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In the simple circuit shown. the current / through the resistor R is 5.12 x 10"- A. The value of the resistor is 150 2. (a) How many electrons pass through the resistor R every second? (b) What is the value of the voltage source !'? W 7. A solid. rectangular lead bar at 20 C has the dimensions shown in the diagram. The resistivity of lead at 20'C is 22 x 10-$ 52.m. 20 cm Find the resistance between the pair of opposing faces (20 cm by 30 cm). -900 cm 30 cm 8. A fixed quantity of an ideal gas has a pressure. volume, and temperature given by P1. \\'1. and 71. respectively. If the gas has its volume tripled and its temperature doubled. find its final pressure in terms of P,. y. Find the heat energy required to raise the temperature of a 2000-g ice block from -5.00 C to steam al 120-C. Useful numbers: Specific heat of ice = 2050 J/(kg-C') Specific heat of water = 4186 J/(kg C") Specific heat of steam = 2009 J/(kg.C') Heat of fusion of water = 334 x 10' J/kg Heat of vaporization of water = 2256 x 10' J/g 1 10. " Kirk saw the space shuttle take off from its launch pad. He heard the ignition blast 15 seconds later. The frequency of the sound wave produced by the engine blast was 2000 Hz. Assume the speed of sound on that day was 340 meters per second. (a) Find the distance in kilometers that Kirk was from the launch pad. (b) What was the wavelength in meiers of the sound wave produced by the engine blast