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For multiple-choice questions, circle the letter of the one best answer (unless more than one answer is asked for). Show your work on free-response questions. Be sure to use proper units and significant figures in your final answers. Organization and neatness count, too. Do NOT use red inkplease reserve that color for grading. 1. a. (4 pts.) Calculate the strength (magnitude) of the repulsive electric force between two protons next to each other in a helium nucleus, with a separation of 1.7 x 10-15 m between their centers. (Note: This is not the actual distance, but t is the correct order-of-magnitude.) Show your work. b. (3 pts.) In the absence of any other forces, what would be the magnitude of the instantaneous acceleration of one of the two protons ifit were released? Show your work.c. (2 pts.) If one of the two protons were released from rest at t=0 (as described in part (b)) and allowed to fly freely through space, qualitatively graph the magnitudes of its acceleration vs. time and speed vs. time on the provided axes: (Consider only the repulsive electric force between these two protons; ignore any other forces.) d. (1 pt.) What is the name of the force that prevents all of the protons inside every atomic nucleus from just flying apart due to this huge electric repulsion? (Hint: Remember the Four Fundamental Forces of nature from PHYS 151?) Name it:

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