Question


The density of iron is 7.87 . What is the mass of a (variable l)* 4.00cm * 1.00 cm block of iron?
7.87 WHAT?
AND you can't have two unknowns. One is mass, the other is l. What is l?
However, you CAN solve for mass in terms of l.
7.87 g/ml
v = length*4*1 = 4*length

mass = volume x density
mass = 4*length*7.87 = 31.48*length

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