Efficiency or [tex]\eta[/tex] is calculated by formula: [tex]\eta=\frac{W_{output}}{W_{input}}[/tex] where [tex]\eta\leq1[/tex] also efficiency has no unit.
Now put in the data and calculate the efficiency.
[tex]\eta=\frac{8}{10}=\boxed{0.8}[/tex]
The efficiency of the machine is 0.8
If you want to get percentage just multiply by 100 and you get 80%
Hope this helps.
r3t40
What is the magnetic force acting on an electron if its speed is 3.0 × 106 meters/second and the direction is perpendicular to a magnetic field of 0.020 teslas? The value of q = -1.6 × 10-19 coulombs.
A. F = 0 newtons
B. F = -6.0 × 10-15 newtons
C. F = -9.6 × 10-15 newtons
D. F = -3.0 × 10-16 newtons
E. F = -3.2 × 10-21 newtons
Answer:
[tex]9.6\cdot 10^{-15} N[/tex]
Explanation:
The magnetic force acting on a charged particle moving perpendicularly to the field is given by:
[tex]F=qvB[/tex]
where
q is the charge
v is the speed of the particle
B is the magnetic field strength
In this problem, we have:
[tex]q=-1.6\cdot 10^{-19} C[/tex] is the charge
[tex]v=3.0\cdot 10^6 m/s[/tex] is the speed
[tex]B=0.020 T[/tex]
so, the magnetic force is
[tex]F=(-1.6\cdot 10^{-19} C)(3.0\cdot 10^6 m/s)(0.020 T)=9.6\cdot 10^{-15} N[/tex]
Answer:
For plato users: Option C.
Explanation:
Please help me
The pitch of a sound is determined by its wavelength and speed together, or its ______ alone.
Answer:
Speed
Explanation:
Answer:
frequency
Explanation:
Solutions with ions that react with acids or bases to lessen their effects are fubrefs
Answer:
Buffers
Explanation:
A buffer solution is a solution containing weak acids and their salts or weak bases and their salts.
A buffer solution is an equilibrium system that resists changes in pH or pOH when a small amount of an acid or base is added hence it is a solution of fairly constant pH value.
Aaron created the chart to list the benefits and limitations of using synthetic polymers . In which row has Aaron made an error in his chart?
Answer:
Its B trust me
Aaron created the chart to list the benefits and limitations of using synthetic polymers . In row 2 Aaron made an error in his chart.
What is meant by Synthetic polymers?Synthetic polymers are derived from petroleum oil, and made by scientists and engineers. Examples of synthetic polymers include nylon, polyethylene, polyester, Teflon, and epoxy. Natural polymers occur in nature and can be extracted. They are often water-based.Aaron created the chart to list the benefits and limitations of using synthetic polymers . In row 2 Aaron made an error in his chart.
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HELP ASAP!!!!!! a piano tuner is tuning a string which should have a frequency of 440 hz. she knows the pitch is too high and she hears 4 beats per second. what is the frequency of the piano string?
Answer:
444 Hz
Explanation:
When two notes of slightly different frequency interfere with each other, they form a resultant wave whose frequency is called beat frequency, which is given by the difference between the frequencies of the two notes:
[tex]f_B = |f_1 - f_2|[/tex]
In this case, we have
[tex]f_1 = 440 Hz[/tex] is the frequency of the tuner
[tex]f_2[/tex] is the frequency of the string
[tex]f_B = 4 Hz[/tex] is the beat frequency (4 beats per second)
We also know that the frequency of the string is too high compared to the tuner, so
[tex]f_2 > f_1[/tex]
so we can find the frequency of the string:
[tex]f_2 = f_1 + f_B = 440 Hz + 4 Hz = 444 Hz[/tex]
Why does Earth orbit the Sun rather than any other body in the solar system? A) The mutual repulsions among all the planets hold Earth in its orbit. B) The Earth is closer to the Sun than other bodies in the solar system. C) The Sun is the most massive object; gravitational attraction is related to mass. Eliminate D) The rotational motions of all the planets, including Earth, cause them to remain in its orbit around the Sun.
Answer:
C
Explanation:
cause im smart
Answer: C
Explanation:
Not only am I smart but I want to help people.
In any energy transformation, energy is _____.
Answer:
In any energy transformation, energy is the change of energy from one form to another.
In any energy transformation, energy is Conduction.
The conversion of one form of energy into every other, or the motion of electricity from one location to every other. A strength transformation is the change of strength from one shape to any other. The cloth that doesn't conduct warmness, electricity, light, or sound. electricity or pressure an object has because of its motion.
Conduction is the system via which warmness electricity is transmitted through collisions between neighboring atoms or molecules. Conduction occurs more with ease in solids and drinks, in which the particles are closer collectively than in gases, in which debris are similarly apart.
While electricity is transferred from one part of a machine to every other?Conduction is the switch of power from one molecule to another by direct contact. This switch happens when molecules hit each differently, much like a game of pool where one moving ball strikes the other, causing the second to move.
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the slope of a speed time linear graph is
It give s you acceleration as slope of v-t graph gives acceleration
The slope of speed time linear graph is acceleration of an object.
Explanation:
By formula, the product of mass and acceleration of a body gives us the force of acting on it. In other terms, acceleration of a body can be defined as the ratio of change in velocity and change in time.
In a graph with speed or velocity on X axis and time on Y axis, the slope of the curve gives us acceleration as output.
how is energy can be changed from one state to another?
Answer:
Explanation:
Heat is probably the easiest energy you can use to change your physical state. The atoms in a liquid have more energy than the atoms in a solid. There is a special temperature for every substance called the melting point.They are changes in bonding energy between the molecules. If heat is coming into a substance during a phase change, then this energy is used to break the bonds between the molecules of the substance. EXAMPLE: Solid ice melting into liquid
A student was trying to find the relationship between mass and force. He placed four different masses on a table and pulled them using a spring scale. The table shows the different masses used in the experiment and the force required to pull each mass. The student concluded that more force was required to pull heavier objects. What comment would you make regarding his conclusion? A) No clear relation can be observed between mass and force from the data. B) There is a direct proportion between the mass and force listed in the table. C) Gravity should have been taken into account while performing the experiment. D) There is an inverse proportion between the mass and force listed in the table.
Mass (kg) Force (N)
5 25
10 50
15 75
20 100
Answer:
B. There is a direct proportion between the mass and force listed in the table.
Explanation:
From the table, the values of force increases with increase in the value of mass.
if 5kg=25 N
Finding the contant of proportionality k;
k=25/5=5
thus M=k(F)...........where M is mass in kg and F is force in newton, then
M=5F
This show that for every value of mass, we get the value of Force if we multiply by a contant k=5
This means there is a direct proportionality relation between mass and force in the table.
Answer: Correct answer is B.
Hope this helps.
What does Newton’s law of universal gravitation say about the distance between objects?
It says: The bigger the distance between objects the smaller the gravity between them.
Write a hypothesis about how the mass of a cart affects the acceleration of the cart. Use the "if . . . then . . . because . . .” format and be sure to answer the lesson question: "How do force and mass affect the acceleration of an object?”
edge sample response for lab :
If the fan speed increases, then the acceleration increases because a greater fan speed supplies more energy to move the cart.
If the mass of the cart is increased, then the acceleration of the cart is decreased and vice versa
The mass of a cart is inversely proportional to the acceleration of the cart. Inverse proportionality means that increase in one quantity leads to decrease in the other quantity.
Hence, if the mass of the cart is increased, the acceleration of the cart increases and if the mass of the cart is decreased, the acceleration of the cart is increased.
The force applied to an object is directly proportional to the acceleration given to the object when the mass of the object is kept constant. F= ma
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The tip of the fan blade is 0.61 m from the center of the fan. The fan turns at a constant speed and completes 2 rotation every 1.0s
Answer:
What is the centripetal acceleration of the tip of the fan blade?
6.0 m/s2
48 m/s2
53 m/s2
96 m/s2
Answer is 96
Explanation:
Answer:
d
Explanation:
Polar molecules have _____. A) an uneven distribution of charges around the molecule B) atoms that are the same element C) an even distribution of charges around the molecule D) ionic bonds
Answer: ionic bonds
Explanation:
Answer:
D) ionic bonds
Explanation:
Polar molecules are defined as the molecules in which we will have two poles or we can say that in these type of molecules the positive and negative center of the charge is separated by small distance.
this system of charge which is separated by small distance is known as dipoles or polar molecules.
Here we know that these two charged molecules will separate by small distance so here the force between these molecules are due to electrostatic force and hence they form a strong bond between the molecules.
This strong bond between charged molecules is known as Ionic Bonds
So here correct answer will be
(D) ionic Bond
Fill in the blanks to complete the statements.
If an object changes speed on
results in acceleration
its velocity also changes. Any change in
Answer:
When an object changes speed (increases/decreases) it results in acceleration/de acceleration, its velocity also changes.
Explanation:
Acceleration is the rate of change in velocity.An object can accelerate when speed increases, decreases or direction changes. All these instances involves a change in velocity.Velocity is a vector quantity thus it has magnitude and the direction.Acceleration due to change in direction is centripetal acceleration.The expression for finding acceleration is;
a=change in velocity/change in time
a=Δv/Δt in m/s²
Answer:
direction and velocity
A group of organisms that is able to interbreed is called a
a. kingdom
b. family
c. class
d. species
Answer:
D species
Explanation:
According to the most widely used species definition, the biological species concept, a species is a group of organisms that can potentially interbreed, or mate, with one another to produce viable, fertile offspring. In this definition, members of the same species must have the potential to interbreed.
what is meniscus in Physics?
The curve at the liquid's surface by which you measure the volume of a liquid.
Anyone who answers this correctly, i will mark as brainiest.
Constructive interference results in a wave with a ____ amplitude than any of the component waves.
Answer:Constructive interference results in a wave with a greater amplitude than any of the component waves.
Explanation:
What is the difference between chemical change and a physical change?
Answer:
chemical change through chemical process .
physical change means change in dimension.
A chemical change involves a change in the substance's composition, creating new substances with different properties, typically through reactions such as rusting or combustion. In contrast, a physical change alters a substance's form without affecting its composition, as in melting or condensation processes. The processes can also be classified as exothermic (releasing heat) or endothermic (absorbing heat).
Explanation:The difference between a chemical change and a physical change pertains to the composition of the substance in question. A chemical change always results in the production of a new substance with different properties from the original matter. For example, the formation of rust from iron, or the combustion process in burning, are chemical changes. These result in the creation of substances distinct from the original matter.
On the other hand, physical changes do not affect the composition of the substance, but alter its state or form, such as the melting of ice into water or the condensation of steam into liquid water. These changes, while observable, do not produce new substances, hence maintaining the original properties of the matter.
Physical and chemical changes can also be differentiated based on whether they release or absorb heat, with exothermic processes releasing heat and endothermic processes absorbing heat. For example, the burning of a fuel is an exothermic process, while the operation of a cold pack is an endothermic process.
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HURRY!!!
The graph shows the population of gray fox in an area of the United States.
Which best describes the population size between 1990 and 2011?
mostly stable and unchanged
many increases and decreases but declined overall
slowly increased over time
several sharp declines but grew overall
many increases and decreases but declined overall
Answer:
According to the graph, the population size of gray fox in the United States from 1990 to 2011 had many increases and decreases but declined overall.
Explanation:
The gray fox is a species of carnivorous mammal of the Canidae family distributed by the American continent, from the south of Canada to Venezuela.
Gray foxes are occasional hunting targets, mainly for the use of their fur, but also for illicit pet trade purposes. Although gray foxes are hunted, it is not as common as in other types of foxes, since the degree of their coats is perceived as inferior in quality. Several thousand gray foxes are caught for fur acquisition each year, notes the Minnesota Department of Natural Resources.
What type of season does Daytona Beach, FL most likely have?
very cold winters
mild winters
very hot summers
no winters
i think its very hot summers
This question is very unscientific. It uses a lot of rubber words ... "very cold", "mild", and "very hot" ... words without definite meanings, that mean different things to different people, and may even mean different things to the same person at different times.
To me, any place in North America located south of the latitude of Chicago has a climate characterized by very hot, very humid, very oppressive, mercilessly long Summers, and weak, anemic, negligible, absurd excuses for Winters.
Why do objects under water appear to be bigger or closer than what they do in air?
An object seen in the water will usually appear to be at a different depth than it actually is, due to the refraction of light rays as they travel from the water into the air.
A student drew this diagram of Woese’s modern system of classification.
DOMAIN
KINGDOM
PHYLUM
ORDER
CLASS
FAMILY
GENUS
SPECIES
What is the error in this diagram?
The top level is missing.
The class and order levels are switched.
The bottom level is missing.
The kingdom and family levels are switched.
Answer:
The class and order levels are switched
Explanation:
Woese's classification starts with a division in three parts of all the organisms, which is their domain, so according to him there's Bacteria, Archaea, and Eukaryota. After the domain we have the kingdom, then phylum, class, order, family, genus, and species at the end.
We can take the leopard as an example:
Domain - Eukaryota
Kingdom - Animalia
Phylum - Chordata
Class - Mammalia
Order - Carnivora
Family - Felidae
Genus - Panthera
Species - Panthera pardus
Which of the following statements about gravitational potential energy is not true?
A.Its magnitude is related to the work done by lifting an object.
B It depends on the choice of a coordinate system.
C. It is equal to the force required to move an object times the distance it is moved.
D.It is equal to the kinetic energy of the falling object at y = 0.
Answer:
B and D
Explanation
Gravitational potential energy does not relate to graphs and it is about a moving object so b and d would not be correct
The option is (C). Gravitational potential energy is equal to the force required to move an object times the distance it is moved.
The force needed to move an object multiplied by the distance traveled is not a direct equation for the gravitational potential energy. The position or height of an object within a gravitational field, rather than the force used to move it, determines the gravitational potential energy.
Gravitational potential energy is directly related to the work involved in lifting an object against the force of gravity, and its size is inversely proportional to the work involved in lifting an object. The change in potential energy is equal to the quantity of work that is completed.
It depends on the coordinate system chosen: The choice of a reference point or a location with zero potential energy in a selected coordinate system determines the gravitational potential energy. Usually, this reference point is placed at a suitable area, like the Earth's surface.
It is equivalent to the falling object's kinetic energy at y = 0: As an item descends to a reference point where its potential energy is zero, gravitational potential energy can be totally converted to kinetic energy. According to the principle of energy conservation, the potential energy is completely transformed into kinetic energy at that point (y = 0).
Hence, the option is (C). Gravitational potential energy is equal to the force required to move an object times the distance it is moved.
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This photo shows sugar dissolved into a solution with excess sugar at the bottom of the jar this type of solution is classified as?
A. Unsaturated
B. Compound
C.saturated
D.plasma
Answer:
C. Saturated
Explanation:
When the solution is supplied with excess sugar the excess crystals descend to the bottom of the solution creating an area of very high concentration thus the bottom becomes saturated since no more solute can be added to dissolve.
On an amusement park ride passengers accelerate straight downward from rest to 22.9 m/s in 2.2 s.
What is the average acceleration of the passengers on this ride?
Given,
Initial Velocity (u) = 0 m/s
Final Velocity (v) = 25.9 m/s
Time (t) = 2.5 sec
avg. acceleration = ?
avg. acceleration = v-u/t
avg = 25.9/2.5 = 10.36 m/s²
avg = 10.36 m/s²
Answer:
Acceleration, [tex]a=10.4\ m/s^2[/tex]
Explanation:
Given that,
Initial velocity of the ride, u = 0 (at rest)
Final speed of the ride, v = 22.9 m/s
Time taken, t = 2.2 s
Let a is the acceleration of the passengers on this ride. It can be calculated using the formula of the acceleration as :
[tex]a=\dfrac{v-u}{t}[/tex]
[tex]a=\dfrac{22.9-0}{2.2}[/tex]
[tex]a=10.4\ m/s^2[/tex]
So, the time required to bring the car to a stop is [tex]10.4\ m/s^2[/tex]. Hence, this is the required solution.
If your car runs out of gas and you must push it 250 m to the nearest gas station. How much work is done on the car if it is pushed with a constant force of 7 N.
Answer:
1750 Joules.
Explanation:
Work done = force * distance
= 7 * 250
= 1750 Joules.
What is the scientific definition of energy? A. the ability to use the stored potential of an object B. the ability to use the change in temperature of an object C. the ability to use the change in direction of an object D. the ability to do work
D the ability to do work
Explanation:
Energy, in physics, the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms.
if two identical cars are traveling at different velocities, which car has the greatest momentum
Answer:
The one with highest velocity
Explanation:
The momentum of an object is given by
[tex]p=mv[/tex]
where
m is the mass of the car
v is the velocity of the car
In this problem, we have two identical cars: identical means they have same mass, so
[tex]m_1 = m_2 = m[/tex]
The momentum of car 1 is
[tex]p_1 = mv_1[/tex]
while the momentum of car 2 is
[tex]p_2 = mv_2[/tex]
By comparing the two expressions, we see that the car with greatest momentum is the one with highest velocity, since the mass is the same.
An atom contains 15 neutrons and has a mass number of 30. What is its atomic number? How did you determine the atomic number?
Answer:
15
Explanation:
The mass number is defined as the total number of protons and neutrons. The atomic number is total number of protons. And since we have the mass number and number of neutrons, we can use simple subtraction (30 - 15) to find that the atomic number is 15.
The atomic number is found by subtracting the number of neutrons from the mass number; thus, with 15 neutrons and a mass number of 30, the atomic number is 15.
The atomic number can be determined by subtracting the number of neutrons from the mass number. Given that the atom contains 15 neutrons and has a mass number of 30, we can find the atomic number by using the formula: atomic number = mass number - number of neutrons.
This yields an atomic number of 15 (30 - 15 = 15), which indicates that there are 15 protons in the atom.