The fins attached to a surface are determined to have an effectiveness of 0.9. Do you think the rate of heat transfer from the surface has increased or decreased as a result of the addition of these fins?

Q: On a cold day, a heat pump absorbs heat from the outside air at -10°C and transfers it into a home…

A: Given  Outside temperature TL=-100 C=273-10=263K Home temperature TH=300 C=273+30=303K

Q: A vessel that contains water is moved by paddles that have falling masses. This agitation warms the…

A:

Q: In a vacuum, heat can be transferred by: a) conduction and convection b) convection and radiation c)…

A: In a vacuum, heat can be transferred by:a) conduction and convectionb) convection and radiationc)…

Q: Calculate the rate of steady heat transfer from a 8 m-by-10 m roof of a building during a cold…

A:

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

A: The mass of the block, m = 2.8 kg The initial velocity of the block, v = 2.0 m/s The specific heat…

Q: A wall in a house contains a single window. The window consists of a single pane of glass whose area…

A: The formula for the rate of heat transfer in terms of thermal conductivity is: The thermal…

Q: During a marathon race David uses energy at a rate of 272 W. What volume of body fluid does he lose…

A:

Q: A wall in a house contains a single window. The window consists of a single pane of whose area is…

A:

Q: What is the change in internal energy of a system that takes in 2.83 106 J of heat, and does 4.50…

A: Given that  Work done by the system (W) = 4.50×105J Heat transfer into the system is (Q1) = 2.83…

Q: If a system has 4×102 kcal of work done to it and releases 5×102 kJ of heat into its surroundings,…

A:

Q: Suppose you stand with one foot on ceramic (k=34 W/mK) flooring and one foot on a wool carpet (k…

A: Given that, the value of K of ceramic and K of wool carpet an area of contact and temperature of…

Q: How much heat transfer occurs from a system, if its internal energy decreased by 50 J while it was…

A: given that,Internal energy decreased:∆U=- 50 Jwork done:∆W=120 J

Q: A body with mass of 1 kg slides downwards on an inclined plane of height equals 2 m. The angle of…

A:

Q: Which sample of water has the most thermal energy? O A. A 0.5 kg sample at 1°C O B. A 1.5 kg sample…

A: Heat depends on the mass, specific heat and temperature.

Q: In a calorimetry experiment, two liquid substances X and Y with the same mass are placed in separate…

A:

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: In exercising, a weight lifter loses 0.148 kg of water through evaporation, the heat required to…

A: The mass of weight lifter loses of water through evaporation,

Q: A hole in a brass plate has a diameter of 1.20 cm at 20°C. What is the diameter of the hole when the…

A: Given that                    The coefficient of linear thermal expression for a brass is =…

Q: When thermal energy is removed from a system, what happens to the average kinetic energy of the…

A: The average kinetic energy of system is directly proportional to temperature. Temperature of an…

Q: Object 1 has nine times the specific heat capacity and four times the mass of Object 2. The two…

A: Vv

Q: TH Ta 4.00cm 3.00cm 2.20m A rectangular bar of gold has the dimensions as shown. (This is a very…

A: length of gold bar, l= 2.2 m cross-section area , A= (3 cm)x(4 cm)=12 cm2 = 12 x(10-2 m )2 = 12 x…

Q: A wall in a house contains a single window. The window consists of a single pane of glass whose area…

A:

Q: An unused wood-burning stove has a constant temperature of 18 °C (291 K), which is also the…

A:

Q: A wall in a house contains a single window. The window consists of a single pane of glass whose area…

A:

Q: What is the change in internal energy of a system which does 4.50×105J of work while 3.00×106 J of…

A: The change in internal energy(ΔU) of a system.given,workdone(W)=4.50×105 J Heat goes…

Q: What is the change in internal energy of a system which does 4.50×105 J of work while 3.00×106 J of…

A: The heat transfer in this case is

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: Brickwork is to be incorporated into the interior of a house to act as a heat absorber.  Each brick…

A: The mass of 100 gal of water is, M = 1(378.5) = 378.5kg The total heat capacity of 100 gal or 378.5…

Q: Two walls are made of the same type of concrete and have the same temperature difference between…

A: No. of walls = 2  type of concrete = same  temp. differnce is same in both inside and outside of…

Q: Calculate the change in internal energy when 5g of air is heated from 0 degree C to 2 degree C , the…

A: Given:  m = 5 g  T = 0 C  T' = 2 C  c = 0.172 cal/g C

Q: On a cold day, a heat pump absorbs heat from the outside air at -10°C and transfers it into a home…

A: Given value--- cold temperatures = - 10 degree C. Hot temperatures = 30 degree C. We have to…

Q: You are asked to design a heating system for a swimming pool that is 2 m deep, 25 m long, and 25 m…

A:

Q: One face of an aluminium cube of edge 2 meters is maintained at 100ºC and the other end is…

A: Given : Thermal Conductivity (K) = 209 W/m ºC Area of cube = (2 x 2) m2 = 4 m2 Time(t) = 5 seconds…

Q: What is the correct formula for obtaining heat when the temperature of an object changes?

A: The perception experienced when energy transfer from high temperature area to a low temperature area…

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: During a process, the internal energy of a system increases by 16 Kj, at the same time it performs a…

A: According to the first law of thermodynamics,  dQ = dU + dW  where, dQ is the heat supplied, dU is…

Q: Heat can be transferred through a vacuum by which one or more of the following? conduction…

A: Given: Heat can be transferred through a vacuum by which one or more of the following methods.…

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

A:

Q: Emission of heat by radiation is directly proportional to the temperature of the source. O a. True O…

A: True, Heat emission through radiation mode is dependent on source temperature.

Q: Two isolated systems with different temperatures are connected via long metal rod . The metal rod…

A:

Q: The specific heat capacity of water is extremely high. If it were much lower, say, one-fifth as…

A:

Q: What is the change in internal energy of a system which does 6.5×105 J of work while 3.00×106 J of…

A:

Q: Suppose same amounts of heat transfer (Q) into different masses of copper and water, causing same…

A: Heat transfer to copper and water are the same

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.