Answer:
The answer to your question is 46 N (The weight is not measured in volume units, its units are of force).
Step-by-step explanation:
Data
density = 19.4 g/cm³
dimensions = 3 in x 5 in x 2.5 cm
1 in = 2.54 cm
Process
1.- Convert the dimensions to cm
1 in ------------- 2.54 cm
3 in -------------- x
x = (3 x 2.54) / 1
x = 7.62 cm
1 in -------------- 2.54 cm
5 in -------------- x
x = (5 x 2.54) / 1
x = 12.7 cm
2.- Calculate the volume of the bar
Volume = 12.7 x 7.62 x 2.5
= 241.84 cm³
3.- Calculate the mass
density = mass / volume
mass = density x volume
mass = 19.4 x 241.84
= 4693.54 g
4.- Calculate the weight
weight = mass x gravity
= 4.7 x 9.81
= 46 N
