g Activity 1: The equation y=√(a^2-x^2 ) ,-a≤x≤a, is the upper half of the circle centered at the origin with radius of a. Rotate this curve about the x-axis generate the sphere centered at the origin with radius equals to a. Use the disk method to show that:

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

the answer is c)8

step-by-step explanaction:

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step-by-step explanation: