Question

The density of a solid is 4.2 ×10^3 kg m^−3 , the weight of that body whose volume is 2m^3 will be__________
(A) 8.4 kgwt (B) 8.4 ×10^4 kgwt (C) 8.4 ×10^5 kgwt (D) 8.4 ×10^7 kgwt

Answer 1

Mass = Volume × Density
= 2 m³ × 4.2 × 10³ kg/m³
= 8400 kg
Mass of object is 8400 kg

Weight of object = 8400 kgwt
= 8.4 × 10³ kgwt
[Here kgwt = 9.8 N ≈ 10 N]

No options given is correct. Correct answer MUST be 8.4 × 10³ kgwt