QUESTION 9 The flow of electrons in an electric circuit move by a) bumping other electrons b) colliding with molecules c) interacting with an established electric field d) none of the above OA OB OC OD QUESTION 10 The current through two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resistance of a single light bulb is a) 22 ohms b) 44 ohms c) 220 ohms d) 440 ohms. e) none of the above O A O B OC OD OEQUESTION 12 An object is 2 m in front of a plane mirror. Its image is a. Virtual, inverted, and 2 m behind the mirror b. Virtual, inverted, and 2 m in front of the mirror c. Virtual, upright, and 2 m in front of the mirror d. Virtual, upright, and 2 m behind the mirror e. none of the above O A O B OC OD OE QUESTION 13 . Which of the Newton's laws allows spaceship to accelerate by burning rocket fuel? a] First b) second c) third d) First and second el none of the above O A O B OC OD OEWhen Danny Diver who weighs 500 N steps off a diving board 10 m above the water, he hits the water with a velocity of in m/'s A) 4.5 B) 14 C) 20 D) 200 E) none of these O A O B OC OD OE QUESTION 20 A beam of protons and a beam of neutrons of the same energy are both harmful to living tissue. The beam of neutrons, however, is less harmful. Why? a) Neutrons are much smaller and lighter than protons and would do less damage b) Neutrons travel at reduced speed compared to the speed at which protons travel c) Neutrons carry no electric charge and thus have a greater likelihood of passing through the tissue d) All of the above are reasons why neutrons are less harmful O A O B OC OD QUESTION 21 What is the main technical difficulty in dealing with fusion reactions? a) The amount of energy needed to overcome the electrical repulsion of the reactants is extremely high. b) The reactants are highly toxic and extremely radioactive. c) The mass of the reactants is less than the mass of the products. d) It isn't possible to artificially generate the conditions needed for fusion. e) none of the above