You have a 30-gram sample of Radium 226. It has a half-life of 1620 years. How many years will it take to only have 7.5 grams of Radium 226

Based on the law of conservation of energy, which statement is false? answer- energy is lost when machines dont work right

Esign techniques and materials that reduce the negative environmental impact of a structure are referred to as

Which of the following is not a good technique for managing used oil? a) have specific, labeled catch pans available for technicians who are collecting oil b) spills in your shop and any releases on pavement or outside should be poured down a drain c) do not use oil containers for antifreeze or other non-similar fluids d) be prepared for oil spills with the proper absorbents