Physics Middle School

In a heat engine, if 700 J of heat enters the system, and the piston does 400 J of work, what is the final internal (thermal) energy of the system if the initial energy is 1,200 J?

1,100 J

1,500 J

900 J

300 J

Answers

Answer 1

The answer is 1500 J

 consider the variables in the equation for the first law of thermodynamicis .

Related Questions

a bat experts a 120 N force on a 0.134 kg baseball for 0.04 seconds. what impolse is excerted on the bat

Answers

The impulse exerted by a force F on an object in a time [tex]\Delta t[/tex] is given by
[tex]I = F \Delta t[/tex]
In our problem, we have a force of 120 N: F=120 N, applied to the baseball for a time of [tex]\Delta t=0.04 s[/tex]. Therefore the impulse is
[tex]I=F \Delta t = (120 N)(0.04 s)=4.8 Ns[/tex]

Use the graph to fill in the missing temperature, salinity, and density values on the table.

Answers

Answer:

Positon      value to fill in

A              1.025 g/cm^3

B               34%

C               15°C

Explanation:

1) The first value to fill in is the density on position A.

The procedure is using the temperature given, i.e. 20°C, and the salinity, 35ppt, with the graph.

Place your ruler on the horizontal axis on the mark of 35% and go upward vertically until reaching the horizontal lecture of 20°C, the intersection points is on the curve of density 1.025 g/cm^3.

So, that is the density to put on the table for the position A: 1.025 g/cm^3.

2) The next value to find is the salinity on position B.

Use the temperature 25°C and the density 1.023.

Move horizontally from the vertical read of 25°C to the right until you reach the curve with 1.023 g/cm^3 density. Then move vertically downward to read the salinity which is 34%.

Fill in the blank of position B that value: 34%.

3) The final blank corresponds to the temperature on the position C.

Moving upward from the salinity 35% until the curve density = 1.026 g/cm^3, you find that the intersection is at temperature 15°C.

That is the value to put on the missing value for position C: 15°C.




PLEASE PLEASE HELPP
Which of the following describes how the Mid-Atlantic Ridge formed on Earth at a divergent plate boundary?

Plates moved in closer
Plates slid past each other
Plates moved with each other in the same direction
Plates moved apart

Answers

According to my research on Wikipedia, the plates moved apart and/or slid past each other. I hope this helps. Have a great supercalifragilicsticexpialidocioius day!


It is when plates move in closer together as plate material is subducted and is lighter and more gaseous that magma in the mantle so it rises to the surface and pushes up between the gap in the plates to form the Mid Atlantic Ridge

Which magnetic property best describes a magnet’s ability to act at a distance?

Answers

magnetic field describea magnet's ability to act at a distance

Magnets have magnetic fields.

photon energy is proportional to which of the following. a. speed of light in a vacuum. B frequency of the light emitting the photon. C intensity of the light emmitting the photon. D wavelegnth of light emmitting thr photon.

Answers

We have that according to the quantum theory from Planck, E=h*f where h is a constant and f is the frequency, thus B is correct. Let's analyze the other choices: The speed of light in vacuum is irrelevant to the energy of the photon. The instensity of a light source is correlated to the amount of photons in that light beam but it does not affect individual photons. Finally, if l is the wavelength of light, l*f=c. Substituting this in the first equation we see that photon energy is inversely proportional to the wavelength.

Which body part would most likely be affected by the improper application of a compression wrap?

Answers

It could be your arms or legs

Answer:

Tendons

Explanation:  A compression wrap is a strip of cloth that one can wrap around  a strain or sprain. Its pressure helps in reducing swelling and the injury starts to heal itself.

A tendon connects muscle to bone for the proper functioning of the body. It is basically a band of fibrous connective tissue capable of withstanding tension.

What is the frequency of a clock waveform whose period is 750 microseconds?

Answers

use this formula to find your answer...

Determine the frequency of a clock waveform whose period is 2us or (micro) and 0.75ms

frequency (f)=1/( Time period).

Frequency of 2 us clock =1/2*10^-6 =10^6/2 =500000Hz =500 kHz.

Frequency of 0..75ms clock =1/0.75*10^-3 =10^3/0.75 =1333.33Hz =1.33kHz.

The frequency of a clock waveform whose period is 750 microseconds would be 1333.33 Hertz because the frequency is the reciprocal of the time period of the waveform.

What is the frequency?

It can be defined as the number of cycles completed per second. It is represented in hertz and inversely proportional to the wavelength.

frequency of the waveform = 1 /time period of the waveform

As given in the problem we have to find the  frequency of a clock waveform whose period is 750 microseconds,

Then the number of cycles per second is known as the frequency

f = 1 /( 750 ×10⁻⁶)

f =1333.33 Hertz

Thus, the frequency of a clock waveform would be 1333.33 Hertz.

Learn more about frequency from here, refer to the link;

brainly.com/question/14316711

#SPJ2

Which of the following is the best evidence that work has been done on or by an object?

Answers

The answer is A.The energy of the object has changed.

The change in the energy of an object is the best evidence that work has been done on or by an object. Thus, the correct option is A.

What is Work done?

Work is done on an object or by an object whenever a force is applied on the object that moves it over a certain distance or change the energy of the object. This movement is a result of energy change.

We can calculate the energy transferred to an object, or the work done, by simply using the formula where we multiply the force by the distance moved in the direction of the force applied.

Therefore, Energy transferred = work done = force × distance moved in the direction of the force.

W = f × d

Therefore, the correct option is A.

Learn more about Work here:

https://brainly.com/question/18094932

#SPJ6

which statement accurately describes what happens when ice melts in terms of energy

Answers

When the ice melts, it changes from a solid state to a liquid state.

 When it is heated, the kinetic energy of the molecules that compose it, increases, the energy that the ice received, is transformed into potential energy and the content of kinetic energy stays constant. This causes a variation in the order of the ice molecules, which have a fixed position when the matter is in solid state.
In terms of energy the ice absorbs energy causing the molecules of water to have more kinetic and potential energy, changing their configuration from a solid to a liquid.

What is an atom? what are electrons,protons,and neutrons?

Answers

An atom is the building block of all matter. Electrons, protons and neutrons make up the atom. protons and neutrons make up the nucleus of the atom, and the electrons are on the electron shell.
Atom is the basic unit of a chemical element. An electron is the negative charge in every atom. A proton is the positive charge of every atom. A neutron is neutral.

In the alpha decay of Francium-221, what daughter element is produced? (You may need to refer to the periodic table in the lesson.)

Answers

In an alpha decay, the original nucleus decays into a daughter nucleus + an alpha particle, which consists of 2 protons and 2 neutrons.
The atomic number (number of protons) of the Francium is 87, and since in the decay it loses 2 protons, the atomic number of the daughter nucleus should be 85. Looking at the periodic table ,this corresponds to Astatine, and therefore this is the element produced in the alpha decay of Francium-221.
Moreover, the mass number (number of protons+neutrons) decreases by 4 (because an alpha particle carries 2 protons+2 neutrons), therefore in the reaction the mass number will decrease from 221 to 217. 
So, the daughter element is astatine-217.

217   AT

 85      (i don't have enough characters so ignore this part)

Waves 1 and 2 show different sound waves. Look carefully at the two waves. In what way do their wave characteristic differ ?

Answers


-- The amplitude of Wave-1 is greater than the amplitude of Wave-2 ...
possibly 3 or 4 times as great.

-- The wavelength of Wave-1 is longer than the wavelength of Wave-2 ...
maybe almost twice as long.

-- The frequency of Wave-2 is greater than the frequency of Wave-1 ...
maybe almost twice as frequent.

The correct answer is :    D) Wave 1 has a longer wavelength and a higher amplitude than wave 2.

HOPE I HELPED!!!Thanks @AL2006

what evidence of a chemical change is observed when rust forms on iron

Answers

Final answer:

The formation of rust on iron is evidence of a chemical change, characterized by a change in color, the release of energy, and the creation of a new substance, iron oxide.

Explanation:

When rust forms on iron, it is an indication of a chemical change occurring. This process, called corrosion, specifically rusting, involves iron (Fe) reacting with oxygen ([tex]O_2[/tex]) in the presence of water ([tex]H_2O[/tex]) to form iron oxide ([tex]Fe_2O_3[/tex]), which is rust.

The evidence of this chemical change includes a color change where iron turns from a dark grey to rusty reddish-orange, the release of energy in the form of heat (although this release is often too slow to be felt by touch), and the production of a new substance with different properties from the original iron and oxygen.

A car has a mass of 1000 kg and is moving with a velocity of 10 meters/second. What is the momentum of the car?

Answers

P=M*v
1000*10= 10,000
The momentum of the car is 10,000

An embryo created by male-female reproduction has traits from _____.

A.the male only
B.the female only
C.both the male and the female
Please help I will mark as most brainliest

Answers

C.) Both male and female
Hope this helped!
The answer would be C. If a person has one parent with blond hair and blue eyes another with brown hair and eyes it is possible for them to have brown hair and blue eyes. That means that it is possible to have traits from both parents.

Please help
The wave pictured below represents a sound wave. If the distance from "A" to "B" increased, what would happen to the pitch?

Answers

It’s D. The pitch would be lower. I’m 100% sure. I just took the test. I hope this helps you!! <3

When  the distance from a to b was increased, the pitch of the sound would be lower.

What is the pitch of a sound?

The pitch of a sound is known to be how high or low the sound that is played is.

A high sound is known as a sound that has a high pitch and a low sound is known to be the one that has a low pitch.  In the above picture, the pitch will be lowered when the distance is increased.

Learn more about pitch  from

https://brainly.com/question/61859

A particular star is white. Another star that is much hotter is expected to be ______.
red
yellow
orange
blue

Answers

blue

hope this helps :)

Blue would be my final answer

As light shines from air to another medium, i = 30.0o, the light bends toward the normal and refracts at 22.0o. What is the index of refraction? n = _____

Answers

The answer is n = 1.3347
the answer is 1.33 ...i think

The power of imagination helps a scientist to propose valid scientific explanations about the solar system use biased methods to answer questions about the solar system pose questions about the solar system which are not reasonable create theories about the solar system which are not acceptable

Answers

The first option is the correct answer - The power of imagination helps a scientist to propose valid scientific explanations about the solar system. As the option implies, what the scientist gets by imagination is simply a proposition (scientifically called an hypothesis), since there is limited evidence. The scientist's imaginations, and the propositions thereof, is the starting point for further investigation that yields valid scientific theories.

The power of imagination is integral to proposing scientific theories, particularly in the study of the solar system; however, these theories must be tested against experimental data to be accepted. Kepler's imaginative approach led to the formulation of laws that underpin our understanding of planetary motion, highlighting the scientific method's reliance on creativity tempered by empirical validation.

The power of imagination plays a crucial role in the scientific method, especially when it comes to understanding the solar system. Scientists use their creativity to construct theoretical models of how the universe could function and then perform experiments to see which models hold. For example, the work of Johann Kepler, who proposed the laws of planetary motion, showcases how imaginative concepts can lead to significant scientific advancements. While Kepler's models were initially based on mystical ideas, they eventually contributed to our modern understanding of celestial dynamics. Thus, the imaginative component of science allows for the proposal of new and sometimes revolutionary theories, but ultimately, it's through experimentation and data that these theories are validated or refuted.

Science thrives on new ideas and is always ready to assess the validity of different models and theories through careful experimentation. As new data come to light, scientists continuously refine their theories to reflect the most accurate understanding of the natural world. This process illustrates the dynamic and adaptive nature of scientific inquiry, which values empirical evidence overall.

In the fishbowl, the glass, water, rocks, and plastic plants are in thermal equilibrium. This situation means the temperature of the rocks is ??F. If the water is 75 degrees

Answers

The correct answer to this question is 75 degrees F.

Explanation :

It is given that In the fishbowl, the glass, water, rocks, and plastic plants are in thermal equilibrium. Thermal equilibrium is defined as the condition when all particles of the system are at the same temperature.

The temperature of the water is 75 degrees. So, using the concept of thermal equilibrium it is clear that the temperature of all the elements present inside fish bowl will be the same as that of water.

So, the temperature of the rocks is 75 degrees F.

Find the angle formed by two forces of 7N and 15N respectively if its result is worth 20N

Answers

First, you need to make certain assumptions before solving this question. Why? Because there are no information given about the direction of these forces. In such questions as above, ALWAYS make the following assumptions:

1) Take first force, say [tex]F_{1}[/tex], and assume that it is pointing towards the x-direction.

Let us take the 7N force! By keeping the above assumption in our minds, the force vector would be like:
[tex]F_{1}[/tex] = [tex]7i[/tex], where [tex]i[/tex] = Unit vector in the x-direction.

2) Take the second force, say [tex]F_{2}[/tex], and assume that it is making an angle [tex] \alpha [/tex] with the first force [tex]F_{1}[/tex].

Let us take the 15N force! By keeping the above assumption in our minds, the forces vector would be like:

[tex]F_{2} = (15*cos \alpha)i + (15*sin \alpha )j[/tex]

Now from simple vector addition, we know that,
[tex]F_{R} = F_{1} + F_{2}[/tex] --- (A)

Where [tex]F_{R}[/tex] = Resultant vector.
NOTE: In equation (A), all forces are in vector notation. Assume that there is an arrow head on top of them.

Let us find [tex]F_{1}+F_{2}[/tex] first!
[tex]F_{1}+F_{2}[/tex] =  [tex]7i+(15*cos \alpha)i + (15*sin \alpha )j[/tex]

=> [tex]F_{1}+F_{2}[/tex] =  [tex](7+15*cos \alpha)i + (15*sin \alpha )j[/tex]

Now the magnitude of [tex]F_{1}+F_{2}[/tex] is,
| [tex]F_{1}+F_{2}[/tex]| = [tex] \sqrt{ (7+ 15*cos \alpha)^{2} + (15*sin \alpha )^{2}}[/tex]

=> | [tex]F_{1}+F_{2}[/tex]| = [tex]\sqrt{ 49 + 225*(cos \alpha)^{2} + 210*(cos \alpha)+ 255*(sin \alpha )^{2}}[/tex]

Since [tex](sin \alpha)^{2} + (cos \alpha)^{2} = 1[/tex], therefore,

=> | [tex]F_{1}+F_{2}[/tex]| = [tex]\sqrt{ 49 + 225 + 210*(cos \alpha)}[/tex]

Since  | [tex]F_{1}+F_{2}[/tex]| = |[tex]F_{R}[/tex]|, and the magnitude of the resultant force is 20N, therefore,

 |[tex]F_{R}[/tex]| = | [tex]F_{1}+F_{2}[/tex]|
20 = [tex]\sqrt{ 49 + 225 + 210*(cos \alpha)}[/tex]

Take square on both sides,
400 = [tex] 49 + 225 + 210*(cos \alpha)[/tex]
[tex](cos \alpha) = \frac{3}{5} [/tex]

[tex] \alpha = 53.13^{o}[/tex]

Ans: Angle formed by the two forces, 7N and 15N, is: 53.13°

-israr

The metric unit of measurement for force is the _____.

pound
Newton
foot-pound
Newton-meter

Answers

Newton is the answer
The metric unit of force is the Newton.

Which of the following statements about the Sun is true?

Answers

The answer is C.

The sun's size is average compared to other stars in the galaxy, and there are billions of stars in the galaxy.

Hope this helps!
Hi there, friend!

I believe C is the correct choice.

~Brooke❤️

how to find current in a series circuit

Answers

Divide the battery voltage by the sum of all the resistances in the series circuit. The quotient is the circuit current, in Amperes.

Answer: To find the current in a series circuit, you can follow these steps:

1. Identify the values of the resistors in the circuit. These values are usually given in ohms (Ω) and can be labeled with different letters or numbers.

2. Calculate the total resistance (R) of the circuit by summing the individual resistances. For a series circuit, the total resistance is simply the sum of all the resistances.

Explanation:

Example: If you have three resistors with values R1 = 10 Ω, R2 = 20 Ω, and R3 = 30 Ω, the total resistance (R) would be R = R1 + R2 + R3 = 10 Ω + 20 Ω + 30 Ω = 60 Ω.

3. Determine the total voltage (V) across the circuit. The total voltage is usually given and can be labeled as V or E.

4. Use Ohm's Law, which states that the current (I) flowing through a circuit is equal to the voltage (V) divided by the resistance (R). Mathematically, it can be expressed as I = V / R.

Example: If the total voltage (V) across the circuit is 120 volts and the total resistance (R) is 60 Ω, the current (I) flowing through the circuit would be I = V / R = 120 volts / 60 Ω = 2 amps.

So, in this example, the current in the series circuit is 2 amps. Remember to always include the appropriate units (A for amps) in your final answer.

It's important to note that in a series circuit, the current remains the same at all points in the circuit. So the value you find for the current is the same for every resistor in the circuit.

Which stars have the lowest absolute brightness?
Supergiants
Giants
Yellow stars
Dwarfs

Answers

Answer:

DWARFS

Explanation:

Answer:

Dwarfs

Explanation:

I got it right on my test :)

Hope this helped!~

xox

A virtual image produced by a lens is always
A. located in the back of the lens.
B. smaller than the object.
C. larger than the object.
D. located in front of the lens.

Answers

The Answer Is D Because When Uu Magnify Large Items The Image Is Reflected Back To The Magnifying Glass Which Makes The Image Appear In The Back

Option (D) is correct. The virtual image is always firmed in front of the lens or on the same side of the lens as of the object.

Explanation:

The image formed by the lens are categorized in two broad categories.

Real ImagesVirtual Images

The Real Image is a image that is formed by the actual meeting of the incoming rays from the object. The real image is an image that can be obtained on the screen.

The Virtual Image is an image that is formed by the the imaginary meeting of the incoming rays from the object. The virtual image cannot be obtained on the screen.

Since the real image is formed by the actual meeting of the rays, the rays would meet on the other side of the lens as that of the object. It means that a real image is formed behind the lens whereas for a virtual image, the diverging rays from object are extended in backward direction and made to meet on the same size as that of the object.

Thus, Option (D) is correct. The virtual image is always firmed in front of the lens or on the same side of the lens as of the object.

Learn More:

1. Nature of the image formed by the mirror https://brainly.com/question/11743071

2. What type of mirror do dentist use brainly.com/question/997618

3. A small bulb has a resistance of 2 ohm when cold brainly.com/question/10421964

Answer Details:

Grade: Middle School

Subject: Physics

Chapter: Lens

Keywords:

virtual, image, real, object, rays, incoming, converging, diverging, lens, back of lens, front, smaller, larger, screen, obtained.

I need help fast. what is the definition of Kinetic molecular model

Answers

it state that the average kinetic energy from a gas particle depends only on the temperature of the gas

why does biodiversity contribute to a habitats sustainability

Answers

The two factors that contribute tobiodiversity are the richness in the number of different species available in the ecosystem, or the richness in the number of individuals of the one species. This is because each species has a role in the ecosystem on which other organisms depend for survival.
every species has a role in their ecosystem on which other organisms depend on for survival

What happens during heat transfer within Earth?

Warmer, more dense material sinks
Warmer, less dense material rises
Cooler, more dense material rises
Cooler, less dense material sinks

Answers

Answer: (B) Warmer, less dense material rises

Explanation: thius happens when heat transfers because air thins out causing less dense materials to rise up in the air

I hope this helps :)

During heat transfer within Earth, Warmer, less dense material rises.

What is convection of heat?

Convection (or convective heat transfer) is the movement of fluid that transfers heat from one location to another. Convective heat transfer is often discussed as a separate method of heat transfer, but it actually involves the combined processes of conduction (heat diffusion) and advection (heat transfer by bulk fluid flow). In liquids and gases, convection is usually the dominant mode of heat transfer.

It should be noted that this definition of convection only applies to heat transfer and thermodynamic contexts. To distinguish the two, it should not be confused with the dynamic fluid phenomenon of convection, which is commonly referred to as Natural Convection in thermodynamic contexts.

As within the Earth,  heat flows by convection,  Warmer, less dense material rises.

Learn more about convection  here:

https://brainly.com/question/16635311

#SPJ3

Describe the structure of metal

Answers

Metal atoms move freely. The metallic bond is the force of attraction between the free electrons and metal ions. Metallic bonds are strong so metals can keep a regular structure and usually have strong melting and boiling points. 
Other Questions
Laid responsibility for the first world war on germany. dictated that germany would pay reparations and disarm its military. resulted in substantial loss of territory for germany. helped set the stage for european conflict that would eventually result in world war ii. which event is being described by these statements?a.the munich pactb.the treaty of parisc.the treaty of versaillesd.the north atlantic treaty What was the Second Continental Congress created for? A 14 year-old status post injury over one year ago to her left wrist presented with recurrent wrist pain. the patient was taken to the operating room and placed under general anesthesia. she was placed in wrist traction. the radiocarpal joint was entered endoscopically through sharp skin incisions and blunt dissection into the joint. there was found to be mild synovitis in the dorsal ulnar aspect of the wrist. this was debrided arthroscopically with a shaver. there was a peripheral tear of the triangular fibrocartilage. this area was shaved to promote healing. using outside-in technique, a pds suture was placed across the tfcc and into the capsule. there was synovitis within the midcarpal joint, but there was no articular injury. all instruments were removed and the wounds were closed with interrupted nylon sutures. what cpt code(s) is /are reported? How does a good experimental conclusion differ from an inference? Determine the number of protons and neutrons in plutonium-239 and enter its symbol in the form azx. En nuestra religin afrocaribea, creemos que esto protege a los bebs. Es un ________. Why are scientists most likely working on developing cleaner-burning fuel for cars? What are the two most common reasons for modifying the land in South and Southeast Asia?A.aquaculture and flood controlB.manufacturing and tradeC.agriculture and forestryD.mining and fishing Patrick ate 2/3 of a fruit bar write an equivalent fraction for the amount of fruit bar Patrick ate What are the roots of the polynomial equation? x + 7x + 12 = 0 Enter your answers in the boxes. x1= x2= What is the name of the play that Hamlet presents to King Claudius? The Mousetrap The Deathtrap Murder in the Cathedral The Spanish Tragedy How are the energy of infrared, visible light and ultraviolet rays related? And why?A) Infrared contains the least energy and ultraviolet contains the most energy. The energy of a wave is proportional to its wavelength.B) Infrared contains the most energy and ultraviolet contains the least energy. The energy of a wave is proportional to its wavelength.C)Infrared contains the least energy and ultraviolet contains the most energy. The energy of a wave is inversely proportional to itswavelength.D)Infrared contains the most energy and ultraviolet contains the least energy. The energy of a wave is inversely proportional to itswavelength. Monica wants to measure the dimensions of her rectangular lawn. If the longer side of the lawn is (x + 3) feet and the diagonal length is (x + 4) feet, which function can be used to find the shorter side of her lawn?a.] [tex]s(x)= \sqrt{2x+7} [/tex]b.] [tex]s(x)= \sqrt{2 x^{2} +14x+25} [/tex]c.] [tex]s(x)= \sqrt{x^{2} +7x+12} [/tex]d.] [tex]s(x)= {x^{2} +7x+12} [/tex] Read the paragraph belowEach winter we feed the wild birds. Many of the birds come to our feeder from colder parts of the country. We put out crumbs, seeds, suet, and sometimes bits of fruit. The feeder tray is right outside our window. We enjoy watching the birds while they eat.Does this paragraph have unity? Explain your answer. The woman shown in Christinas World appears rather young, but in real life, the subject was a middle-aged woman. Wyeth, who lived in the Maine countryside, looked out his window one day and saw his neighbor crawling across the pasture. Many claimed that the woman feared she would contract a disease called polio, but no one knows for sure. Which would correctly identify the author's meaning for the word contract? Consider the effect of the stressed or unstressed syllable in the word contract. PLEASE HURRYLine segment CT contains the point C(2, 5) and a midpoint at A(1, 3). What is the location of endpoint T? T(4, 11) T(3, 8) T(5, 1) T(0.5, 1) What writings contain the good news message of Jesus of Nazareth Ms. Johnson asked her class to write an equivalent expression to14d - 9 + 21k - 7dk + 2. riley wrote the expression 7dk(2 - 3 - 1) _ 7 ahmad write the expression 7(2d + 3k - dk) - 7 Ariana wrote the expression 7k(2d - 3 - d) - 7who is correct? explain how you know When mergers and acquisitions fail, it is most likely a result of ________ issues? Which description best matches the location of white matter?