12. A cylindrical metal pipe has external diameter of 6 cm and internal diameter of 4 cm . Calculate the volume of metal in a pipe of length 1 m . If \( 1 \mathrm{~cm}^{3} \) of the metal has a mass of 8 g , find the mass of the pipe. 13. For two cylinders A and B , the ratio of lengths is \( 3: 1 \) and the ratio of diameters is \( 1: 2 \). Calculate the ratio of their volumes. 14. A machine makes boxes which are either perfect cylinders of diameter and length 4 cm , or perfect cubes of side 5 cm . Which boxes have the greater volume, and by how much? (Take \( \pi=3 \) ) 15. Natalia decided to build a garage and began by calculating the number of bricks required. The garage was to be 6 m by 4 m and 2.5 m in height. Each brick measures 22 cm by 10 cm by 7 cm . Natalia estimated that she would need about 40000 bricks. Is this a reasonable estimate?
UpStudy ThothAI Solution
Quick Answer
Step-by-step Solution
Enter your question here…