Three resistors, three capacitors, a battery, and two switches are connected in the circuit shown below. The values of all circuit elements are given in the figure. Originally, the switches S1 and S2 are open and all of the capacitors are uncharged. At time t = 0, both switches are closed. V8= 18V R1=5ohm C1=10muF R2=10ohm C2=20muF R3=15ohm C3=30muF (a) What is the current, I1, through resistor R1 immediately after the switches are closed? (b) What is the charge, Q2, on capacitor C2 a very long time after the switches are closed? (c) What is the energy, U3, stored in the capacitor C3 a very long time after the switches are closed? (d) After a very long time with both switches in the closed position, switch S2 is reopened. How long, t1/e, does it take for the charge on capacitor C2 to drop to 1/e (36.8%) of its fully-charged value (i. e. of the value it had just before S2 was reopened)?

1. what is the relationship between wavelength and the penetrating power of an electromagnetic wave? a) the penetrating power has no relationship to the wavelength. b) the penetrating power increases as the wavelength increases. c) the penetrating power decreases as the wavelength increases. d) the penetrating power decreases as the wavelength decreases. 2. as ice melts and turns into water, the speed of sound through the material would most likely do what? justify your answer. a) the speed would not change because the material is always water. b) the speed of sound would increase because the density of water is less than that of ice. c) the speed of sound would increase because energy is added to ice in order to make it melt. d) the speed of sound would decrease because sound travels faster through solids than liquids. 3.which of these waves need a medium to travel through? a) sound b) x-rays c) infrared rays d) visible light