Consider the steady-state model of the universe. In this model, the universe is made up of matter and is expanding at a constant rate, H0. Its matter density, ρm, also remains constant due to the creation of matter. Assume that H0 = 70 km/s/Mpc and assume that  Calculate what is the rate of creation of matter over time per unit volume, M / V , so that the density remain constant.

Q: Energy transformation from one form to another can occur O through the system boundaries inside the…

A: Energy can be transferred to or from a system as heat and/or work. The energy is conserved for…

Q: 290 J of energy is transferred to a system consisting of 2.0 moles of an ideal gas. If the volume of…

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Q: A cryogenic substance is found to have a specific heat capacity (at constant volume) c_v that varies…

A: GivenCV=AT2whereA is constant in J/k3kgQ=220Jm=8750 mg=8750×10-3 g=8.750 g=8.750×10-3 kgT1=1KT2=6.6…

Q: Consider an experimental structure required to always have constant pressure. For this purpose, a…

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Q: In the movie Back to the Future, Marty travels back in time to 1955. In 1955, the only available…

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Q: he system to the surroundir cific internal energy of the s in kJ/kg. Neglect changes

A: The heat transferred is Q=1000 kJ.The work done on the system is W=200 kJ.The mass of the system is…

Q: 2.7 A simple 1-DOF mechanical system is presented in Fig. P2.7. Displacement z is measured from the…

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Q: Which of the objects would be accelerating the fastest? 20 N A 25 N 20 N 25 N 15 N B 25 N 20 N 25 N…

A: To determine which object accelerates faster, we need to calculate the net force acting on each…

Q: A velocity distribution is given as V = —-—- bxÔ¸ —-—- byô, s given as V = -—-bxô, ——-byô, + bz8³,…

A: Given: V=-12bxδx-12byδy+bzδz To find: Work flux

Q: For the following system, obtain the mathematical model (Hint: Use superposition principle and…

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Q: An electric heater producing 260 W of heat is used to warm up a room containing 7 m3 of air. If we…

A: Given data: The power producing by heater is P=260 W The volume of the air in the room is V=7 m3 The…

Q: A mass of 20 kg is suspended from a spring of stiffness 10,000 N/m. The vertical motion of the mass…

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Q: A basketball player drops a 0.5 kg basketball vertically so that it is traveling at 5.0 m/s when it…

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Q: 1. As seen in Fig P1.2 from the textbook, water circulates through household piping to be used by…

A: The given devices are : water heater dishwasher shower water meter

Q: =) The piston of a cylinder-piston device has a mass of 72 kg and a cro cross- sectional area of…

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Q: Assuming all the value that need for the to find these questions: can pick any value to be able to…

A: Given: To find: A) initial potential energy of the system  B) Kinetic energy at the instant of…

Q: Tesla Model 3 electrical car weights about 1800 kg. Initially at rest, it accelerates to 60 mph…

A: Given:  Car weight (m) = 1800 kg Initially car is at rest, u = 0 accelerates (a) = 60 miles per hour…

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.