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.

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Q: luid Mechanics A solid spherical ball has a radius of 50 cm and total mass of 400 kg. If it’s drop…

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Q: In the Figure below, a ball of material A is suspended in hydrostatic equilibrium at a depth of H…

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Q: What is the weight of this tank subjected to standard gravitational acceleration?

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Q: The figure belows shows an object whose mass is 25 lb attached to a rope wound around a pulley. The…

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Q: A tank has two rooms separated by a membrane. Room A has 1 kg of air and a volume of 0.5 m^3; room B…

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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…

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

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Q: How much force is needed to pull a spring with a spring constant of 40 N/m a distance of 35 cm?

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Q: For a vibrating system, m 20 kg,k=4,000N/m and c=70 N.s/m . A harmonic force of amplitude 200 N and…

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Q: ww. m k k (a) m k k (b) k, k, wWw. k2 k2 (c) FIGURE P1.41

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Q: 1. A car moving at 70 km/hr has a mass of 1700 kg. What force is necessary to decelerate it at a…

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Q: In à spring, mass vibrating system, the natural frequency of vibration is 3.56 Hz. When the amount…

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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.