Series rlc circuit (l = 340 ×10-3 h, c = 25 ×10-6 f, and r = 280 ohms) has an ac generator with amplitude εmax = 120 v and unknown frequency f. at time t = 0, the following voltages are measured: vad = va - vd = + 120 v, vbc = vb - vc = -10.1 v, and vcd = vc - vd = + 60.6 v. what is timax, the first time after t = 0 that the current in the circuit attains its maximum value? timax =

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by

The average density of the planet uranus is 1.27 103 kg/m3. the ratio of the mass of neptune to that of uranus is 1.19. the ratio of the radius of neptune to that of uranus is 0.969. find the average density of neptune.

9.98 kg of r-134a at 300 kpa fills a rigid container whose volume is 14 l. determine the temperature and total enthalpy in the container. the container is now heated until the pressure is 600 kpa. determine the temperature and total enthalpy when the heating is completed. use data from the steam tables.