Math problem: How many kilograms does an iron bar with a diameter of 100 mm and a length of 1 m weigh? Urgent! I don't want the formula. I just want to know the answer, how many kilograms.
Density of iron: 7.8g/cm^3.
100 mm = 10 cm
1 m = 100 cm
Volume: 3.14× (10/2) 2×100 = 7850 cubic centimeters.
Weight: 7850 * 7.8 = 61230g = 61.23kg.