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Q1. If the activation energy for the vacancy formation is given as 0.77 eV for aluminium at (650 degrees Celcius) ^3, what would be the number of vacancies at 650 degrees Celsius? The atomic weight and the density of aluminium is 26.98 g/mol and 2.62 g/cm^3 in that order.

Q2. John pushes horizontally with an 80N force against a heavy desk, but the desk doesn't move. How much friction force acts horizontally between the desk and the floor?

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