Molecular Physics | Thermodynamics Answers

An insulated tank initially contains 0.25 kg of a gas with an internal energy of 200 KJ/kg. Additional gas with an internal energy of 300 KJ/kg and an enthalpy of 400 KJ/kg enters the tank until the total mass of the gas contained is 1 kg. The final internal energy (in KJ/kg) of the gas in the tank is ?
a) 250
b) 275
c) 350
d) None of these

Please provide explaination to answer

Q.1 choose correct option
a) Only heat can cross the boundary of control surface.
b) Heat and Work can cross the boundary of control surface.
c) Mass as well as heat and work can cross the boundary of control surface.
d) None of these.

The height of a water fall is 40 meter.Assuming adiabatic conditions,estimate temperature difference between top and bottom.

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B). Evaporation

Define the term mechanical equivalent of heat. How is it different or similar to mechanical work?

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Precisely one million molecules strikes a surface with an area of 1.00×10^-2 m^2 in one second and bounce elastically. each of these molecules strike at an angle of 60° from normal, each has a mass of 3.30×10^-27 kg, and the average speed of these million molecules is 330 m/s. i) what is the magnitude of total momentum of the molecules before they strike the surface? How large is its component perpendicular to the surface? ii) what average pressure do these molecules exert on this surface during the one second they are striking it?