Engineers are looking for a new material to build an oil tanker. The material must be lightweight, strong, and durable. Several engineers have developed some initial plans. The engineers are in which stage of technological design? A) identifying a problem or need B) designing a solution C) implementing a solution D) evaluating a solution

Fossil fuels are organic compounds that are made from

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 300j of energy to the room?unit:

How can a scientist assess whether a pure niobium (nb) sample is responsible for contaminating the lab with radioactivity? test the niobium sample to see whether it now contains other elements.test the niobium sample for the presence of niobium oxide compounds.heat the niobium, and see if the level of radioactivity in the lab increases.place the niobium under pressure, and see if the level of radioactivity in the lab increases.