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
To find the mass of a block of iron, we can use the formula:
Mass = Density x Volume
In this case, the density of iron is given as 7.87 g/cm³. The volume of the block is calculated by multiplying its length (l), width (4.00cm), and height (1.00cm).
So, the formula becomes:
Mass = 7.87 g/cm³ x l cm x 4.00cm x 1.00cm
Now, we can multiply the density and the dimensions of the block to find the mass. The value of (l) is not specified in the question, so the mass will depend on the value of l chosen. If you want the mass for a specific value of l, substitute that value in place of (l) in the formula.