Question

An object travels a distance of 40km with avg speed of 80km/h and then next 40km with avg speed of 40km/h. Find the avg speed with the total distance.

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Answer 1

Answer:

Total distance =40 km+40 km=80 km

total time = (40/80 + 40/40)h = 3/2 h

Averag speed = total distance /total tim

= 80 Km*2/3 h = 160k/3 h = 53.33km/h

Average speed = 53.33 km/h

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Step-by-step explanation:

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Answer 2

Answer:

Obtain the expressions for the Fermi energy, the total energy and density of states for a free electron gas in one dimensional. How does Fermi energy of a metal depend on temperature, concentration of electron and total number of electrons present in metal? Show the variation of DOS with energy. The atomic radius of sodium atom is 1.64Å. Determine the Fermi energy of sodium at 0K.

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