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a) It is wintertime and you have to cross a lake. Unfortunately, the only option is to use one of the pieces of ice floating on the water with an area of about 4.0 m2 (the ice pieces have roughly circular and disc-like shapes). Assume your mass is 70 kg - what minimum thickness must an ice piece have so that you can stand on it just without getting your shoes wet? Use density of water of 1.0 10' kg/m and ice of 0.92 · 10' kg/m Hint: Figure out what are the upward and downward forces in that problem.

a) It is wintertime and you have to cross a lake. Unfortunately, the only option is to use one of the pieces of ice floating on the water with an area of about 4.0 m2 (the ice pieces have roughly circular and disc-like shapes). Assume your mass is 70 kg - what minimum thickness must an ice piece have so that you can stand on it just without getting your shoes wet? Use density of water of 1.0 10' kg/m and ice of 0.92 · 10' kg/m Hint: Figure out what are the upward and downward forces in that problem.

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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a) It is wintertime and you have to cross a lake. Unfortunately, the only option is to use one of the pieces of ice floating on the water with an area of about 4.0 m? (the ice pieces have roughly circular and disc-like shapes). Assume your mass is 70 kg - what minimum thickness must an ice piece have so that you can stand on it just without getting your shoes wet? Use density of water of 1.0 10° kg/m and ice of 0.92 · 10 kg/m? Hint: Figure out what are the upward and downward forces in that problem. b) On a field trip, you have to characterize an ore sample. The sample weights 18.30 N in air. When you suspend it by a light string and totally immerse it in water, the tension in the cord is 11.50 N. What is the total volume and the density of your sample? Use density of water of 1.000 · 10° kg/m?
Transcribed Image Text:a) It is wintertime and you have to cross a lake. Unfortunately, the only option is to use one of the pieces of ice floating on the water with an area of about 4.0 m? (the ice pieces have roughly circular and disc-like shapes). Assume your mass is 70 kg - what minimum thickness must an ice piece have so that you can stand on it just without getting your shoes wet? Use density of water of 1.0 10° kg/m and ice of 0.92 · 10 kg/m? Hint: Figure out what are the upward and downward forces in that problem. b) On a field trip, you have to characterize an ore sample. The sample weights 18.30 N in air. When you suspend it by a light string and totally immerse it in water, the tension in the cord is 11.50 N. What is the total volume and the density of your sample? Use density of water of 1.000 · 10° kg/m?
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70/4(1-0.92)1000 does not equal 17.5, and I would like an explanation on why from mg suddenly g got canceled 

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