Question

d. (9 points) Short answer Disclaimer: My daughter Erin thought up this morbid question! The gangster Jimmy Hoffa disappeared back in 1975. People joke that he is wearing "cement overshoes”, meaning someone has drowned him with concrete shoes on so hopefully he will not surface. (This is not to be taken literally, but just for fun...) Assume that Jimmy has a density of 985 kg/ m3, and has a volume of 62,000 cubic centimeters, and the density of sea water is 1020 kg/m3. a. Will Jimmy float? b. Now add the cement "shoes” – the density of concrete is 2400 kg/m3, and assume each shoe has a volume of 0.00314 m3 each. If Jimmy is wearing these shoes, now does he float? Show your work! I need to see numbers!

Answer 1

62000 CC = Density of Jimmy is = 985 kg/m3 Volume of Jimmy is = 0.062 m3 Density of Sea Water is = 1020 kg/m3 a) ng on him If Jimmy is completely submerged then the buoyancy force acti will be U? (1020x0-062x9.81) N 620.38 44N weight of Jim mmy is, w= 60-062 x 985 x 9.81) N = 599.0967 N

as, u>w therefore Jimmy will float. b) Density of Concrete is = 2400 kg/m3 Volume of each shoe is = 0.00314 m3 Net volume of concrete present in Jimmy's shoe (2X0.00 314) = 0.00628 m3 is force Now after adding shoes made of concrete buyoncy acting on on Jimmy will be {(0.0627 000628) x 1020x 9.81}n 683 · 223336 N U -

now with Weight of Jimmy concrete shoes is W= {(985X0.062X9-81) + (2400 X0-00628x9.817} w - 746.95302 N :. wou Jimmy will not float. o