A parallel-plate capacitor of capacitance 20 µF is fully charged by a
battery of 24 V. The battery is then disconnected. A dielectric slab of k = 4
is slipped between the two plates of the capacitor:
(a) Find the change in the potential energy of the capacitor.
(b) Does the potential energy increase or decrease? Explain

When an object is heated it contracts. a. true b. false

Several mountains together form a mountain . a few of these combined form a mountain system. several systems combined form a mountain , which can stretch thousands of miles in length.

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)