surf board? A) 233.48J B) 23.80J C) 16.68J D) 137.34J E) 0.00J 8. [2pt] A child
ID: 1286637 • Letter: S
Question
surf board? A) 233.48J B) 23.80J C) 16.68J D) 137.34J E) 0.00J 8. [2pt] A child weighs 275 N. What is the child?s mass? A) 61.8kg B) 275.0kg C) 2697.8kg D) 28.0kg E) 1222.2kg 9. [2pt] A weight lifter raises a 99-kg barbell to a height of 1.9 m. What is the barbell?s change in potential energy? A) 971J B) 18.6J C) 188J D) 1845J E) 357J lo. [2pt] A net force of 31 N accelerates a 4.2-kg mass over a distance of 18 m. What is the total work done by this net force? A) 0J B) 7.4J C) 76J D) 558J E) 130J 11. [2pt] For the mass from the preceding problem, what is the increase of the kinetic energy of the mass? A) Half the total work done on the mass. B) There is no change in kinetic energy. C) The same as the total work done on the mass.Explanation / Answer
8) The child's mass = Weight / acceleration due to gravity
= 275/9.8 = 28kg. So Option D
9) Change in Potential Energy = mgh = 99 * 1.9 * 9.8 = 1843.38J. So option D
10) Work done = Force * Distance moved = 31 * 18 = 558J. Option D
11)Option C) the same as total work done on the mass
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.