4. Find the current through and the potential drop (voltage) across each resistor in the diagram below. The resistance of each resistor is in ohms ( ), and the battery provides 12.0 V of electric potential. [6 marks] MA 15 120V 5. What is the equivalent resistance of the resistor network below? [5 marks] 42 0 A 630 2102 84 0 105 0 (a) 6. Classify the following examples as transverse, longitu-haulonal vibrations.[8 marks] (a) A ball attached to a spring is bouncing up and down. (b) An agitator moves in an upright washing machine. (c) A child swings on a swing. (d) A child sits on a swing with the ropes twisted, so the child is spinning as the ropes are unwinding. 7. The world record for pogo jumping is 122 000 times in 15 h 26 min. [6 marks] (a) What type of vibration is occurring in the spring of the pogo stick? (b) Calculate the average period of vibration. (c) Calculate the average frequency of vibration