Question

What is the weight of a rectangular block of a cost iron of 250cm X 20cm X 8cm (density of cast iron is 7.8 gm/cm³)?

Answer 1

Answer:

3120 kg ( mass = 312 kg)

Step-by-step explanation:

Since, volume = 40000 cm cube

and density = 7.8 gm/cm^3

therefore, mass = volume x density = 312000gm

now, in kg

mass = 312000/ 1000 = 312 kg

for the weight ,

multiply mass with gravity due to acceleration of earth ( since question has not asked weight in which planet, we will take earth as the planet)

then

weight = mg

= 312 kg x 10m / s^2= 3120 N or Kg