The density of iron is 7.87 . What is the mass of a (variable l)* 4.00cm * 1.00 cm block of iron?

Answer 1

7.87 WHAT?
AND you can't have two unknowns. One is mass, the other is l. What is l?

Answer 2

However, you CAN solve for mass in terms of l.

Answer 3

7.87 g/ml

Answer 4

v = length*4*1 = 4*length

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