A student living in a 3-m * 4-m * 4-m dormitory room turns on her 100-W fan before she leaves the room on a summer day, hoping that the room will be cooler when she comes back in the evening. Assuming all the doors and windows are tightly closed and disregarding any heat transfer through the walls and the windows, determine the temperature in the room when she comes back 8 h later. Use specific heat values at room temperature, and assume the room to be at 100 kPa and 20°C in the morning when she leaves.

Q: A 1.50-kg iron horseshoe initially at 600°C is dropped into a bucket containing 20.0 kg of water at…

A: From heat transfer equation,

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: A house has well-insulated walls. It contains a volume of 100 m3 of air at 300 K. (a) Calculate the…

A: Type of room is insulated  Volume of air: V = 100 m Temperature of room: T = 300 K Change in…

Q: A fire walker runs across a bed of hot coals without sustaining burns. In this problem, you may…

A: Temperature of the man , Tc = 37 °C Thickness of callus , dc = 2.9 mm = 2.9 x 10-3 m kc = kw = 0.08…

Q: Why is the following situation impossible? A group of campers arises at 8:30 a.m. and uses a solar…

A: The mass of the water can be obtained as The total energy required to boil the water can be…

Q: A system does 1.80×108 J of work while 7.50×108 J of heat transfer occurs to the environment. What…

A: Given :

Q: Liquid helium has a very low boiling point, 4.2 K, as well as a very low latent heat of…

A:

Q: During a bout with the flu an 80-kg person ran a fever of 39 oC. Consider that the specific heat of…

A: Final temperature to reach is fever temperature, Tf = 39o C Mass, m = 80 kg Specific heat, c = 3470…

Q: Consider a circular grill whose diameter is 0.3 m. The bottom of the grill is covered with hot coal…

A:

Q: What are the efficiencies of reversible heat engines operating between (a) the normal freezing and…

A: Given Data: (a) The freezing point of water is: TL=0°C=273 K The boiling point of water is:…

Q: An ideal, or Carnot, heat pump is used to heat a house to a temperature of 294 K (21 °C). How much…

A: Given:-          Out door temperature = 273 K         House temperature = 294 K

Q: A 670 kg meteorite made up of mostly aluminum, approaches the Earth. The initial temperature of the…

A: Given,  mass of the meteorite m=670 kg Initial temperature T1=-15 degree C initial velocity v=14…

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

A:

Q: A “solar cooker” consists of a curved reflecting mirror that focuses sunlight onto the object to be…

A: Formula to calculate the mass of the water is,

Q: A system does 1.95 × 108 J of work while 7.5 × 108 J of heat is transferred from the system to the…

A: Given data:  Work done by the system (W) = 1.95×108 J Heat transferred from the system to the…

Q: A rigid container that measures 3 ft3 is divided into two equal portions and separated by a thin…

A: The rigid container is divided into two equal portions.

Q: What is the maximum possible coeffcient of performance of a heat pump that brings energy from…

A: The relation between temperature in kelvin and the temperature in Celsius is: Convert the…

Q: *101. ao ssm An ideal, or Carnot, heat pump is used to heat a house to a temperature of 294 K (21…

A:

Q: Does the temperature of an ideal gas increase, decrease, or stay the same during (a) an isothermal…

A:

Q: Work of 2000 J is done on an ideal gas, but the internal energy increases by only 1700 J. What is…

A:

Q: A system does 1.80×108 J of work while 7.50×108J of heat transfer occurs to the environment. What is…

A: The work done by a given system is, The amount of heat transferred from the system to the…

Q: A food department is kept at 212°C by a refrigerator in an environment at 30°C. The total heat gain…

A:

Q: A 75-kg cross-country skier glides over snow as in Figure P11.33. The coefficient of friction…

A: Formula to calculate the work done against the friction is,

Q: A rectangular glass window pane on a house has a width of 1.2 m, a height of 1.9 m, and a thickness…

A: width = 1.2 m height = 1.9 m Area = 1.2 * 1.9 A = 2.28m2difference in temperature = 22-2  = 20…

Q: -8 A blacksmith is flattening a steel plate that measures 10 cm x 15 cm x 1 mm. He has heated the…

A:

Q: A 1.50-kg iron horseshoe initially at 650°C is dropped into a bucket containing 24.0 kg of water at…

A:

Q: In a closed system, volume changes from 1.5m³ to 7.5m³ and heat addition is 200kJ. Calculate the…

A:

Q: A submarine holds 975 kg of dry air at 29.9 °C. While docking for resupply, the hatch is opened,…

A: Given data: mass of cool air, mcool = 66 kg mass of dry air, mdry = 975 kg the temperature  of cool…

Q: A fixed mass of an ideal gas is heated from 50 to 80°C (a) at constant volume and (b) at constant…

A:

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: A plate (74 + 0.3) m long and (74 + 0.1) m wide, with a thickness of (74 + 12) mm is made from…

A:

Q: A well-insulated electric oven is being heated through its heating element. If the entire oven,…

A:

Q: Air at 6.9 bar, 260 °C is throttled to 5.5 bar before expanding through a nozzle to a pressure of…

A: we know that, by first law of thermodynamics h=CPT Here, we have T1=T2 = 2600 C  or T=273+260 = 533…

Q: A copper wheel rubs against a copper plate in such a manner that there is a 47.0 N force of kinetic…

A: (a) given that forceof Kinetic friction;Fk=47 Nrelative spped netween the surfaces; V=41 m/srate at…

Q: Consider a surface at -5ºC in an environment at 25ºC. The maximum rate of heat that can be emitted…

A:

Q: Following a collision between a large spacecraft and an asteroid, a copper disk of radius 28.0 m and…

A: Given data: Initial radius of disk is,R0=28 m. Thickness of disk is, t=1.20 m. Initial temperature…

Q: There is a small high-orbit satellite in space that is generating a lot of waste heat (at the rate…

A: The heat transferred to the deep space is calculated by using the formula q=εσAT4 , where ε=0.99 is…

Q: On a hot summer day, a student turns his fan on when he leaves his room in the morning. When he…

A: Given:  Hot summer day

Q: Consider a 10.0 kg iron box holding 48.0 kg of solid ice. Initially, both the box and the ice are at…

A: When heat energy is supplied to or absorbed from an object , according to the law of conservation of…

Q: A thermally isolated system is made up of a hot piece of aluminum and a cold piece of copper, with…

A: C is correct option. Neither, both experience same size gain or loss of heat

Q: Following a collision between a large spacecraft and an asteroid, a copper disk of radius 28.0 m and…

A: Given: The radius of the disk is r = 28 m, The thickness of the disk is t = 1.20 m The angular speed…

Q: Can you warm a kitchen in winter by leaving the ovendoor open? Can you cool the kitchen on a hot…

A: The First Law of Thermodynamics states that the heat transferred between a source of higher…

Calorimetry

Measuring the heat transferred during chemical reactions or other physical processes is known as calorimetry. It comes under the branch of thermochemistry.