kseniyayakimov

13.09.2019 • 

Chemistry

The development of safe nuclear fuel pellets is critical to future reactor designs. one project the engineers have is to look into what happens when the reactor cooling system fails and the heat transfer mechanism changes from forced convective cooling of the pellets to free con vective cooling (coefficient-h) the reactor cooling fluid is essentially infinite in extent and remains at a uniform temperature of t the pellet generates heat at a rate that varies with the pellet temperature: q* = q(t-t)w/m3 k =50 w/m k p 1500 kg/m3 c 450 j/kg k t, 20°c h55 w/m2 k t, = 125°c - q0= 55,000 w/m3 k peller= 4 mm assuming the lumped capacitance approach is appropriate, derive the transient differ- ential heat balance and solve the resulting differential equation (pellet temperature at t 0 is t)

Ответ:

shelbylynn17

11.08.2021

Chemistry

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Newton’s universal law of gravitation states that all objects attract each other with a force -directly- proportional to the product of their masses and -inversely- proportional to the square of the distance between their centers. When considering objects on the surface of the Earth, the force is -away from directly-proportional to the product of the mass of the object and the -acceleration- due to -gravity-at the Earth’s surface. Since the Earth is -larger- than ant object under consideration, the object is drawn -toward- the Earth.

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