7. Milo's electric sewing machine has a power setting of 750W. The sewing machine increases the kinetic energy store of the needle using the electrical pathway. During a 5 minute sewing session, how much as the kinetic energy store of the needle increased by? (assume 100% efficiency)​

Describe how the fermi level changes with donor level, temperature and contact with p and n type semiconductors

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Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?