Answer:
45
Explanation:
well 45
Mechanical advantage will be option b)1.25
What is Mechanical advantage ?
Mechanical advantage equal to the ratio of length of the input arm and output arm
Given
Input arm = 50 cm
output arm = 40 cm
Mechanical advantage = Input distance / Output distance
= 50 / 40
= 1.25
Mechanical advantage will be option b)1.25
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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
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.
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.
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?
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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Use the chemical reaction to answer the question.
Answer:
I believe this answer is -They maintain their properties-
Explanation:
Let's see what others say. :)
HELP EXPERT I NEED HELP
Place the following events in sequence: A) Voltage is increased by a transformer; B) Voltage is decreased by a transformer; C) Electrical current enters your home
What is most likely to occur during a chemical reaction
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.
The distance versus time graph for Object A and Object B are shown. (3 points)
Which object moves with changing speed?
Only Object B, because the graph has straight lines
Only Object A, because the graph starts from the origin
Both Object A and Object B, because the slope of the graph is the same throughout
Both Object A and Object B, because different distances are traveled in the same time interval
Answer:
hold on im going to answer the best I can
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
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.
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Two laws are described below:
Law A: It can be broken under certain conditions.
Law B: It does not focus on a natural phenomenon.
Based on these characteristics, what can you conclude about Law A and Law B?
Both Law A and Law B are societal laws.
Both Law A and Law B are scientific laws.
Law A is a scientific law and Law B is a societal law.
Law A is a societal law and Law B is a scientific law.
Answer:
B is the answer. Law A is a scientific law and Law B is a societal law
Answer: Both law A and B are scientific laws
( 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?
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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Hyperopia occurs because the eyeball is too ____________, causing images to be focused behind the retina.
PLEASE HURRY! WILL GIVE BRAINLIEST!
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:
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.
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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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.
Answer:
The answer is D
Explanation:
I took the quiz:)
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.
I CAN MARK SOMEONE BRAINLIEST!!! Which of the following statements best describes the location of −(−6) on a number line?
It is 6 units to the left of 0.
It is 6 units to the right 6.
It is 6 units to the right of 0.
It is 6 units to the left of 6.
6 units to the right
Answer: GIRL/BOY HELLO AND STOP DELITING MY ANSWER ITS 6 UNITS TO THE LEFT OF 0
Explanation:
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.
What are some of the landforms rovers have found on Mars that show it was once an active place?
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:
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)
Answer:
it is 21
Explanation:
Venn diagrams are used for comparing and contrasting different topics. The overlapping sections show characteristics that the topics have in common, and the sections that are unique to each topic show the characteristics apply to only that topic.
Overlapping circles are labeled solid on top, liquid at right, gas at left, with the intersection of all three labeled state of matter.
Which Venn diagram accurately describes what characteristics of solids, liquids, and gasses could be added to this diagram?
Overlapping circles are labeled definite shape most dense at top, mid-level density at right, definite volume least dense at left, with the intersection labeled state of matter.
Overlapping circles are labeled definite shape most dense at top, mid-level density at right, least dense at left, with the intersection of all three labeled state of matter. The intersection of the top and right circles is labeled definite volume.
Overlapping circles are labeled definite shape most dense at top, definite volume mid-level density at right, least dense at left, with the intersection of all three labeled state of matter. The intersection of the left and right circles is labeled definite shape.
Overlapping circles are labeled definite shape least dense at top, definite mid-level density at right, most dense at left, with the intersection of all three labeled state of matter. The intersection of the left and right circles is labeled definite shape.
Answer:
its the third image
Explanation:
Answer:
3
Explanation:
Can someone help me please? thanks
Answer:
C or 3rd option
Explanation
True or False this is a black hole 75 points + Brainliests
Answer:
true
Explanation:
lol idek tbh
Answer: true?
thx for the points anyway
Explanation:
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!)
A transformer has 500 loops in its primary coil and 5,000 loops in its secondary coil. What is the voltage in the primary coil if the voltage in the secondary coil is 20,000 v?
Answer:
2000v
Explanation:
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.
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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)
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.
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.
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 happens if you decrease the kinetic energy of the substance? What would happen if you increased the kinetic energy of a substance?
Answer:
decrease will go slow and increasing will make it go faster
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Out of the wild west during the time of colonial expansion , the native peoples would put their ears to the ground to listen for herds of bison or groups of horses in the area. Why would listening to the ground be more effective than cupping a hand around your ear while standing up on high ground?
A.the ground is denser than the air so the sound of a herd can be heard sooner through ground than through the air.
B.the ground is less dense than the air so the sound of a herd can be heard sooner through the ground than through air.
C.the ground is denser than the air so the sound of a herd can be heard through air than through ground.
D.the ground is less dense than the air so the sound of a herd can be heard sooner through the air than through the ground.
(please be 100% sure with your answer)
Answer:
The answer is 100% A THE ANSWER IS A!!!!
Explanation:
i have a 100 in all of my classes including science
Listening to the ground is more effective than cupping a hand around your ear while standing up on the high ground because the ground is denser than the air so the sound of a herd can be heard sooner through the ground than through the air.
What is a sound wave?It is a particular variety of mechanical waves made up of the disruption brought on by the movements of the energy. In an elastic medium like the air, a sound wave travels through compression and rarefaction.
As given in the problem statement the native peoples would put their ears to the ground to listen for herds of bison or groups of horses in the area.
The speed of the sound depends on the medium of the travel it is maximum in the solid and minimum among all the three mediums.
Because the earth is denser than the air and the sound of a herd travels more quickly through the ground than through the air, listening to the ground is more effective than placing your palm over your ear while standing at a high point.
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