The brakes in a car increase in temperature by ΔT when bringing the car to rest from a speed v . How much greater would ΔT be if the car initially had twice the speed? You may assume the car to stop sufficiently fast so that no heat transfers out of the brakes.

Q: A 20,000 kgkg subway train initially traveling at 18.5 m/sm/s slows to a stop in a station and then…

A: In this question we have to find the rise in temperature. Please give positive feedback if the…

Q: 2) A hot bar of lead with Ti Pb, Mpb = .6 kg, is dropped into an iron pot (mFe = .3 kg) that has…

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Q: Eg 5 An ideal gas absorbs a certain amount of heat from the outside: [ D] (A) The temperature must…

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Q: Lake Erie contains roughly 4.00 x 1011 m3 of water. (a) How much energy is required to raise the…

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Q: When 1.0 kg of ethanol at 25°C changes from the liquid to the gas phase at atmospheric pressure. The…

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Q: A steam engine operation between 150 C and 550 C. What is the theoretical maximum thermal…

A: Given value--- low temperature = 150 degree C.  higher temperature = 550 degree C.  We have to…

Q: a. 1 kg of water at 70 oC is poured into a 1 kg copper cup initially at 20 oC. The specific heat of…

A: (a)   From the heat equilibrium condition, the equilibrium temperature can be determined as follows.…

Q: In an insulated container, you combine hot metal with ice. The ice starts at -20 degrees C. The…

A: Obtain the specific heat of ice. Obtain the specific heat of the water. Obtain the latent heat of…

Q: Answer all parts.

A: 11. (c) Yes but you can only determine whether the person's body temperature is higher or lower than…

Q: 8. The table below shows data from a heating experiment involving four substances of each of mass…

A: The answer is given below

Q: A thermopane window consists of two glass panes, each 0.50 cm thick, with a 1.0-cm-thick sealed…

A: Given data: Thickness of the glass pane is, d= 0.50 cm= 0.0050 m Thickness of the air between sealed…

Q: It is important for the body to be able to cool itself even during moderate exercise. Suppose a 70kg…

A: Mass of the person , m = 70kg Total time on treadmill, t = 30 min =1800sec Metabolic energy…

Q: A 100 kg steel support rod in a building has a length of 2.0 m at a temperature of 200C. The rod…

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Q: A leaf of area 40 cm2 and mass 4.5x10-4kg  directly faces the Sun on a clear day. The leaf has an…

A: Given: The area of leaf = 40 cm2, the mass of leaf = 4.5x10-4kg, leaf has an emissivity = 0.85…

Q: Which of the following statements is FALSE regarding a substance undergoing a phase change? O The…

A: Given, statements about a substance undergoing phase change

Q: A 0.2-kg aluminum plate, initially at 20°C, slides down a 15-m-long surface, inclined at a 30 degree…

A: Given Information: The mass of the aluminum (m) = 0.2 kg The initial temperature of the aluminium…

Q: A piece of iron block moves across a rough horizontal surface before coming to rest. The mass of the…

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Q: A car weighing 1.30×10^3 kg reduces its speed with strong braking from 130 km/h to 90.0 km/h. By how…

A: SOlution: Given that M = 1.3 x103  kg V1 = 130 km/h v2 = 90 km/h m = 6 kg C = 450 J/kgK

Q: When 1.0 kg of ethanol at 25°C changes from the liquid to the gas phase at atmospheric pressure. The…

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Q: If a gas system of one to two volumes expands under constant pressure at the same time, then 100J of…

A: Given, Heat lost to ocean, Q=-100 J Volume expansion, V to 2V

Q: A 2.75-g copper coin at 20.0°C drops 60.0 m to the ground. (a) Assuming 55.0% of the change in…

A: (a)Consider a copper coin of mass m is at initial temperature Ti and at height h from the ground…

Q: The average person produces heat at the rate of about 120 W when at rest. At what rate must water…

A: Given: For water Latent Heat of Vaporization (Lv) = 2430 kJ/kg or 2430 J/g Heat produce rate (H) =…

Q: i) When two objects are in then heat flows out from hot to cold. During this process the internal…

A: (i) When two objects are in contact then heat flows from hot to cold. During this process the…

Q: Which of the following is NOT TRUE about the Newton's Law of Cooling? O It states that the rate of…

A: Answer :- option c is incorrect Explanation - : The loss of heat from the body should be by…

Q: On a winter day, you turn on your furnace and the temperature of the air inside your home increases.…

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Q: On a windy day, a camper feels colder as compared to a day at the same temperature when there is no…

A: We need to comment on the major mechanism of heat transfer in the situation described in the…

Q: A. Before going in for an annual physical, a 70.0-kg person whose body temperature is 37.0∘C…

A: a)According to energy conservation law, heat energy lost by the person is equal to the heat energy…

Q: A hermetically sealed room 4 m x 4 m x 4 m has an internal sensible heat gain of 3 kW. The overall…

A: The  heat loss can be determined by, Q=h×A×T0-Ts

Q: A large room in a house holds 947 kg of dry air at 33.2°C. A woman opens a window briefly and a cool…

A: Solution:   Given Values, Mass of dry air (m1)=947 Kgtemperature (t1)=33.20 CMass of added air…

Q: Newton's Law of Cooling says that the rate at which a body cools is proportional to the difference…

A: The equation F(t) =T +Cekt will help us to solve the problem F(t) = temperature of the body. T =…

Q: A 2.7 kg lump of aluminum is heated to 92°C and then dropped into 12.0 kg of water at 5.2°C.…

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Q: A thermodynamical system performs work and at the time exchanges energy to the outside environment…

A: First law of thermodynamics: The way of expressing the first law of thermodynamics is that any…

Q: When 1.0 kg of ethanol at 25°C changes from the liquid to the gas phase at atmospheric pressure. The…

A: mass of ethanol = 1000 g latent heat of vaporization, L=838 J/g

Q: A room is initially at the outdoor temperature of 25°C. Now a large fan that consumes 200 W of…

A: Given that heat transfer is governed byQ=UATi-Towhere U: overall heat transfer coefficient…

Q: An automobile has a mass of 1 500 kg, and its aluminum brakes have an overall mass of 6.00 kg. (a)…

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Q: A2.9 kg lump of aluminum is heated to 95°C and then dropped into 10.0 kg of water at 5.0°C. Assuming…

A: When two or more than two bodies of different temperatures are placed in physical contact with each…

Q: QUESTION 4 In an isolated system, a 0.255 kg block of gold at 85.0 °C is fully immersed in 0.155 kg…

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Q: Problem 10: You read in a popular diet blog that the author claims you can lose up to half a pound…

A: First we have to calculate the heat required to melt ice and to make water warm up to 37 degree…

Q: When perspiration on the human body absorbs heat, some of the perspiration turns into water  vapor.…

A: GivenThe latent heat of vaporization for water molecules=2.42×106 J/Kg

Q: Which of the following is NOT TRUE about the Newton's Law of Cooling? O It describes the rate at…

A: let the initial temperature of an object = T Let the final temperature of the object = T' Let the…

Q: Consider two identical pans containing the same amount of water that have been heated to different…

A: Both the pans will lose heat to the surroundings as the heat always flows from a higher temperature…

Q: A 2.6 kg lump of aluminum is heated to 96°C and then dropped into 11.0 kg of water at 5.4°C.…

A: The heat lost will be equal to the heat gain. Here, mAl is the mass of aluminum, cAl is the…

Q: A student living in a 4m x 6m x 6m dormitory room turns on her 150-W fan before he leaves the room…

A: The data given is as follows, 1. Volume of the room=4m×6m×4m=144 m3 2. Power of the fan, PW=150 W 3.…

Q: Which of the following is NOT TRUE about the Newton's Law of Cooling? O It states that the rate of…

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Q: Problem 2: 0.4 kg of ice at – 10°C are mixed with 0.2 kg of water at 50°C. The water and ice are…

A:

First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.