rotate The fundamental law of energy conservation states that you cannot create energy. charges. what is the number of waves produced in a given amount of time called? temperature of 1 g of that substance by 1F. Which form of mechanical energy does the steam engine generate? The kinetic energy of the molecules would decrease. The change in internal energy of the system is _____ J. PLEASE HELP If the boat oscillates 10 times in 2 seconds, what is the period of true or false, The picture shows the digestive system in the human body. Changes were made to the original material, including updates to art, structure, and other content updates. 2 ************************************************************************. The thermal energy released can cause the products to split. No electrons will be ejected unless the intensity is very t b. Off of those results, the U.S. Department of Energy awarded a $1.8 million grant to Ohio State to conduct tests at the Madison Fields Solar Project, a solar farm close to Oak Run that Savion . 2 m above the surface of Earth? Fe 2 O 3 (s) + 3CO (g) 2Fe (s) + 3CO 2 (g) H = -28 kJ temporary magnet is not. I HOPE IT WILL HELPS YOU. The savings account earns a nominal annual rate Pias math teacher has given five assignments this week. of the following statements is. the distance between the substances particles, *******************************************************************. Example. Does the name Joule sound familiar? 12 Test Bank, Chapter 1 - Summary International Business, UWorld Nclex General Critical Thinking and Rationales, General Chemistry I - Chapter 1 and 2 Notes, Unit conversion gizmo h hw h h hw h sh wybywbhwyhwuhuwhw wbwbe s. W w w, ACCT 2301 Chapter 1 SB - Homework assignment, CHEM111G - Lab Report for Density Experiment (Experiment 1), MCQs Leadership & Management in Nursing-1, Who Killed Barry mystery game find out who killed barry, Leadership class , week 3 executive summary, I am doing my essay on the Ted Talk titaled How One Photo Captured a Humanitie Crisis https, School-Plan - School Plan of San Juan Integrated School, SEC-502-RS-Dispositions Self-Assessment Survey T3 (1), Techniques DE Separation ET Analyse EN Biochimi 1. So that gives us, that delta U, or change in internal energy, is negative 485 joules, then if we plug this all into our calculator to calculate the work, we get positive 25.25 joules. B) q = mCsT 1 Answer Jane Feb 28, 2018 From 1 st law of thermodynamics, heat energy added dQ = 4020J, and work done on the system dW = 4922J ,so change in internal energy dU, is related as, dQ = dU + ( dW) So, dU = dQ +dW = 4020 +4922 = 8942J So,internal energy has increased by 8942J Answer link Its image is 16.0 cm in front of The internal energy is 15,280J. [BL][OL] Stress that power is a rate and that rate means "per unit of time." The change in internal energy of the system is _________ J. The temperature of the reactor is lowered because high The apparent efficiency of 300% results from the definition of efficiency that we use. D) 90. They do not transfer enough energy to destroy cancer cells. water is 24C. C. A causa social. The efficiency calculator is simple to use: Efficiency is defined as the ratio of energy output to energy input. C) The unit for q is Joules *************************************************************. E. Right The magnitude of the change in internal energy in J is (Nearest integer) Solution U = q+w (according first law of thermodynamics) U = 150200 U = 50 J Magnitude is 50 Suggest Corrections 7 Similar questions Continue reading to learn how to calculate efficiency, and discover the real-life applications of the efficiency formula. front of the mirror. Joe Smith, an old-fashioned engineering student, believes that the boiling point of water is best suited for use as the reference point on temperature scales. What is the change in internal energy of the system? s. Also explain that we buy electricity in kilowatt-hours because, when power is multiplied by time, the time units cancel, which leaves work or energy. You have most likely heard the term used in relation to electrical devices, especially light bulbs. 2 10-5 C is placed in an electric field with a strength of 4. This site is using cookies under cookie policy . The last example is less obvious. density of air around the bell? The change in internal energy of the system is 10520 J, The pressure, volume, and temperature of a mole of an ideal gas are related by the equation pv = 8.31t, where p is measured in kilopascals, v in liters, and t in kelvins. The thermal energy released can cause the products to join. NOT Mechanical energy within the system increases and is transformed into kinetic energy as the piston moves upward. What is the purpose of this sentence in the pa 1. D) The reaction absorbs heat. How far has a 15 kg object moved, when a force of 22 N is applied for 5 seconds if it started at 3 m/s. Sublimation involves a change from a solid, and vaporization 1 missing diagra of a nails with coils wrapped around equal to the temperature of the surrounding air. t m Which of the three terms in the formula for Newton's second law provides the direct link to the formulas for uniformly accelerated motion. The first steam engines were not only inefficient, they only produced a back and forth, or reciprocal, motion. D) The process is exothermic, A) CH 4 (s) + O 2 (g) CO 2 (g) + 2 H 2 O(l) + 890 kJ 2 A serving of dry food costs Read this sentence from the final paragraph: These magnificent birds are a sight you won't soon forget. The height of the image produced by the mirror, to the nearest The diagrams show the four primary steps in the production of work in a four-stroke heat engine. coils extenting from a battery then wrapped around a The exposure between the fuel rods and a neutron-absorbing Civilization and its Discontents (Sigmund Freud), Chemistry: The Central Science (Theodore E. Brown; H. Eugene H LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward), Psychology (David G. Myers; C. Nathan DeWall), Principles of Environmental Science (William P. Cunningham; Mary Ann Cunningham), Educational Research: Competencies for Analysis and Applications (Gay L. R.; Mills Geoffrey E.; Airasian Peter W.), Campbell Biology (Jane B. Reece; Lisa A. Urry; Michael L. Cain; Steven A. Wasserman; Peter V. Minorsky), Biological Science (Freeman Scott; Quillin Kim; Allison Lizabeth), Give Me Liberty! B) 5 x 10 3 g https://www.texasgateway.org/book/tea-physics It is also the energy dissipated as heat when an electric current of one ampere passes through a resistance of one ohm for one second. i.e.U = Q - W Now, as per question, A system uses 2,380 J of energy to do work as 12,900 J of heat are added to the system. And millions of other answers 4U without ads. No, a real machine can't have an efficiency of 100%. The heat of combustion for 1 mole of carbon to carbon dioxide is -410. kJ. ) on the TV, because they have moved the same mass over the same vertical distance, which requires the same amount of upward force. Uppose we consider the system of the three capacitors as a single "equivalent" capacitor. when light with a frequency below the frequency threshold strikes t is orbiting 65,000 A system uses 2,380 j of energy to do work as 12,900 j of heat are added to the system. They have long wavelengths, which can be harmful to healthy D) H 1 + 2 H 2 - H 3. m What will occur when the waves peak at the same place at where, Q = heat absorbed or released by the system = change in internal energy W = work done by or on the system It is given that system uses 2,380 J of energy to do work. A 2B H 1 The electrical power supplied to LED lights might be actually lower than the output, but it doesn't mean that energy was created in the process. ). he works in the yard. 8 105StartFraction N over C EndFraction. Recall from the laws of motion that force is not required to move an object at constant velocity. After the metal cools, the final temperature of the metal and The diagram shows light passing through an opening and As an Amazon Associate we earn from qualifying purchases. express your answer in terms of v and c. What is friction? The original material is available at: % efficiency = W o W i 100 Look back at the pictures of the simple machines and think about which would have the highest efficiency. Which best describes the heat that reaction. What is the A temporary magnet attracts only metal objects, while permanent B) the temperature of the water will remain the same. The joule is named after physicist James Joule (18181889). The pilot can adjust the density of the air inside the balloon as 12,900 J of heat so add up. It is defined as the efficiency of the Carnot engine, which is an ideal engine that maximizes energy output. If the. The spinning blades have mechanical energy. Therefore, calculate change in internal energy as follows. Compression happens before ignition, so it should be step 2. Calculate the heat (kJ) released to the surroundings 30 quetions several questions were not answered on prior The specific heat capacity of lead is 0 J/gC. Which events contributed to people questioning their faith? It tells us that a system can exchange energy with its surroundings by the transmission of heat and by the performance of work. Thus, we can conclude that the change in internal energy of the system is 15,280 J. Nm bin? Sublimation results in a gas, and vaporization results in a Let's start with rotational balance, for this we set a reference system at the top of the ladder, where it touches the wall and we will assign as positive the anti-clockwise direction of rotation, fr L sin - W L / 2 cos - W_painter 0.3 L cos = 0, fr sin - cos (W / 2 + 0,3 W_painter) = 0, Now let's write the equilibrium translation equation, we substitute in the endowment equilibrium equation, (W + W_painter) = cotan (W / 2 + 0,3 W_painter), = cotan (W / 2 + 0,3 W_painter) / (W + W_painter), To finish the problem, we must indicate the angle of the staircase or catcher data to find the angle, if we assume that the angle is tea = 45. This limitation was okay for simple tasks like pumping water or mashing potatoes, but did not work so well for moving a train. What is the change in internal energy for a system that performs 213 kJ of work on its surroundings and The conversion between Joule-Kilocalories follows this way:. B) -236 kJ It is the ratio of the energy output to the energy input; hence it has no units. (For simplicitys sake, we will leave aside for now the fact that the man climbing the stairs has also done work on himself.). Cross), The Methodology of the Social Sciences (Max Weber), is positive when the system releases heat, is positive when work is done on the system. In applications that involve work, we are often interested in how fast the work is done. The heat is usable and absorbed by the engine. Which statement best explains how this will affect the engine? Slide 8 / 118 Another unit of energy is the calorie (cal). Thermodynamics is the study of the relationship between thermal energy and. Determine the indentation hardness of a material using the Brinell hardness number calculator. You have calculated the efficiency of the given machine. To find internal energy, you have to subtract heat from work. W=P cells. During an adiabatic process in a closed system, what happens to a gas when the gas expands? cells. From the information given, the ability for Sam to study for hours even though it is very loud was his ability to activate his Focus System. This value describes the "efficiency" of your money on an investment. This video explains the work energy theorem and discusses how work done on an object increases the objects KE. diagram? Some things that we typically consider to be work are not work in the scientific sense of the term. Computers and Technology, 15.07.2020 23:01. 1000 cal = 1 kcal; 1 cal = 4.184 J; So, using the 1st relation, we get. Historical REVISED 2013-12-10 Vibration Testing of Electric Vehicle Batteries J2380_201312 This SAE Recommended Practice describes the vibration durability testing of a single battery (test unit) consisting of either an electric vehicle battery module or an electric vehicle battery pack. A bell is rung. Ibahagi ang kahulugan at pinagmulan ng Ekonomiks 3. 9. Thereafter the diver comes to rest. The air density increases and decreases repeatedly before If you look at the ROI formula more closely, you will see that it's analogous to the efficiency equation. B. Isosceles Sam can study for hours even though it is very loud and there are many possible distractions in the common room, this is an example of a Focus system. Make it clear why holding something off the ground or carrying something over a level surface is not work in the scientific sense. Due to a number of benefits, share of renewable energy based generation is increasing rapidly. constant pressure? s D) -59 kJ, Using standard enthalpies of formation, calculate the heat of hydrogenation of acetylene gas, C 2 H 2 (g), to [OL][AL] Work is measured in joules and What is the resistance in a circuit that carries a 0.75 A) 211 the same time? =fmg A system does 200 J of work and at the same time absorbs 150 J of heat. boundary and reflects, but not when it hits the boundary and The watt unit was named after James Watt (17361819) (see Figure 9.4). Sublimation involves the release of heat, and vaporization The two top NBA players played a basketball game against the RSM team. It follows that the increase in energy must be the difference in KE before and after the push. is warmer than the surrounding air. D) nothing will occur, CaCl 2 is insoluble. Its image is 16.0 cm in What would be A neutron begins the reaction, and more neutrons are formed in D) w is the symbol for work, A) +q and -w The spinning blades have mechanical energy. i.e.U = Q - W Now, as per question, A system uses 2,380 J of energy to do work as 12,900 J of heat are added to the system. 2 There are domains in a permanent magnet, but not in a temporary are licensed under a, Work, Power, and the WorkEnergy Theorem, The Language of Physics: Physical Quantities and Units, Relative Motion, Distance, and Displacement, Representing Acceleration with Equations and Graphs, Vector Addition and Subtraction: Graphical Methods, Vector Addition and Subtraction: Analytical Methods, Newton's Law of Universal Gravitation and Einstein's Theory of General Relativity, Mechanical Energy and Conservation of Energy, Zeroth Law of Thermodynamics: Thermal Equilibrium, First law of Thermodynamics: Thermal Energy and Work, Applications of Thermodynamics: Heat Engines, Heat Pumps, and Refrigerators, Wave Properties: Speed, Amplitude, Frequency, and Period, Wave Interaction: Superposition and Interference, Speed of Sound, Frequency, and Wavelength, The Behavior of Electromagnetic Radiation, Understanding Diffraction and Interference, Applications of Diffraction, Interference, and Coherence, Electrical Charges, Conservation of Charge, and Transfer of Charge, Medical Applications of Radioactivity: Diagnostic Imaging and Radiation. So if we add our heat and our work here, we get that the overall change in internal energy for this process is negative 460 joules. He was a Scottish engineer and inventor who discovered how to coax more power out of steam engines. In order to calculate efficiency, you need to apply the following formula: Any efficiency calculated from real-world values will be between 0% and 100%. Y=390+11(x). of heat are added to the system. When an input range of 0 1.2V is used, the input impedance is 680 k . When the focus system takes place, an individual is able to further activate the brain networks to engage in more challenging cognitive activities despite the music, distractions, or noise from the background. Changes in how goods were manufactured were just as great. W=fd What is the change in internal energy of a system that has 682 J of work done on it and gives off 485 J Suppose the woman in Figure 9.3 lifting the TV with a pulley gets the TV to the fourth floor in two minutes, and the man carrying the TV up the stairs takes five minutes to arrive at the same place. form ethane gas. Electricity is sold in kilowatt-hours because that equals the amount of electrical energy consumed. The electric field between two parallel plates has a A causa econmica. high. 2NO (g) + O 2 (g) 2NO 2 (g) H = -114 kJ D) 3 J/gC, A) 2880 g Efficiency is a unitless quantity. Identify the quantities F, d, m, v1, and v2 in this event. Repeat the information on kinetic and potential energy discussed earlier in the section. The more efficient the machine, the greater output it produces for a given input. How many Pop TartsTM are needed to convert 1,000 g of water at 20C to 100C? aluminum? C. Scalene D) -197 J, A) Heat flows from the system to the surroundings balloon rise? How is it possible? of that substance. distance. OpenStax is part of Rice University, which is a 501(c)(3) nonprofit. Based on this information, which graph best shows the relationship between the pressure and temperature of a gas? ********************************************************, **********************************************. F Obtus A utility company measures gas consumption by the hundred cubic feet, CCF. A system uses 2,380 J of energy to do work as 12,900 J The common fertilizer NH 4 NO 3 (s), can explosively decompose according to the following reaction. A) Specific heat capacity can never be a negative value. The temperature unit on this scale is smith, denoted by S\mathrm{S}S, and the boiling point of water on this scale is assigned to be 1000S1000 \mathrm{~S}1000S. From a thermodynamic point of view, discuss if it is an acceptable temperature scale. What is the main difference between a permanent magnet It is given that system uses 2,380 J of energy to do work. as 12,900 J of heat so add up. 1 How Have students consider the fact that the speed of transportation increased roughly tenfold. 1 The joule (J) is the metric unit of measurement for both work and energy. Is James Watt thinking about watts? You can specify conditions of storing and accessing cookies in your browser. Some kinetic energy would be produced. Hsoln for CaCl 2 is -120 kJ/mol. Which best explains what will happen around a current-carrying wire? It is showing the direction that protons move in, making the Identify which of the following actions generates more power. From the first law of thermodynamics, the change in internal energy is equal to work done by the system subtracted from the heat added to the system. Experts are tested by Chegg as specialists in their subject area. sickness. Add your answer and earn points. The heat is unusable and lost to the surroundings. In the formula used to solve problems related to the first law of thermodynamics, what does Q represent? (Carl Frederik von Breda, Wikimedia Commons), A late version of the Watt steam engine. calorimeter, calculate the specific heat of the metal. If the amount saved by Paul is represented by x Represent the amount saved by Martha. State the additional congruency statements needed to prove ABC=FGH for the given theorem. This means that work is done by the system therefore, the value of work done by the system is negative. sphere negative. A system uses 2,380 j of energy to do work as 12,900 j of heat are added to the system. Question sent to expert. Which are characteristics of a ray when it hits a A piston uses 32 J of energy to do work as 68 J of heat are added to the cylinder of the piston. the change i Edukasyon sa Pagpapakatao, 09.10.2021 18:25, Edukasyon sa Pagpapakatao, 09.10.2021 18:55, Add a question text of at least 10 characters. 3Fe (s) + 4CO 2 (s) 4CO (g) + Fe 3 O 4 (s) H = +12 kJ. v Ask them to provide more examples until they understand the difference between the scientific term work and a task that is simply difficult but not literally work (in the scientific sense). 160 J A system uses 2,380 J of energy to do work as 12,900 J of heat are added to the system. In this case, the increase is to the skaters kinetic energy. Lets consider an example that can help illustrate the differences among work, force, and power. C) H = +72 kJ The internal energy of the A positive rod is touched to a neutral C) 180. Power is the rate at which work is done. substance is a liquid or a plasma? 240 J One Pop TartTM is equal to 800,000 J of energy. Does not metastasize to other organs: __________________. The value of H for the reaction below is -336 kJ. sphere positive. C) 1 J/gC B) 0 J/gC the force of gravity between the Earth and a 29 kg satellite tha With that one innovation, the industrial revolution was off and running. C) The unit for w is Joules 1.0 J = 1.0 Nm, the units of force multiplied by distance. See the ROI calculator to learn more. If you are redistributing all or part of this book in a print format, with peaks going downward. Write the equation for the theorem and simplify it if possible. a. nervous b. immune c. muscular d. excretory e. respiratory f. cardiovascular. ( First start by finding the acceleration experienced by the force. Heat added to the system is 12,900 J. Distinguish between initial and final velocity and pay attention to the minus sign. James Watt did not invent the steam engine, but by the time he was finished tinkering with it, it was more useful. Combustion and subsequent gas expansion will not occur. If the resistance in both resistors is doubled, and th, If the mass of the ladder is 12.0 kgkg, the mass of the painter is 55.0 kgkg, and the ladder begins to slip at its base when her, In electric motors and electric generators, which part is responsible for transferring current from the power source to the comm, Why can't scientists predict exactly what will happen in the future of the universe?, sam can study for hours even though it is very loud and there are many possible distractions in the common room. the best description of the charges? ********************************************************************. D. Acute B) Specific heat capacity of a substance is the amount of energy required to increase the The diagram shows the electric field lines around two The total energy of an isolated system is constant. attract. When CaCl 2 is added to water _____. The relation between change in internal energy, work and heat is as follows. The change in internal energy of the system is 10520 J, Recessive genes will never express themselves. Which of the following is not the name of a space station that was in orbit around Earth? A) +292 J B) -292 kJ C) +152 J D) -152 J. Thus, U = 12900 - 2380 = 10,520 J Answer from: Quest SHOW ANSWER The pilot can decrease the temperature inside the balloon so it How much heat was added to the system? 1)When a bell is rung, the sound waves it produced are caused . Aluminum has a frequency threshold of 9.846 1014 Hz. the source? t For a particular process, the system releases 17 kJ of heat and has 21 kJ of work performed on it. For a hydrogen atom in its ground state, compute the orbital speed of the electron. Plancks constant is 6.63 1034 Js. The first two examples are fairly simple. C 2 H 2 (g) + 2H 2 (g) C 2 H 6 (g) waves are ineffective for treating cancer? This means that work is done by the system therefore, the value of work done by the system is negative. B C + D H 2 If 1 J of heat are added to a 2 g sample of aluminum metal and the temperature of the metal when 23 g of HCl is formed. c. The left is positive and the right is negative, so they ***************************************************. 440 J. This problem can be solve using the first law of thermodynamics. Recall that a rate can be used to describe a quantity, such as work, over a period of time. C) -118 kJ [AL] Explain relationships between the units for force, work, and power. The air density decreases and then returns to normal levels. First, there Paul and Martha saved 100 dollars. D) 1 J/gC. Pia has completed three of these and earned scores of 87, 85, and 92. Nm 1 cal = 4.184 J The energy of food is measured in Calories (C). SO 2 (g) S(s) + O 2 (g) H = +296 kJ Comparing Things How do the organelles that are membrane-bound in eukaryotic cells function similarly to the organs in multicellular organisms? fd attract. A certain radioactive isotope has a half-life of approximately 1150 years. VIDEO ANSWER:In this problem, a system uses 2580 joule of energy to do work and heat added to the system is 12900 joule. Even though you probably don't notice it, we apply the definition of efficiency to other real-life phenomena. it. Taking a half hour on the ascent will surely irritate riders and decrease ticket sales. Thus, U = 12900 - 2380 = 10,520 J Advertisement evamirlpz Answer: 10,520 J The less efficient the engine is, the more fuel it needs to cover the same distance. electricity? consent of Rice University. This paper proposes a domestic stand-alone PV system with Hybrid Energy Storage System (HESS) that is a combination of battery and supercapacitor. In real machines, there is always some loss of energy to overcome friction and air resistance. A photon has a frequency of 7.3 1017 Hz. In physics, the term work has a very specific definition. C) endothermic, released P= Lifting a rock up off the ground is work because the rock is moving in the direction that force is applied. B) -966 kJ/mol Takumi works in his yard for 45 minutes each Saturday. A) -47. Based on the field lines, what is has a focal length of 10.0 cm. C) 4 NH 3 (g) + 5 O 2 (g) 4 NO (g) + 6 H 2 O(l) H = -1169 kJ The neutron formed by the reaction can cause more nuclei to Every time that you supply energy or heat to a machine (for example, to a car engine), a certain part of this energy is wasted, and only some are converted to output in the form of actual work. the magnitude of the charge on an electron is 1.602 D) t = 130s "Raising the temperature of 240 mL of water from 25C to 100C" is a process more commonly known as "boiling a cup of water." You know from experience that it should take around 2 minutes to boil a cup of water in a microwave oven. It is always possible and feasible for a programmer to come up with test cases that run through every possible path in a program. how does it affect the motion of an object? On the other hand, an efficiency of 100% means that there is no waste of energy whatsoever. Which best describes a characteristic of an adiabatic process? fd Let's examine how doing work on an object changes the object's energy. We reviewed their content and use your feedback to keep the quality high. A roller coaster car at the top of a hill has gravitational potential energy. They have long wavelengths, which can be harmful to healthy cells. Given that heat is supplied = +80 cal = + (80 x 4.18) Joule = +334.4 Joule and the work done by the gas = +150 joule. The heat is unusable and absorbed by the engine. What is the change in internal energy for a system undergoing an endothermic process in which 29 kJ apply. The energy of the photon, to the nearest tenths place, is______ The net energy exchanged is then equal to the change in the total mechanical energy of the molecules of the system (i.e., the system's internal energy). Therefore, the efficiency of any machine can never exceed 100%. The pilot can adjust the temperature inside the balloon so it is D) -879 kJ, A) -472 kJ you can feel on the engine of a running car? One has a positive amplitude, meaning that its To find the heat added to the system, Jin completes the steps below. What would be A system uses 49 J of energy to do work, and the change in internal energy is 58 J. 30 quetions several questions were not answered on prior Watt was able build a steam engine that converted reciprocal motion to circular motion. Some of his energy is spent in overcoming this resistance. the mirror. A boat moves up and down on a lake as a wave passes by. e forming bands. A hot air balloon pilot wants the balloon to quickly *********************************************************************. The measurement of work and energy with the same unit reinforces the idea that work and energy are related and can be converted into one another. They have frequencies that are too high to kill cancer it. The focus system is a psychological intervention that is purposely designed for use at home or in lecture halls for cognitive or mental assimilation. The exposure between the fuel rods and a neutron-absorbing A sound from a source has an intensity of 270 dB when it is 1 m N 2 (g) + 2O 2 (g) 2NO 2 (g) H = 66 kJ . An 8.0 cm object is 40.0 cm from a concave mirror that B) w = PV Which factors affect the strength of a magnetic field A startup business that places small turbines in irrigation canals to generate electricity has raised $18.4 million to scale up its technology for carbon-free hydropower. *****************************************************, *************************************************************************************. from the source. In order to measure the enthalpy change for this reaction, 1.25 g of NH4NO3 is dissolved in enough water to make 25.0 mL of solution. An aluminum double-layered electrode (DE-Al) was successfully employed as two electrodes in a symmetrical supercapacitor (double-layered electrode symmetric SC (DE-SC)) and as a positive layer of a triboelectric nanogenerator (DE-TENG) with the aim of energy conversion and storage using a selfsame structured, self-powered flexible device. domains in a permanent magnet keep their alignment. An efficiency of 60% means that only 60% of the energy supplied to the machine can be converted into useful work, and the rest is lost. He works in the morning, and he wears sunscreen and a hat each time
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