A parallel-plate capacitor has a capacitance of c1 = 5.5 μF when filled with air and c2 = 25 μF when filled with a dielectric oil at potential difference of 12 V. Take the vacuum permittivity to be εo = 8.85 × 10-12 C2/(N⋅m2).

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Photoelectrons with a maximum speed of 6.50 x 107 m/s are ejected from a surface in the presence of light with a frequency of 6.75 x 1014hz. if the mass of an electron is 9.10 x 10-31 kg, calculate in joules the maximum kinetic energy of a single electron. 3.84 x 10-15 j 1.92 x 10-15 j 5.92 x 10-23 j 3.07 x 10-16 j

Question part points submissions used suppose that 2 j of work is needed to stretch a spring from its natural length of 26 cm to a length of 36 cm. (a) how much work is needed to stretch the spring from 28 cm to 32 cm? (round your answer to two decimal places.)