A roll of aluminum foil from the grocery store is 25 centimeters wide by 25 meters long (if you unroll it). If the roll of foil has a mass of 2.8kg and the density of aluminum is $2700 { \mathrm { kg } } / \mathrm { m } ^ { 3 }$ ,
What is the thickness of the aluminum foil?
A) 0.0003 cm
B) 0.0004 cm
C) 0.00017 cm
D) 0.0023 cm

Question

A roll of aluminum foil from the grocery store is 25 centimeters wide by 25 meters long (if you unroll it). If the roll of foil has a mass of 2.8kg and the density of aluminum is $2700  { \mathrm { kg } } / \mathrm { m } ^ { 3 }$ ,
What is the thickness of the aluminum foil?
A) 0.0003 cm
B) 0.0004 cm
C) 0.00017 cm
D) 0.0023 cm

Quizplus · Accepted Answer

To find the thickness, use the formula: Volume = Mass / Density. The volume of the foil is also equal to its area times its thickness. The area is 25 cm x 2500 cm (converted from 25 meters). Solving for thickness gives approximately 0.00017 cm.

A Roll of Aluminum Foil from the Grocery Store Is 2700kg/m32700 { \mathrm { kg } } / \mathrm { m } ^ { 3 }2700kg/m3

A Roll of Aluminum Foil from the Grocery Store Is $2700 { \mathrm { kg } } / \mathrm { m } ^ { 3 }$