GRADE

GOOD LUCKK!! :)

Answer:

a government sector

Explanation:

Among the given, the sector which ic not a part of the circular flow model of the economy is government sector. The flow includes the business sector, markets and households.

The circular flow model shows the movement of money in society. Money is sent back and forth between producers and employees in the form of wages and payments for goods. An economy is essentially an unending circle of money flow.

The model is constructed in this manner, but actual cash flows are more intricate. To more accurately represent the complex modern economies, economists have included extra variables.

Understanding the flow of money throughout an economy is the fundamental goal of the circular flow model. It divides the economy's major stakeholders into two groups: families and companies.

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Answer:

A Hypothesis, and a control variable.

Explanation:

Answer:

Fossil fuel resources sometimes referred to as "buried sunshine"? Because they make the Earth warm because they are found deep in the Earth and the energy stored in them was obtained from the sun long ago because they produce energy the same way the sun does all of the above.

Explanation:

Answer:

Explained

Explanation:

All plants or producers which there food by sunlight with help of a process called photosynthesis. These plants are eaten by consumers that is animals and plant eaters are eaten by animal eaters. In this process the energy is transmitted. Although the primary source of energy is sun. These plants and animals when dead are buried under the earth to form fossil fuels. This why fossils are sometimes referred as " buried sunshine"  

Answer:

a resource

Explanation:

people and animals drink it and it keeps use from being dehydrated.

A solid, a liquid, and a gas.

The propagation of light describes how light spreads out from a source and diminishes in intensity with distance, following the inverse square law. This concept is vital in fields like sample analysis and lithography. Understanding light propagation is essential for theoretical and practical physics and technology applications.

The propagation of light is an essential concept in physics with significant implications. When light travels from a source, such as a lightbulb, it expands in all directions, covering an ever-widening area. Because the total amount of light doesn't change, the amount of light in any given place decreases as the distance from the source increases, illustrating the inverse square law.

This weakening of light intensity has various practical applications:

Additionally, the wave-like nature of light is crucial in understanding interference and diffraction, as evidenced by the double-slit experiment. This experiment demonstrated that light behaves as a wave, creating observable interference patterns.

Overall, understanding how light propagates is vital for theoretical science and practical applications in technology and industry.

Matter: Toothpaste, Gasoline, Bacteria, Cell

Non-matter: Happiness, Sound.

Explanation:

The substances which occupies mass or volume occupying space is known as matter. It comprises of those things that can be seen through the eyes and it may include things like water, plants, food, dresses, etc. It can be defined by color or hardness.  

The substances that are made of energy without occupying space is known as non-matter substances. It can be classified as form of some energy. Some examples include light energy from torch, heat energy from fire and sound energy form whistle, etc.

Answer with explanations:

V=I1*R1=I2*R2 (when R1 and R2 are connected in parallel)

Therefore, rearranging above, I1/I2=R2/R1

Heat produced = I^2R

Ratio of heat produced by R1 and R2

= (I1^2*R1) / (I2^2*R2 )

= (I1/I2)^2 * (R1/R2)

= (R2/R1)^2 * (R1/R2)

= R2/R1

Ke=34J. The canoe's kinetic energy floating downriver at a speed of 2m/s and 17kg mass is 34J.

This is a problem of kinetic energy, which is a form of energy, known as motion energy. The kinetic energy of an object is that which is produced because of its movements that depends on its mass and velocity.

The kinetic energy is represented by the following formula: Ke = ½ mv². The kinetic energy is measured in Joules (J), the mass in kilograms (kg) and the speed in meters over seconds (m/s).

A small 17kg canoe is floating downriver at a speed of 2m/s. Let's calculate canoe's kinetic energy.

Ke= (17kg)[(2m/s)²]/2= 68/2 kg m²/s²=34J

.

Time = (distance) / (speed)

Time = (65 meters) / (0.23 m /s)

Time = (65 / 0.23) sec

Time = 282.6 seconds   ( that's 4 minutes 42.6 seconds)

The time it would take a turtle moving with a speed of 0.23 m/s to cover a distance of 65 meters is approximately 282.61 seconds.

The subject of this question is physics, specifically the concept of speed, distance, and time. The formula that relates these three quantities is speed = distance/time.

In this case, we are asked to calculate the time it would take for a turtle moving with a constant speed to cover a certain distance. Here, the given speed (0.23 m/s) of the turtle and the distance it needs to cover (65 meters) are known.

By rearranging the formula to solve for time, we get time = distance / speed. Plugging in the values, we get time = 65 meters / 0.23 m/s. Doing the math gives approximately 282.61 seconds. Thus, it would take the turtle around 283 seconds to cover the distance of 65 meters at a speed of 0.23 m/s.

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Answer:

7.5 km/h (2.1 m/s) due east

Explanation:

The average velocity of the person is given by:

[tex]v=\frac{d}{t}[/tex]

where

d is the displacement

t is the time taken

In this problem,

d = 15 km is the displacement

t = 2.0 h is the time elapsed

so the average velocity is

[tex]v=\frac{15 km}{2.0 h}=7.5 km/h[/tex]

and the direction is the same as the displacement (east).

We can also convert the velocity into SI units (m/s). We have:

d = 15 km = 15,000 m

t = 2.0 h * 3600 s/h = 7200 s

[tex]v=\frac{15,000 m}{7200 s}=2.1 m/s[/tex]

Answer: the answer is 7200s

Explanation: i just now it

Please brainliest

Explanation:

G is the universal constant of gravitation, approximately 6.67×10⁻¹¹ m³/kg/s².

g is the acceleration due to gravity.  It's defined by the universal law of gravity as:

g = MG / r²

where M is the mass of the planet and r is the distance from the planet's center to the object.

Near the surface of the Earth, g is approximately 9.8 m/s².

Answer:

B. zero

Explanation:

The total mechanical energy of a spring is equal to the sum of its kinetic energy, K, and its potential energy, U:

[tex]E=K+U[/tex]

Where

[tex]K=\frac{1}{2}mv^2[/tex] is the kinetic energy, where m is the mass and v is the speed

[tex]U=\frac{1}{2}kx^2[/tex] is the potential energy, with k being the spring constant and x the displacement

The total mechanical energy is conserved during the entire motion of the spring. We have two particular situations:

- At the equilibrium position, the displacement is zero: x=0, so U=0 and the kinetic energy is maximum.

- At the position of maximum displacement (so the leftmost or rightmost position), the displacement is maximum, so U is maximum while the speed is zero (v=0), and therefore the kinetic energy is also zero: K = 0.

Therefore, the correct answer is

B. zero

The mileage of the car how fast it is going

The speedometer in your car reads 55 mi/h. This represents the Instantaneous speed of the car.

Explanation:

Speed is a measurement of distance and time. Speedometers have been installed in vehicles to indicate the speed at which the driver drives the vehicles and control is also been used in few vehicles for the safety of the passengers like in school buses. When the car reads a reading in the speedometer, it denotes the instant speed of the car rather than the average speed.