After the capacitor is fully charged, you switch the switch to position b at time t = 0 seconds. The voltmeter initially reads 4.5 V. After how much elapsed time (in seconds) would you expect the voltmeter to read 1/2 its initial value?

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.)

An electron and a proton are held on an x axis, with the electron at x = + 1.000 m and the proton at x = - 1.000 m. part a how much work is required to bring an additional electron from infinity to the origin? express your answer with the appropriate units. part b if, instead of the second electron coming in from infinity, it is initially at x = + 20.00 m on the axis and is given an initial velocity of 100.0 m/s toward the origin, does it reach the origin? part c how close to the origin does it come?

Pearl labels a diagram of a charged capacitor as shown. which change would correct the error in the diagram? changing +2q to +q changing +2q to –2q reversing the direction of the arrows reversing the labels for conductors and insulator