9. What is the advantage of solving vector problems using vector components, rather than using the graphical method? (5 marks) 10. Why are the components of a vector usually chosen to be in mutually perpendicular directions? (5 marks) 11. Briey explain the following situations by referring to any of Newton's laws. (a) Posts and overhead rails are provided on buses for standing passengers to hold. (5 marks) (b) It takes longer to accelerate a truck than a car from 0 to 100 knu'h. (5 marks) 12. Describe one form of alternative energy. Detail the process of how that energy source is used to generate electricity, what are three pros and cons attached to that energy type. Also, would you support the use of that energy source with supporting justifications as to why you would use that energy source. (10 marks) 5. You want to connect a cassette player to your 12 V car battery. You know that the player uses four 1 5 V B cells connected in series. It also says on the back of the player that it requires 2.0 A of current. Calculate the value of the resistor that must be placed in series with the player in order for it to receive the correct voltage. (4 marks) 6. A refrigerator compressor draws 2.0 A from a 120 V source and operates, on average, 30 mjnfh. What is the approximate hourly cost of operation of the refrigerator if the cost of electrical energy is $0.03sWh'? (4 marks)