12. During a race, a runner runs at a speed of 6 m/s. 2 seconds later, she is ru
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12. During a race, a runner runs at a speed of 6 m/s. 2 seconds later, she is running at a speed of 10 m/s. What is the runner's acceleration? Show your work. 13. Look at the graph below measuring the speed of a truck and answer the following 2 questions a) If the graph represents speed, what is measured on the x and y axes? You need to specifically identify which axis is which. b) Based on what the y axis measures, explain the motion of the truck represented by the graph from point 2 to 6. Speed 25 20 15t 10 0 14. If you push a 900N refrigerator with the same force as you lift a 40N dumbbell, the dumbbell will move faster. According to Chapter 12, which of Newton's laws is this an example of? Explain how you know 15. How does the strength of an electromagnet depend on the current and the number of turns in the coil? mc applies. 16. Identify two types of nuclear reactions in which the equation E Copyrigha O 015 by James Madison High School, Norcross GAExplanation / Answer
12) a = (v2 - v1) / t = (10 - 6) / 2 = 2 m/s^2
13) a) x axis = Time , y axis = Distance
b) The truck is not moving.
14) Newton’s third law because an object had large momentum if the product of its mass and its velocity is large
15) Strength of Electromagnet increases when either the "Current" or "Number of turns in a coil" increases. They are directly proportional to strength of electromagnet.
16) Fission and fusion
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