i came to america before one year ago and i really need help in math...please help me??????
according to the U.S. mint ,pennies are made of 97.5 .percent zink and 2.5 percent copper by mass .copper has a denisty of 8.96 grams of mass per cubic centimeter of volume.zink has adenisty of 7.13 grams of mass per cubic centimeter of volume.
what is the ratio of the mass of zink to the mass of coppe in a penny?
what is the ratio of the volume of zink to the volume of copper in a penny????
2006-09-16 06:55:55 · 5 answers · asked by beauty mirna 3 in Education & Reference ➔ Homework Help
is there any more information?
you need to know the mass of a penny to solve this
2006-09-16 07:10:55 · answer #1 · answered by afireinsideme [DF] 6 · 0⤊ 0⤋
Assume 100 gram sample
97.5 grams zinc and 2.5 grams copper
Devide by the density to get the volume
97.5g/7.13g/cc = 13.7 cubic centimeters
2.5g/8.96g/cc = 0.279 cubic centimeters
So in a 100g sample the ratio of zinc to copper is 13.7/.279
Therefor there is 49.1 cubic centimeters of zinc
per cubic centimeter of copper.
2006-09-16 13:57:49 · answer #2 · answered by Steve-Ohhhh 2 · 0⤊ 0⤋
2.8 megabits toa ounce comes out at.3 to 6 but only if the coin is fresh at 9.9
2006-09-16 13:57:55 · answer #3 · answered by pirateron 5 · 0⤊ 0⤋
A ratio is simply a question of division -- one number as it relates to another.
volume of zinc / volume of copper
you do the rest...
2006-09-16 13:57:39 · answer #4 · answered by Anonymous · 0⤊ 1⤋
here is a hint, divide
2006-09-16 14:03:25 · answer #5 · answered by flinch387 2 · 0⤊ 0⤋