1) If you release a rubber band that had 10 units of elastic energy, 12 units of movement energy cannot be produced. Why not?
2) For the rubber band in question 3, what would its percentage efficiency be if 7 units of movement energy were produced? Where have the remaining 3 units of energy gone?
3) What are the by-product energy transformations for a car?
Answers
Answer:
press dat crown for meh
Explanation:
A system's internal energy is given by the heat added to the system less the work done by the system
1) 12 units of movement energy cannot by produced from 10 units of elastic energy because the additional 2 units of energy cannot be created in the closed system of the rubber band
2) Part A; The percentage efficiency = 70%
Part B; The remaining 3 units is transformed into heat and sound energy
3) The by-products of the energy transformation for a car are;
Heat energySound energyChemical energyThe reason for the above outcomes is as follows:
1) The first law of thermodynamics known as the law of conservation of energy states that the sum of energy within an closed or isolated system is constant and it is conserved as time progresses
Mathematically, the law can be expressed as follows;
K₁ + U₁ = K₂ + U₂
Where;
K₁ and U₁ = Initial kinetic and potential energy respectively
K₂ and U₂ = Final kinetic and potential energy respectively
The energy stored in the rubber band is given as 10 units of elastic energy. If the rubber band is taken as being in a closed system, then no additional energy is added, and we have;
U₁ = 10 units and K₁ = 0, which gives;
K₁ + U₁ = 10 units
According to the law of conservation of energy, we get;
10 units = K₁ + U₁ = K₂ + U₂
Therefore, the sum of the final kinetic and potential energy is 10 units and the energy can only be transferred from kinetic to potential (internal) energy, such that the maximum kinetic, movement, energy obtainable is 10 units and 12 units of movement energy cannot be produced
2) The given parameter:
Initial amount of elastic energy = 10 units
The amount of movement energy produced = 7 units
[tex]Efficiency = \mathbf{\dfrac{Useful \ energy \ produced}{Total \ energy \ stored} \times 100}[/tex]
[tex]\mathbf{Efficiency \ of \ the \ rubber \ band, \, \eta }= \dfrac{Movement \ energy \ produced}{Elastic \ energy \ stored} \times 100[/tex]
Therefore;
[tex]\mathbf{\eta = \dfrac{7}{10} \times 100} = 70 \%[/tex]
The percentage efficiency of the rubber band, η = 70%
Part B
The remaining 3 units of energy is transformed into other energy forms including heat and sound energy
3) A by-product is a secondary product, produced in addition to a main or primary product.
In the energy transformations of a car, the main product of the energy transformation is the movement energy of the car
The by-product of the energy transformation in a car includes;
Heat energy; The temperature of the engine of the car rises
Sound energy; The engine sound
Chemical energy; The formation of new chemicals during the combustion process
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Related Questions
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Janice has just measured the density of an object. Which value is possible? (Density: D = )
A.–1 g/cm3
B.4 m/s
C.–3 m/s
D.6 g/cm3
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The blue mass in the image is 10kg.
The red mass in the image is 10kg.
The blue mass is currently 4 meters away from the red mass.
If we change each mass to 20kg, what will happen to the gravitational force each mass puts on the other?? You have to pick a answer through A,B,C! The force of gravity will increase as the masses increase.
The force of gravity will not change as the masses increase.
The force of gravity will decrease as the masses increase.
Answers
IF YOU GET GOOD GRADES ON SCIENCE TESTS PLEASE HELP ME!!!!!
The student develop the model above ( its really below) . usually the model, identify two potential wave phenomena that occur and are the reason behind why the student can only hear the train in front of the apartment complex.
A. the train can be heard more easily in front of the apartment complex because of reflection and interference. as the sound comes from train, the sound waves reflect off of the complex and interfere with each other increasing amplitude of the wave to make it easier.
B.the train can not be heard ad easily in the park because of reflection and diffraction. the sound reflects off of the trees in the park and diffract between the tree, this causes the waves to bend too much to be heard.
C.the train can be heard more easily in front of the apartment complex because of diffraction and refraction. the sound waves diffract between the other buildings aiming them towards the apartment complex and then the sound refracts through the apartment complex which makes it more difficult to hear in the park.
D.the train can not be heard as easily in the park because of interference and reflection. the other buildings in front of the park cause interference of the sound waves from the train and the trees in the park cause reflection making it too hard to hear the train.
(please be 100% sure about your answer)
Answers
Answer:
A i think hope this helps
Explanation:
Answer:
A
Explanation:
The sound wave hits the apartment complex first.
im sure this is physics and not science
Use the chemical reaction to answer the question.
Answers
Answer:
60 grams
Explanation:
Follow these steps to compare pieces of sticky tape that have the same charge:
Tear off two pieces of clear sticky tape that are about 15 cm (6 inches) long. Stick the two pieces of tape side by side on the tabletop.
Tear off two more pieces of tape, and fold under a half inch of each piece as shown in the side view. This tab makes them easy to pull off later on. Stick these pieces of tape onto the pieces already on the table and smooth them down.
tape folded to create a tab
Using both hands, grab the tabs of the two top pieces of tape. Carefully pull both top pieces of tape off the bottom pieces. Turn the non-sticky sides of the tape toward each other.
What do you observe? If there’s an interaction, explain whether the tape pieces attract or repel each other.
Answers
Answer:
they would atrract because they are sticky but when you take it off it would ware off
Explanation: I have used tape before and when you stick something to it then take it off it wares off
Two pieces of sticky tape with the same charge are formed when the non-sticky sides of the tape remain facing each other, it is observed that there is an interaction between the two pieces of tape, but the attraction and repulsion depend upon their charges.
What is the significance of attraction and repulsion?If the two pieces of tape have the same charge, they will repel each other, and as a result, the pieces of tape will move away from each other and if the two pieces of tape have opposite charges, they will attract each other, and as a result, the pieces of tape will move towards each other. The electric fields that are created by each piece of tape attract each other if they have differing in charges.
Hence, interaction between the two pieces of nonstick tape is observed, and the attraction and repulsion depend upon their charges.
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What are some of the landforms rovers have found on Mars that show it was once an active place?
Answers
Answer:
The Curiosity rover found that ancient Mars had the right chemistry to support living microbes. Curiosity found sulfur, nitrogen, oxygen, phosphorus and carbon-- key ingredients necessary for life--in the powder sample drilled from the "Sheepbed" mudstone in Yellowknife Bay.
Explanation:
Hope it helped
Answer:
,
Explanation:
Can someone help me please? thanks
Answers
Answer:
C or 3rd option
Explanation
PLEASE HELP IF U PASS TESTS
if the same amount of heat is added to 25.0g samples of each of the metals in the chart, which metal will experience the largest temperature change?
a. calcium
b. iron
c.silver
d.gold
Answers
Gold metal will experience the largest temperature change.
Explanation:
Given:
Four different metals of 25.0 gram in which the same amount of heat was added.
To find:
Which metal will experience the largest temperature change.
Solution
Consider heat added to all metals be Q and the mass of every metal is 25 grams. This means the value of temperature change will be dependent on value specific heat of metals.
The change in temperature of the substance when heat is supplied to the substance is given by:
[tex]Q=m\times c\times \Delta T\\\Delta T=\frac{Q}{mc}\\\Delta T\propto \frac{1}{c}....[1][/tex]
The above relation means that change in temperature is inversely proportional to the specific heat of the metal.
The specific heat of calcium =[tex]c_{Ca}=0.647 J/g^oC[/tex]
The specific heat of iron = [tex]c_{Fe}=0.449 J/g^oC[/tex]
The specific heat of silver = [tex]c_{Ag}=0.235 J/g^oC[/tex]
The specific heat of gold =[tex]c_{Au}=0.129 J/g^oC[/tex]
[tex]c_{Au}<c_{Ag}<c_{Fe}<c_{Ca}[/tex]
So, out of these metals, gold has the lowest value of specific heat and according to relation (1), the temperature change will be largest in 25.0 grams of gold and will be least in calcium.
The order of change in temperature of the metals will be:
[tex]\Delta T_{Au}>\Delta T_{Ag}>\Delta T_{Fe}>\Delta T_{Ca}[/tex]
Gold metal will experience the largest temperature change.
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Can someone help me
Which of the following would a good frame of reference?
A) the moon
B) a tree
C) a rabbit
D) your sister while she rides her bike
Answers
How does the agricultural activity most likely affect the surface water of the area?
Answers
Answer:
Agriculture has been the cause of significant modification of landscapes throughout the world. Tillage of land changes the infiltration and runoff characteristics of the land surface, which affects recharge to ground water, delivery of water and sediment to surface-water bodies, and evapotranspiration.
Explanation:
PLEASE HELP!!!!! Thalia is drafting a plan to move a large, perfect sphere concrete sculpture that is in front of her office building. Describe the considerations Thalia would need to make if she was drafting a plan to move the sculpture.
Answers
Answer:she should consider the time on how long it would take to move it and where she will move it
Explanation:
hope this helps
what are the independent and dependant variables in Plate Tectonics Lab Report?
Answers
Answer:
Independent= amount of years.
Dependent= geologic events
Explanation:
What is most likely to occur during a chemical reaction
Answers
Answer/Explanation:
In a chemical reaction, the atoms and molecules produced by the reaction are called products. ... No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
This question involves the concepts of a chemical reaction, conservation of mass, chemical bonds.
During a chemical reaction, the phenomenon that is most likely to occur from the given phenomena is "Mass is conserved".
Whenever a chemical reaction occurs old bonds between the elements are broken and new bonds are formed amongst different elements. Hence, the properties of the original substances are changed due to the formation of new bonds, and new molecules as a result.
Original molecules or substances are lost due to formation of the new ones.
No new atoms are created or destroyed in a chemical reaction. The atoms just rearrange themselves to form new molecules or substances only.
Since no atoms are created or destroyed during a chemical reaction. Hence the law of conservation of mass is applicable to a chemical reaction. This means the mass is conserved during a chemical reaction.
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The attached picture shows different types of chemical reactions.
HELP EXPERT I NEED HELP
Answers
Which contributions did Johannes Kepler make? Check all that apply.
Which contributions did Johannes Kepler make? Check all that apply.
He revived Aristotle’s model of the solar system.
He solved Ptolemy’s model by proving elliptical orbits.
He proved Galileo’s calculations were incorrect.
He determined that planets move faster when closer to the Sun.
He discovered laws of planetary motion.
Answers
Answer:
he solved ptolemy's model of the solar system
he determined that planets move faster when closer to the sun
he discovered laws of planetary motion
Explanation:
•✧•
John Kepler made significant contributions to optics and geometries. Options 2,4 and 5 are the statement that shows the contribution of Johannes Kepler.
What are the contributions of Johannes Kepler?Johannes Kepler was indeed an astronomer and mathematician who finds the planet's elliptical orbits around the sun.
He identifies three basic rules of planetary motion. He also made significant contributions to optics and geometries.
Following are the contributions of Johannes Kepler;
2. He solved Ptolemy’s model by proving elliptical orbits.
4. He determined that planets move faster when closer to the Sun.
5. He discovered the laws of planetary motion.
Hence options 2,4 and 5 are the statement that shows the contribution of Johannes Kepler.
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( please just tell me the formula to use to solve it ) A hockey puck has a coefficient of kinetic friction of μk = .10. If the puck feels a normal force (FN) of 5 N, what is the frictional force that acts on the puck?
Answers
The frictional force that acts on the puck is 0.5 N.
The given parameters;
coefficient of kinetic friction, μk = 0.1normal force of the puck, Fₙ = 5 NThe frictional force that acts on the puck is determined by taking the product of the normal force and the coefficient of kinetic friction.
The frictional force that acts on the puck is calculated as follows;
[tex]F_k = \mu_k F_n[/tex]
Substitute the given parameters in the above equation and solve the frictional force.
[tex]F_k = 0.1 \times 5\\\\F_k = 0.5 \ N[/tex]
Thus, the frictional force that acts on the puck is 0.5 N.
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Where in the eye are rods and cones located?
cornea
retina
lens
iris
WILL GIVE BRAINLIEST!
Answers
Answer:
By the Retina
Explanation:
I like your profile pic
Answer: retina
Explanation: They are located in the retina (a layer at the back of the eye).
A group of students is investigating whether the smoothness of a surface affects the force of friction. Each student pushes a book on two different surfaces. One surface is ice and the other is concrete. The distance traveled by the book on each surface is shown.
Experimental Observations
Student 1 Student 2 Student 3 Student 4
Distance traveled by book on ice 23 cm 21 cm 24 cm 22 cm
Distance traveled by book on concrete 15 cm 18 cm 16 cm 17 cm
Based on the table, which conclusion is correct about the average distance traveled?
A. It is less on concrete.
B.It is greater on concrete.
C.It is less when the book is pushed harder.
D. It is independent of the type of surface.
Answers
Answer:
The answer is D
Explanation:
I took the quiz:)
PLEASE HELP! 20 POINTS!
Amy and Chris took different routes to travel from Point A to Point E. Amy took the route along A, B, C, D, and E and reached the destination in 2 hours. Chris took the route along A, G, F, and E and reached the destination in 3 hours. Their routes are shown.
Which conclusion is correct?
Amy's average speed is twice Chris's average speed.
Chris's average speed is twice Amy's average speed.
Amy's average speed is equal to Chris's average speed.
Chris's average speed is three times Amy's average speed.
Answers
Answer:
Amy's average speed is equal to Chris's average speed
Answer:
im pretty sure its 'a'
Explanation:
Amy took 1 more point than Chris and reached their destination in 2 Hrs. when Chris took less and reached the destination in 3 Hrs.
see picture for visual explanation:
HaLp PlEsSsS
Write a paragraph of five sentences or more explaining how the radio uses the behavior and characteristics of the radio wave to function.
You must include citations for all reliable sources used. Include citations from three or more reliable sources.
Answers
Answer:
hey! answer below:
Paragraph:
The radio uses the behavior and characteristics of the radio wave to function because there is... I don't have the time to write a paragraph of five sentences or more explaining how the radio uses the behavior and characteristics of the radio wave to function. I am supposed to be doing math but instead, I am doing this. Please don't get mad! I have a 97 in ELA and a 104 in engineering, I hope you care. I just wanna get these points bro.
Q3. A bridge is built without expansion gaps.
Explain what could happen to the bridge if the temperature became:
a) much hotter than the day it was built.
b) much colder than the day it was built.
Explain it please
Answers
B) The bridge will contract since metal contract when in cool temperatures
A bridge is built without expansion gaps will expand if the temperature became much hotter than the day it was built.
A bridge is built without expansion gaps will contract if the temperature became much colder than the day it was built.
What is thermal expansion?The expansion of any material due to the variation of the temperature is known as thermal expansion. It varied differently for different materials according to their corresponding values of the coefficient of the thermal expansion.
A bridge is built without expansion gaps will expand if the temperature became much hotter than the day it was built and it will contract if the temperature became much colder than the day it was built.
Learn more about Thermal expansion
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If you push a book against a wall hard enough, it will not slide down even though gravity is pulling it. Use what you know about Newton’s laws of motion to explain why the book is not falling. (giving away brainliest!)
Answers
f = coefficient of friction (u) X Normal reaction exerted by the surface (N)
So, f = u X N.
Now 'u' is a constant for given surfaces in contact ( keep in mind that it depends on both the surfaces that are in contact with each other, here wall and the book that you are pressing)
Now, Normal reaction is equal and opposite to the force exerted by an external force on the surface, PERPENDICUAL TO THE SURFACE ( or the perpendicular component of the external force). The external force exerted on the surface which is vertical to it, in this case, is equal to the force that you are applying while you are holding/pressing the book against the wall.
So, at any point of time, frictional force = u X (Force you are applying on the surface, via the book)
Or, f = u X F, where,
f = frictional force,
u = coefficient of friction, and
F = Perpendicular component of the force exerted by you on the book towards the surface.
Now direction of f -
Frictional force always act parallel to the surface and in opposite direction to the direction of motion.
In absence of friction, book will fall down, because of gravity acting on it. So friction will try to act in the opposite direction of this motion. So, upwards in this case.
If let's say you have a metal object placed between magnets, which is applying more force on it than gravity, in upwards direction; and you try to press it against the wall, the motion of object will be upwards, so friction will then act downwards.
Friction always opposes the direction of motion in which the object would have moved because of RESULTANT FORCE on it in absence of friction.
Takeaways in English (or, common observation) -
1) Harder you press the book against the wall, harder it will be for a person to move the book on the surface of the wall, while you are pressing it. Because of higher friction.
2) The more you move the book on the wall, while keep on pressing it, warmer the surface of the book which is in contact with wall will be. Because if more energy is dissipated per second to overcome friction, which gets converted to heat energy.
2.1) Harder you press, book will heat up faster.
3) Harder you press the book against the wall, lesser chance are that it will fall down. Because more frictional force is now acting on it to hold it against gravity.
4) Heavier the book, more frictional force is needed to hold it from falling, and that is why you have to press it harder to hold Heavier books.
5) That is all I can think of right now. Try applying this concept in things you see around.
12.8K viewsView 6 Upvoters · Answer requested by Muhammad Shouman
Related Questions (More Answers Below)
Rahul sees a flock of birds. He watches as the flying birds land in neat little rows on several power lines. Which change of state does the motion of the birds most closely model?
melting
vaporization
deposition
sublimation
Answers
Answer:
C.) Deposition.
Explanation:
I just took the unit test
The change of state that Rahul sees and models the motion (movement) of the birds is called deposition.
What is deposition?In physics, deposition can be defined as a transition phase from a gaseous state to a solid without the need to pass to a liquid state.
The physical phenomena of deposition are relatively common in nature and they include many natural processes.In conclusion, the change of state that Rahul sees and models the motion (movement) of the birds is called deposition.
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Hyperopia occurs because the eyeball is too ____________, causing images to be focused behind the retina.
PLEASE HURRY! WILL GIVE BRAINLIEST!
Answers
Answer:
Hyperopia occurs when the image formed by the focusing mechanism of the eye is “behind” the retina. This often occurs if an eye is shorter than average.
Explanation:
Hyperopia happens when a persons eye is smaller than others, when this happens a person would likely need glasses
Answer:
short
Explanation:
The downward force of gravity and the upward force of air resistance on a ball are both 5N. What is the ball's acceleration?
Group of answer choices
-5 m/s
5 m/s
10 m/s
0
Answers
Answer:
0
Explanation:
I believe they both cancel each other out, I might be wrong though
HELP FAST CORRECT ANSWERS ONLY
Why is the dust tail of the comet curved instead of straight?
A.
the ions move at a much slower speed than ions of the ion tail.
B.
The ions move at a much faster speed than ions of the ion tail.
C.
The gravitational pull of Jupiter causes the curve.
D.
The gravitational pull of Earth causes the curve.
Answers
If engine A has more power than engine B, what does one know for sure?
Engine A is able to move a car further.
Engine B can do more work in less time.
Engine A is able to accelerate a car faster.
Engine B gets better gas mileage.
Answers
Answer:
This has a better power than engine B , you will find this engine better for in gear acceleration and overtaking manuevers also this engine will allow a higher top speed.
Explanation:
