# Scales (check work)

1. Feb 5, 2004

### tandoorichicken

A block of iron is suspended from one end of an equal-arm balance by a thin wire. To balance the scales, 2.35 kg are needed on the scale pan at the other end.
(a) What is the vloume of the block?
(b) Next a beaker of water is placed so that the iron block is submerged in the beaker but not touching the bottom. What mass is now necessary to balance the scales?

What I did:
density of iron = 7.87 * 10^3 kg/m^3
a) 2.35/$\rho_{\text{iron}}$ = V = 299 cm^3
b) V = V of displaced water = m of water in grams
2.35 kg - 299 g = 2.05 kg

2. Feb 6, 2004

### HallsofIvy

Staff Emeritus
Looks good to me.