Friction is the reason that machines are not 100% efficient. Some of the work gets lost when mechanical energy is transformed into thermal energy.  Sometimes when driving down a windy mountain road, you can start to smell the brake pads. Explain what might be going on there:

Q: Energy that is not utilized for work or heat transfer in the human body is converted to the chemical…

A: The total energy burns is, Eburn=1.2 kcal/min8 hours60 min1 hour+1.7 kcal/min16 hours60 min1…

Q: You observe a grasshopper eating a blade of grass. You know that each blade of grass contains 100…

A: Given that:- Energy contain in one blade of grass=100 units

Q: Which of the following statements is an accurate way to summarize the first law of thermodynamics?…

A: Given are few statements  We have to find out which statement summarizes the first law of…

Q: A system's "entropy" is (a) the amount of work the system can do. (b) the amount of microscopic work…

A: Since entropy is a measure of randomness, so when a system has large number of microscopic quantity…

Q: In a given location, would a helicopter require more energy in summer or winter to achieve a…

A: Helicopter requires more energy in summer to create the same lift . In summer since temperature is…

Q: While riding his bicycle, Jans does 7.5 E7 J of work and gives off 4.3 E7 J of heat. What is the…

A: Given Data:Work done Heat released To Determine:The change in the internal energy of the person.

Q: A person's basal metabolic rate (BMR) is the rate at which energy is expended while resting in a…

A:

Q: After you drive for a while your tires will gain some energy via friction and heat up. If the air…

A: Given  Heat added Q=150J  Work done by gas W=100J

Q: A heat engine uses two containers held at different temperatures. One container is at 294 K, while…

A:

Q: Air conditioners sold in the United States are given a seasonal energy-efficiency ratio (SEER)…

A: To find the COP , use the formula as follows: COP= Tc/(Th - Tc) where Tc is the colder temperature…

Q: Your last exam is done and you have a two week break before the next semester starts. You look…

A: Given situation:You clean the room and create order from disorder.Question:Are you violating the 2nd…

Q: According to their website, a single Wawa Italian Hoagie contains 450 food calories. Refer to…

A: It is given that,

Q: 4. a. A weightlifter curls a 100 kg bar, raising it each time a distance of 0.61 m. How many times…

A:

Q: The U.S. Department of Energy estimates that up to 10 percent of the energy use of a house can be…

A: Annual energy cost,

Q: A sealed container containing water with stirring wings inside is heating up on the stove. In this…

A:

Q: Susan, whose mass is 68 kg, climbs 59 m to the top of the Cape Hatteras lighthouse.a. During the…

A:

Q: A book falls from a table. Suppose some of the thermal energy within the book is spontaneously…

A: Suppose some of the thermal energy within the book is spontaneously converted into kinetic energy…

Q: A soft drink manufacturer clains that a new diet drink is "low Joule." The label indicates the…

A:

Q: A 1600 kg car steadily accelerates from rest to 60 mi/hr over a 2.8 second time span. How much work…

A: Given:mass of car, m = 1600 kgfinal velocity, vf = 60 mi/hr = 26.816 m/s

Q: Air conditioners sold in the United States are given a seasonal energy-efficiency ratio (SEER)…

A: Temperature inside = 24∘ C = 24 +273 K =297 K Temperature outside =35∘C=35+273K =308 K To find SEER…

Q: An ideal gas with an initial temperature of 300 K is isobarically cooled at a pressure of 25 Pa. Its…

A:

Q: Many people have tried to built perpetual motion machines. What restrictions does the first law of…

A: A device that violates the First law of thermodynamics (by creating energy) is called a Perpetual…

Q: 6 The diagram below depicts an ideal monatomic gas which is compressed isobarically at p = 1.18×10…

A:

Q: Gas is sealed within a beaker with a movable piston top.  You decide to place the beaker into a…

A: The heat energy required to flow out of the beaker is,Q=60 J. The work done to compress the gas is,…

Q: A 65.0-kg mountain climber just ate a Johnny Rocket's bacon-cheddar-double-burger meal along with…

A:

Q: A 1,500 kg car traveling at 13.4 m/s (30 mph) applies its breaks and comes to rest in 5.5 seconds.…

A:

Q: An average person is recommended to take in 2000 calories per day (8,400,000J), because they will…

A: An average person needs 8,400,000 J of energy. On a Saturday, a person takes 10,000,000 J of energy…

Q: 3.5x10^7 J of heat transfers into an engine. If 2.1x10^7 J of work is performed what is the…

A:

Q: A 60 kg woman cheats on her diet and eats a 493 Calorie (493 kcal) jelly donut for breakfast. (a)…

A:

Q: (a) How many joules of energy are the equivalent of one jelly doughnut? (b) How many stairs must the…

A: The weight of the woman is w=58 kg. The woman eats 555 kcal.

Q: Sweating is one of the main mechanisms with which the body dissipates heat. Sweat evaporates with a…

A: Sweat evaporates with a latent heat= 2,430 kJ/kg at body temperatureSweat produced = 1.6…

Q: During lunch at Applebees you decide to have the "Butter Pecan Blondie" dessert that contains 1040…

A: Work done on a system can be considered as the change in energy of the system. This change can be of…

Q: A 46-kg woman cheats on her diet and eats a 555-Calorie (555 kcal) jelly doughnut for breaktast. (a)…

A: In this question it is given that a woman with weight 46 kg  is on dieting she cheats her diet and…

Q: When you put on the brakes on your bicycle, friction heats the steel rims of your wheels. Could this…

A:

Q: With respect to orderly and disorderly states, what do natural systems tend to do? Can a disorderly…

A: When the cup is in the waiter's hand, it had some order in it, the whole cup, and the tea in it and…

Q: An electric generator at a power plant produces energy by passing superheated steam from a high…

A: Given data: The high-temperature steam has a temperature of, Th=376 K  The low-temperature reservoir…

Q: A car, initially traveling at a high speed, crashes into a wall. After the crash, the car comes to…

A: car crashed into the wall

Q: When you skid to a stop on your bike, you can significantly heat the small patch of tire that rubs…

A: As mentioned in the question statement, the expression for the normal reaction and bike and rider…

Q: 3. A heat engine does not convert all of the heat that flows through it into mechanical energy.…

A: According conservation of energy, energy can not be created not be destroyed.

Q: A typical coal-fired power plant burns 340 metric tons of coal every hour to generate 2.5 × 106 MJ…

A: The efficiency of the power plant can be given by e=WoutQh×100%

Q: For most automobiles, the number of miles per gallon decreases as highway speed increases. Fuel…

A: Kinetic energy can be expressed as

Q: The internal energy of a 5-kg suitcase starts at 150 kJ. The suitcase is mangled as it travels…

A: Given data, Internal energy of the suitcase = 150 kJ Work done on the suitcase = 10 kJ Heat loss…

Q: What is the highest possible efficiency of a heat engine working between a high temperature…

A: Given TH=600℃ = 873K TC=20℃ = 293K we have to find efficiency Efficiency η = 1- (TC÷TH)

Q: A simple pendulum is suspended from the ceiling by means of a string of length 2.15 m long and has a…

A: Write the given values with the suitable variables. l=2.15 mm=4.08 kgQ=1 Jv=2.83 m/s Here, l, m, Q,…

Q: Rub your hands together vigorously. What happens? Discuss the energy transfers and transformations…

A: Hands are felt warm when rubbed. When we rub the hands,hands are having kinetic energy .It is the…