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MCAT Physics Question — Lowest Density

  • by John
  • Jul 11, 2017
  • MCAT Question of the Day

Which of the materials in table 1 has the lowest density?

 

Material Volume (cm3) Mass (g)
ice 2 1.86
mercury 4 21.6
iron 6 47.4
methanol 10 7.9

 

A. ice

B. mercury

C. iron

D. methanol

Click for Explanation
Density is calculated as mass divided by volume. On inspection, ice and methanol have densities less than 1, and mercury and iron have densities greater than 1. On closer inspection, ice has density ρ=0.93 g/cm3 and methanol has density ρ=0.79 g/cm3.

 

Material Volume (cm3) Mass (g)
ice 2 1.86
mercury 4 21.6
iron 6 47.4
methanol 10 7.9

 

A. ice, incorrect, ρ=0.93 g/cm3.

B. mercury, incorrect, ρ=5.4 g/cm3.

C. iron, incorrect, ρ=7.9 g/cm3.

D. methanol, correct, ρ=0.79 g/cm3.

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