QUESTION 12 In a classroom demonstration, a 73.5-kg physics professor lies on a "bed of nails." The bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board so that the points extend vertically outward from the board. While the professor is lying down, approximately 1900 nails make contact with his body. What is the average force (in N) exerted by each nail on the professor's body? QUESTION 13 The binding energy of an isotope of chlorine is 298 MeV. What is the mass defect of this chlorine nucleus in atomic mass units (u)? QUESTION NG 207 Pb has a mass of 3.4368- 1025 kg What is the approximate density of this lead nucleus? 82 1:19

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