5.0 kg block has an acceleration of 0.20 m/s2 when a force is exerted on it. A second block has an acceleration of 0.10 m/s2 when the same force acts on it. Determine the mass of the second block.

Adielectric-filled parallel-plate capacitor has plate area a = 30.0 cm2 , plate separation d = 9.00 mm and dielectric constant k = 3.00. the capacitor is connected to a battery that creates a constant voltage v = 15.0 v . throughout the problem, use ϵ0 = 8.85x10-12 c2/n. m2 . find the energy u1 of the dielectric-filled capacitor.