3. PROBLEM #19 (page 587) WELL VIAV LILY DICK Call Carry: 29 19. BIO A person notices a mild shock if the current along a path through the thumb and index finger exceeds 80. MA. Compare the maximum possible voltage without shock across the thumb and index finger with a dry-skin resistance of 4.0 X 105 0 and a wet-skin resistance of 2.0 ko. 4. PROBLEM #25 (page 587) TODISLIVILY 25. At 20.0 C, the carbon resistor in an electric circuit connected to a 5.0-V battery has a resistance of 2.0 X 10 0. What is the current in the circuit when the temperature of the carbon rises to 80.0 C? on non5. PROBLEM #32 (page 587) 32. A platinum resistance thermometer has resistances of 200.0 0 when placed in a 0'C ice bath and 253.8 0 when immersed in a crucible containing melting potassium. What is the melt- ing point of potassium? Hint: First determine the resistance of the platinum resistance thermometer at room tempera- ture, 20.0 C. 6. PROBLEM #51 (page 588) Additional Problems 51. Consider an aluminum wire of diameter 0.600 mm and length 15.0 m. The resistivity of aluminum at 20.0 C is 2.82 X 1028 0 . m. (a) Find the resistance of this wire at 20.0 C. (b) If a 9.00-V battery is connected across the ends of the wire, find the cur- rent in the wire.