What is the density of a 12.475g piece of metal that causes the level of water in a graduated cylinder to rise from 5.0 to 6.1 ml when the metal is submerged in the water?
consider significant figures when doing the calculation.

11.3 g/mL.

Explanation:

d = m/V,

where, d is the density of the metal,

m is the mass of the metal (m = 12.475 g),

V is the volume that the metal takes up (V = 6.1 mL - 5.0 mL = 1.1 mL).

∴ d = m/V = (12.475 g)/(1.1 mL) = 11.34 g/mL ≅ 11.3 g/mL.

The significant figures has its rules in the calculations; the result has a significant figures to the lowest no. of significant figures (1.1 has two significant figures, while 12.475 has 5 significant figures), so the result should have only 2 significant figures.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current