A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weighs 8 g/cm³, what is the weight of the pipe?
Q1. A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weighs 8 g/cm³, what is the weight of the pipe?
Answer: 3.696 kg
Explanation: The correct value is 3.696 kg. Apply the formula or arithmetic step shown in the question and