A driver’s manual states that the stopping distance quadruples as the speed doubles; that is, if it takes 30 ft to stop a car moving at 25 mph, then it would take 120 ft to stop a car moving at 50 mph. Justify this statement by using mechanics and the first law of thermodynamics. [Assume that when a car is stopped, its kinetic energy ( 1 /2mu2) is totally converted to heat.]

Q: Let us use a heat pump to cook dinner! You set up a heat pump that has 40 % of its theoretical…

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Q: One of the foundations of thermodynamics is the "Conservation of Mass." O True O False

A: False, Conservation of energy is fundamental of thermodynamics not the conservation of mass

Q: A gasoline engine has a power output of 200 kW. Its thermal efficiency is 35.0%. (a) How much heat…

A: Power Output of engine, P=200kWThermal efficiency,η=35%=0.35

Q: Suppose a woman does 450 J of work and 9300 J of heat transfer occurs into the environment in the…

A: Workdone by the women is W = 450 J Amount of heat transfer is Q = -9300 J (As heat is going out of…

Q: In a certain thermodynamic process, 20 cal of heat are removed from a system and 30 cal of work are…

A: Given data: Amount of heat removed from the system H=- 20 cal Amount of work done on the system W=30…

Q: Exactly 367 grams of ice are melted at a temperature of 55°C (Lịce-333 J/g ). Find the change in…

A: Solution,  Given that,  Temperature T = 55° C = 55 +273 = 328 K Heat Q= 330×367 J We know that, the…

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 gas expansion, 81 J of heat is absorbed by the system, and the energy of the system decreases…

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Q: This problem compares the energy output and heat transfer to the environment by two different types…

A: The efficiency of the first nuclear power plant is, The efficiency of the second nuclear power plant…

Q: To stop a volcano from destroying a local town you come up with a plan to drop a huge ice cube into…

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Q: (a) How much heat transfer occurs to the environment by an electrical power station that uses…

A: The input heat transfer,

Q: An electrical power station requires 1.1 × 1014 J of heat transfer into the engine and has an…

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Q: Second Law of thermodynamics. An engine in performing 196 J of work discharges 34 J of heat. What is…

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Q: P2-3) It is important for the body to be able to cool itself even during moderate exercise. Suppose…

A: Since you have asked multiple questions, we will solve the first one for you. If you want any…

Q: The second principle of thermodynamics implies that (a) thermal energy cannot be entirely converted…

A: Correct option is A second law of thermodynamics states that , "It is impossible to construct a…

Q: A student evaluates a weight loss program by calculating the number of times she would need to climb…

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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: An automobile engine consumes fuel at a rate of 26 L/s and delivers 65 kw of power to the wheels. If…

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Q: A thermodynamic system is taken from state A to state B to state C, and then back to A, as shown in…

A: Given, Ps=76.0Pa Vs=5.2m³

Q: A hot water heater in a residential home runs for an average of 2.2 hours per day with a heat energy…

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Q: If the gravitational potential energy of the water is equal to the increase in the internal energy…

A: Using the first law of thermodynamics, ΔU=Q-W Here, ΔU is the increase in internal energy, Q is the…

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

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Q: (a) What is the best coefficient of performance for a refrigerator that cools an environment at…

A: Part (a) Given: The temperature that transfer the heat is T1=45 C. The temperature that cools the…

Q: A hot water heater in a residential home runs for an average of 2.5 hours per day with a heat energy…

A: Solution-Given thatAverage running hour of water heater per day (t)=2.5 hours=2.5×60×60 seconds=9000…

Q: True or False: According to the first law of thermodynamics, the internal energy of a system will…

A: The first law of thermodynamics states that the change in internal energy of a system equals the net…

Q: bring about a 7.7 J/K increase in the entropy

A: The amount of energy that would have to be transferred to a room temperature environment to bring…

Q: If energy is always conserved, never created or destroyed, then why do most of the machines in our…

A: SOlution: To explain If energy is always conserved, never created or destroyed, then why do most of…

Q: an automobile engine has a thermal efficiency of 48%. the temperature of the fuel is 350 C, and the…

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Q: Ex. 57: When 0.2 kcal of heat are supplied to a gas it expands by 2.1 litres against an external…

A: To find- (1) Work done (2) Increase in internal energy Given- dQ=0.2 kcal dV=2.1 litres=2.1 x 10-3…

Q: Direction: Identify at least 3 household chores that you do with an application of the 1st Law of…

A: Ist law of thermodynamics states that energy can neither be created nor be destroyed. It can only be…

Q: A hot water heater in a residential home runs for an average of 3.2 hours per day with a heat energy…

A: Given Data:- The number of hours per day that the heater runs: 3.2 h/day=3.2×3600 s/dayThe energy…

Q: A person can generate about 300 W of power on a treadmill. The treadmill is inclined at 2.80∘ and an…

A: Solution: Given Values, Total power output(P1) = 300 W mass (m) = 85 kg Theta = 2.8 degree Speed(v)…

Q: (1) The sum of all forms of mechanical energy of molecules in a thermodynamic system is called (a)…

A: The sum of kinetic energies and potential energies is called mechanical energies

Q: An engine has a hot reservoir that contains 20,000 J of heat energy at 3270 C, and a cold reservoir…

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Q: As a gasoline engine is running, an amount of gasoline containing 13,600 J of chemical potential…

A: Given: Input energy, E=13600 J Work done, W=3400 J