Four 5 pico farad capacitor is connected to parallel. Each is charged with 3 volts potential difference.
a. Solve the equivalent capacitance
b. Solve the Total voltage

​(I hope the word problem can be solved because my modules will be passed soon).

Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.