A 25-kg child sits at the top of a 4-meter slide. After sliding down, the child is traveling at 5 m/s. How much PE does he start with? How much KE does he end with? How much energy is lost to friction?
Enter your answer in the space provided.

Answers

Answer 1
potential energy = mass× gravity × height (PE= mgh)
PE = 25 × 10 × 4 (am taking gravity to be 10 m/s^2....it could also be 9.81)
PE = 1000 J

Kinetic energy = (1÷2) mass × speed^2
EK = 0.5 × 25 ×5^2 
EK= 312.5 J

energy LOSS DUE TO FRICTION IS 1000 - 312.5 = 687.5J (If I made no error in calculations)

Related Questions

wat energy transformation occurs as the chicken cooks ?

Answers

Final answer:

The energy transformation that occurs as chicken cooks is a conversion of chemical energy from the heat source into thermal energy, which cooks the chicken. Not all of the energy converts to thermal energy for cooking, as some is lost to the environment.

Explanation:Energy Transformation in Cooking Chicken

As chicken cooks, there is an important transformation of energy that occurs. The heat from the stove is transferred to the pot and the chicken itself. This process is an example of thermal energy transfer. Specifically, chemical energy from the heat source (like gas or electricity) is converted into thermal energy, which is then absorbed by the chicken, causing the temperature of the chicken to rise and cook through.

In the kitchen, this conversion of energy type is critical in cooking all types of food, not just chicken. The energy transfer process ensures that the food changes from a raw state to a cooked state by the increased thermal energy breaking down proteins and killing bacteria, making the chicken safe to eat and more digestible.

It's important to note that during this energy transformation, not all energy is directly converted into thermal energy for cooking; some of it is lost to the environment. This demonstrates the concept of energy efficiency and that not all systems are 100% efficient.

Final answer:

The energy transformation happening as the chicken cooks is the conversion of electrical or chemical energy into thermal energy, which then cooks the chicken by denaturing its proteins.

Explanation:

The energy transformation that occurs as the chicken cooks involves converting electrical energy (if using an electric stove) or chemical energy (if using a gas stove) into thermal energy. This thermal energy is then transferred from the heat source to the chicken. As the heat is applied, the thermal energy cooks the chicken by breaking down its proteins and fats, causing a physical and chemical change in the chicken's structure. This transfer and transformation of energy are part of why the cooking process takes place.

To be more precise, when you turn on your stove, electrical energy or the chemical energy from natural gas is transformed into heat energy by the stove's heating element or burner. Then, as you place the chicken on the stove, energy is transferred as heat from the hot stove element to the cooler pot or pan, and eventually to the chicken itself. The heat cooks the chicken through processes such as denaturation of proteins, which alters the texture and flavor of the meat.

The escape velocity required for gas molecules to overcome the Earth’s gravity and go off to outer space is 1.12 x 103 m/s at 15oC. Calculate the molar mass of a species with that velocity. Would you expect to find He and H2 molecules in the Earth’s atmosphere? How about argon atoms?

Answers

Let us calculate the average energy of a molecule at such a temperature. The formula that gives it is E=3/2(kT) where k is the Boltzmann constant and T is the temperature in Kelvin. This formula holds for atoms, not substances with 2 or more atoms, but it is a good approximation (same order of magnitude) for other cases too. T=15+273=288K and k=1.38 × 10^(-23) J/K. Substituting, the energy is 3.97*10^(-21) Joules. The kinetic energy of an atom is also:
E=(1/2)mv*v where v is its speed and m is its mass. We know the speed, we are given to assume that it is the escape velocity and we have calculated E. Solving for m, we get:
[tex]m= \frac{2E}{v^2} [/tex]. Substituting we have that m=6.34*10^(-27) kg.
We now have to look up some mass values at a table. The most characteristic one is the mass of the hydrogen atom which is around 1.68*10^(-27) kg. We have thus that the mass of the hydrogen atom is lower than what we calculated. The mass of the He atom has around 4 times the mass, so it is around 6.7*10^(-27) kg. We thus have that the hydrogen atoms have a speed higher than the escape velocity due to their thermal motion (their mass is below the threshold that we calculated). A lot of helium atoms must be gone from the atmosphere too since the value of the mass is very close to the threshhold; if the temperature was 30C then helion could possibly leave the atmosphere. Finally, argon is much heavier than both these elements and hence its speed is going to be much smaller (mass is inversely proportional to the square of the speed when the temperature is constant). Hence, we expect a lot of the argon that was initially in the atmosphere to have stayed.


Which of the following occurs when an electron moves from a higher energy shell to a lower energy shell?

A. A neutron is always lost.
B. A proton is always gained.
C. Energy is released in the form of radiation.
D. The electron must be transferred to another atom.

Answers

The answer would be C: energy is released to form radiation.

Answer: Option (C) is the correct answer.

Explanation:

When energy is supplied to an electron then on absorption of energy it tends to move from a lower energy level to higher energy level.

And, when this electron moves from higher energy level to lower energy level then excess of energy absorbed by it is released in the form of visible light or radiation.

This emission of energy is also responsible for imparting color to a compound.

Thus, we can conclude that energy is released in the form of radiation occurs when an electron moves from a higher energy shell to a lower energy shell.

Which material is the most dense?

Answers

Osmium is the most densest substance 

Organisms can pass on genetic information through asexual or sexualreproduction.Which if the following statements best describes how asexual reproduction differs sexual reproduction

Answers

Final answer:

Asexual reproduction involves one parent and produces genetically identical offspring, while sexual reproduction involves the combination of genetic material from two parents to produce genetically varied offspring. Asexual reproduction allows many offspring to be produced quickly, whereas sexual reproduction provides genetic diversity, potentially increasing offspring survival rates in changing environments.

Explanation:

The main difference between asexual and sexual reproduction lies in the biological processes and resulting offspring. Asexual reproduction involves one parent and produces offspring that are genetically identical to that parent, while in sexual reproduction, genetic material from two parents combine to create offspring with genetic variation. Asexual reproduction methods include fission, budding, and fragmentation, making it possible for a single individual to quickly produce a large quantity of offspring that are ideally adapted to a stable environment.

In contrast, sexual reproduction creates a greater genetic diversity in offspring, providing them a higher chance of survival in changing or unpredictable environments. It typically includes processes such as internal or external fertilization of the female's eggs by the male's sperm. However, species that reproduce sexually need to maintain two types of individuals, males and females, which could be a disadvantage compared to asexual reproduction, especially when considered in terms of population growth and colonization of new habitats.

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PLEASE HELP ME
Tyler found his iguana playing with a soccer ball in the basement that contained 400kPa of pressure, held 3L and was at 300K. Devin took the ball in the garage where the pressure in the ball became 350kPa and the temperature was 250K. How much space did the ball take up? Question 14 options:
1. 2.9 L
2. 2.0 L
3. 2.8 L
4. 2.5 L
5. 2.7 L

Answers

Hello!

The ball took up 2,9L

To solve this problem, we should apply the ideal gas law and clear for n (the number of moles), as this value doesn't change when Devin takes the ball to the garage:

[tex]n= \frac{P1*V1}{RT1}=\frac{P2*V2}{RT2}[/tex]

Now, we should clear this equation to find V2, as this is the value we are looking for:

[tex]V2= \frac{P1*V1*T2}{P2*T1}= \frac{400kPa*3L*250K}{350kPa*300K}=2,857L[/tex]≈2,9L

Have a nice day!

Please I need help with questions 1-4 and it’s very hard and I’m struggling with it and can you check if I did the punnet square label good or not and if I didn’t do it good then help me fix it and read the directions carefully

Answers

the first one you did wrong on the side its GG not GgThe second one is wrong to on the side it its Tt not TTthe third one is wrong to on the side its tt, not TTthe last one is wrong to is wrong to the top is RR and the side is rr  P.S i did this 1 year ago  :PPPP
that the one  i did to 
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Who can use scientific inquiry and what does it involve?

Answers

anyone can use it it involves asking questions.observing and and inferrring experimenting and collecting datafinding evidence drawing conclusions 

Answer:

Sample Response: Scientific inquiry is the process used to ask and answer questions about the natural world. It can be used by anyone and involves asking a question, performing an investigation, collecting evidence, providing explanations, and communicating the results.

Explanation:

sample from Edge

If the bright lines in the spectrum of oxygen are matched by lines in the dark-line spectrum of the sun, what does that indicate? A. The gaseous outside of the sun contains oxygen. B. There is no oxygen in the sun. C. The sun burns its fuel using oxygen. D. The spectrum can be detected only by a radio telescope.

Answers

Answer:

the answer is A.

Explanation:

If the bright lines in the spectrum of oxygen are matched by lines in the dark-line spectrum of the sun, this indicate that the gaseous outside of the sun contains oxygen.

What is spectrum?

In physics, the term "spectrum" refers to the variation in light intensity with frequency or wavelength. A spectroscope is a device created for visual spectral observation, while a spectrograph is a device that captures or maps spectra.

Since all wavelengths are present, the spectrum of luminous solids is considered to be continuous. In contrast, the spectrum of burning gases is known as a line spectrum since it only emits a small number of wavelengths. If the bright lines in the spectrum of oxygen are matched by lines in the dark-line spectrum of the sun, this indicate that the gaseous outside of the sun contains oxygen.

Therefore, the correct option is option A.

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In swimming, you apply a force to the water to move yourself forward. The greater the water pressure, the faster you can swim. This can best be explained by one of newton's laws of motion that states A) for every force on an object that object exerts an equal and opposite force back. B) a body in motion will continue in motion unless acted upon by an outside force. C) the net force equals the mass times the acceleration of and object. D) energy cannot be created or destroyed on changed forms.

Answers

i believe the most reasonable answer is A.

In swimming, you apply a force to the water to move yourself forward. This can best be explained by one of newton's laws of motion that states for every force on an object that object exerts an equal and opposite force back. Thus option A is correct.

What is Newton's law of motion?

Newtons law of motion is three fundamental laws of classical mechanics that describe the relationship between an object's motion and the forces acting on it.

The three basic laws can be expressed as

Unless acted upon by a force, a body remains at rest or in motion at a constant speed in a straight line.When a body is acted upon by a force, its momentum's time rate of change equals the force.When two bodies exert forces on each other, the magnitude of the forces is the same but the directions are opposite.

Thus, in swimming, you apply a force to the water to move yourself forward. This can best be explained by one of newton's laws of motion that states for every force on an object that object exerts an equal and opposite force back. Thus option A is correct.

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helpppp me plzz....

Answers


2.a) warm air is lighter than cold air so thats why it's warmer upstairs than downstairs
3.d) Conduction is the process by which heat energy is transmitted through contact with neighboring molecules 
4.d) the lamp radiates heat throughout the plants 

HELP PLEASE What is chemical equation

A.substance present after a reaction
B.reaction in which substances combine to form a more complex compoud
C.principle that states that matter if not created of destroyed during a chemical rection
D. reaction in which one element replaces another in a compoud
E.substance present before a reaction
F.number telling how many molecules of a substance are involved in a chemical reaction
G.reaction in which compounds are broken down into simpler substances
H.uses symbols and formulas to show chemical reactions.

Answers

Chemical equation depict the number of molecules present in a substance in a chemical reaction.

Which statement correctly describes what happens when water turns to steam in terms of energy?
A. the water absorbs energy which causes chemical bonds to break, changing water to steam.
B. the water releases energy which causes chimical bonds to break, changing water to steam.
C. the water absorbs energy which causes the water molecules to have more kinetic and potential energy, changing their configuration from a liquid to a gas. D. the water absorbs energy which causes the water molecules to have less kinetic and potential energy, changing their configuration from a liquid to a gas.

Answers

the correct answer is c
The reasonable answer is C, because when water changes to steam you are heating the substance. Therefore it is absorbing heat of energy 

Will mark as Brainliest.


For the balanced equation shown below, how many moles of O2 will react with 0.3020 moles of CO2?
2C2 H5 OH + 6O2 → 4CO2 + 6H2O
Question options:

0.151 moles O2

0.201 moles O2

0.302 moles O2

0.453 moles O2

Answers

You always balance the equation first, which is done.
Set up a proportion: the answer comes out of the balanced equation.
6 mols O2:4 mols CO2:: x : 0.3020 mols CO2
6/4 = x / 0.3020 You could reduce this, but why bother. Calculators to the rescue.
Cross multiply
0.3020 *6 = 4*x
1.812 = 4x Divide by 4
1.812/4 = x
x = 0.4530 to 4 places.
D <<<< answer


You observe heat, light, and sound released by a chemical reaction. This reaction is (2 points)

absorbing energy
consuming energy
exothermic
endothermic

Answers

exothermic reaction.

There is an old story about a king and his crown. The king hired a goldsmith to make him a crown a pure gold. After the king received the crown, he started to worry that the goldsmith might have cheated him. He thought maybe the goldsmith didn't use pure gold, maybe he used a mix of metals to save money. The king asked a man named Archimedes to figure out if the crown was pure gold or not. Archimedes reasoned that the density of a lump of gold and a crown of pure gold would be the same. How could he prove if that crown was pure gold without melting or otherwise destroying the crown?

Answers

I've actually used the magnet test to determine if a gold necklace of mine was real or not. If the gold item aka the crown is attracted to a magnet, it is definitely not real gold.if it isn't then its real gold.
If gold does not attract to a magnet, then it is real gold. If it does then it is not real gold. Because magnets attract materials that are made of iron, but if it doesn't attract it is real because it does not contain any iron or nickel.

Which BEST explains why people see carrots as orange?
A) The carrots reflect only orange light.
B) The carrots absorb orange light from the Sun.
C) Orange light changes direction when it hits the carrots.
D) The carrots are opaque and do not allow orange light through.

Answers

the carrots reflect only orange light

Answer:

Option A

Explanation:

Carrots are composed by a large proportion of carotenoids. These are pigments that can absorb most of the light spectrum, peaking between 450-550nm, and falling at the yellow-orange range which is around 600nm and above. Therefore, the yellow-orange light that is not absorbed reflects towards our eyes.

A person who is interested in the brain and its functions might pursue a career in

A) endocrinology
B) gene therapy
C) neuroscience
D) sports medicine

Answers

C neuroscience is your answer.

Answer:

Explanat C nutro sience srry i f i  did not help

Number 10 plz :D tysm!!!

Answers

The answer is B because as plates made of oceanic crust pull apart, a crack in the ocean floor appears. Magma then oozes up from the mantle to fill in the space between the plates, forming a raised ridge called a mid-ocean ridge.

Hi!
Answer:
B) Two tectonic plates pullaway from each other, forming a rift valley or midocean ridge.
Hope this helps u! ;)
-Ari.

In what way is the planet Uranus unique

Answers

it is unique for many many ways: 
1.)Unlike the other planets of the solar system, Uranus is tilted so far that it essentially orbits the sun on its side, with the axis of its spin nearly pointing at the star. This unusual orientation might be due to a collision with a planet-size body, or several small bodies, soon after it was formed

Derrick just got home from playing soccer on a muddy field. He is curious how different brands of laundry detergent compare in removing mud from clothes, so he sets up an experiment. In one laundry load, he puts his muddy socks with Brand A detergent. In the next load, he puts his muddy jersey with Brand B detergent. In the final load, he puts his muddy shorts with Brand C detergent. Afterward, he noticed that the jersey came out the cleanest. He concludes that Brand B is the best detergent for removing mud from clothes. Is his conclusion valid? A. No; Derrick was biased toward Brand B. B. No; there were too many variables in the experiment. C. No; there were too many controls in the experiment. D. Yes; the experiment was set up correctly.

Answers

The answer to your question is NO; THERE WERE TOO MANY VARIABLES IN THE EXPERIMENT

PLEASE HELP ME!!!!!
The tires on Adrian's classic corvette tires are at 120kPa and 27L of air after going to California. Before he started, the tires had 20L of air. Choose the correct statement.

Question 6 options:

The original pressure must be more than 120kPa because when P increases, V decreases.


The original pressure must be less than 120kPa because when P increases, V decreases.


The original pressure must be more than 120kPa because when P increases, V increases.


The original pressure must be less than 120kPa because when P increases, V increases

Answers

the second one is correct im pretty sure

According to Boyle's law:

Pressure of given mass of ideal gas is inversely proportional to its volume at a constant temperature.

That can be represented as:

PV=Constant

Where P represents pressure, V represents volume.

Here as the volume increases that is from 20 L to 27 L, So pressure must decreases, so the original pressure must be greater than 120 kPa.

So the answer is "The original pressure must be more than 120kPa because when P increases, V decreases".

Which motion is the best model to use to illustrate passive transport?
Going over a hill
Going around a carousel
Going down a slide
Going through a tunnel

Answers

i assume with going down a slide since u urself are applying no force to move its just gravity

Answer: going down a slide.


Justification:


The term passive transport is used to the describe the movement of particles in circumsantaces that do not require the use of energy.


It is mainly used for some physical process related to particles like diffusion or osmosis.


For illustrative purposes. it is compared with the movment of an object down a hill (or a slide as in the case of this question) as the object will go from high to low without requiring the use of energy.


Can you please answer number 8 thanks

Answers

A day is added to February every four tears as a corrective measure. The Earth does not exactly revolve around the sun for 365 days. There is a small offset that is corrected by adding a day to February. This happens every four years and it is called Leap year.

Which are the products in this chemical reaction? 2C4H10 + 13O2 8CO2 + 10H2O

Answers

In the chemical reaction; 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O. The products of the reaction are; 8 molecules of carbon dioxide (CO₂), and 10 molecules of water (H₂O)

This chemical equation represents the combustion of butane (C₄H₁₀) with oxygen (O₂). Combustion is a type of chemical reaction where a substance reacts rapidly with oxygen, releasing energy in the form of heat and light. In the given equation, two molecules of butane (C₄H₁₀) react with 13 molecules of oxygen (O₂).

Breaking down the reaction:

On the left side (reactants):

2 molecules of butane (C₄H₁₀): C₄H₁₀ +C₄H₁₀

13 molecules of oxygen (O₂): 13O₂

On the right side (products):

8 molecules of carbon dioxide (CO₂): 8CO₂

10 molecules of water (H₂O): 10H₂O

The balanced chemical equation indicates that for every 2 molecules of butane reacting, it requires 13 molecules of oxygen. After the reaction, 8 molecules of carbon dioxide and 10 molecules of water are produced as products.

This balanced equation demonstrates the conservation of mass. The total number of atoms of each element on the left side of the arrow (reactants) is equal to the total number of atoms of each element on the right side of the arrow (products). This is a fundamental principle in chemical reactions, ensuring that matter is neither created nor destroyed, only rearranged to form new substances.

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How can we find the volume of this fish tank? Please I needed but Good

Answers

Answer:

The correct answer is find the number of 1 foot cubes that fill the fish tanks.

Explanation:

Volume is defined as amount of space occupied by an object.

Number of 1 foot cubes lying on the length of fish tank ,l= 5 feet

Number of 1 foot cubes lying on the width of fish tank,w = 3 feet

Number of 1 foot cubes lying on the height of fish tank ,h= 3 feet

Volume of the cuboid fish tank will be :

The volume of fish tanks id 45 cubic feet.

Explanation:

To find the fish tank's volume, multiply its length, width, and height, represented by: Volume = Length × Width × Height, which is 5 multiplied by 3 multiplied by 3, which yields 45 cubic feet.

To determine the volume of the fish tank, envision it as a rectangular prism and determine the dimensions based on the arrangement of 1-foot cubes. The length, width, and height are given as 5 cubes, 3 cubes, and 3 cubes, respectively. By multiplying these dimensions, you calculate the total volume of the tank.

Each dimension represents the number of cubes stacked along that axis, illustrating how they fill the three-dimensional space. This multiplication reflects the total number of cubic feet the tank can contain. Once multiplied, the result represents the volume of the fish tank, providing insight into its capacity in cubic feet.

Can you please answer 12 and 13 thanks

Answers

12. When the sun is farthest north or south of the equator, the even is called solstice. When it is farthest to the north, it is called summer solstice and when it farthest to the south it is called winter solstice .

13. When neither hemisphere is tilted toward nor away form the sun, it is called equinox. At this time, daylight and night time is as long as each other, or they are both 12 hours long in both hemisphere. 

How much heat is lost when 350g of iron cools from 54.1 to 22.4oC? (The specific heat of iron is 0.450 J/g oC)

Answers

Heat lost = mcΔT, where m is the mass of iron , c is the specific heat capacity of iron, and ΔT is the change in temperature.
Mass of iron = 350 g, specific heat capacity = 0.450 J/gC while;
change in temperature = 54.1 - 22.4 = 31.7 
Hence; heat = 350 × 0.450 × 31.7
                    = 4992.75 J or 4.993 kJ

what characteristic of carbon atoms helps to explain the wide variety of organic compounds ???

Answers

The characteristic is that carbon atoms can form up to 4 single covalent bonds.
Carbon atoms have 4 valence electrons, so they can gain or lose 4 electrons, or even bond with 4 more atoms

is H2CO3 and Na2CO3 a buffer

Answers

Yes it is a buffer because it is a combination of weak acid and it’s conjugate salt

Answer:

No

Explanation:

A buffer solution is a combination of a weak acid and its conjugate base; for instance, carbonic acid (H2CO3) and sodium bicarbonate (NaHCO3), not sodium carbonate (Na2CO3). Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications.

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