Question

A solid rectangular piece of metal measures 3 m long, 1.5 m wide, and 3 cm thick. Find the weigh
this piece if a cubic centimetre of the metal weighs 7 g.​

Answer 1

Answer:

945 kg

Explanation:

1m=100cm

∴3m=300cm and 1.5m=150cm

volume= length ×width ×height

V= 300cm× 150cm× 3cm

cubic centimetre ($1 cm^{3}$)of the metal weighs 7 g= density of the metal(D)

$D=\frac{M}{V}$

M= D V

M=  (300× 150× 3)$cm^{3}$ × 7 $g cm^{-3}$

Weight = 945,000g

1000g=1kg

∴weight= 945 kg