This is one of my Doctoral assignment from Current Science and Technology in Japan Course which has never been published anywhere and I, as the author and copyright holder, license this assignment customized CC-BY-SA where anyone can share, copy, republish, and sell on condition to state my name as the author and notify that the original and open version available here.
1. Why do we need high strength metals for making a new car?
2. You are going to pick up “Treasure box(500kg)” at bottom of deep hole (5000m in depth). You have a long steel wire with 30kg/mm2 of strength, 5mm of diameter and 10000m of length. Can you pick up the box, or not? (If you couldn’t pick up by using the steel wire, what type of wire to get to pick up the box?)
This work is licensed under a Creative Commons Attribution-CustomizedShareAlike 4.0 International License. I Fajar Purnama as the creator customized the ShareAlike (sa) license here where you are also allowed to sell my contents but with a condition that you must mention that the free and open version is available here. In summary, the mention must contain the keyword "free" and "open" and the location such as the link to this content.