What are the noise control methods? Extraction, ventilation, cooling, openings in walls and enclosures. Instead of fitting silencers, it is often possible to achieve a 10 – 20 dB reduction in airborne noise from a duct or opening by lining the last bend in the ductwork with acoustic absorbent (foam or rockwool / fibreglass). Which […]
What did Penzias and Wilson discovery prove?
What did Penzias and Wilson discovery prove? Penzias and Wilson had spotted the CMB, the predicted thermal echo of the universe’s explosive birth. The landmark find put the Big Bang theory on solid ground, suggesting that the cosmos did indeed grow from a tiny seed — a single point — about 13.8 billion years ago. […]
What is the best sampling method?
What is the best sampling method? Random sampling What are the 4 types of sampling? There are four main types of probability sample. Simple random sampling. In a simple random sample, every member of the population has an equal chance of being selected. Systematic sampling. Stratified sampling. Cluster sampling. What are the sampling methods? Methods […]
Which best describes the future of employment in the energy career cluster?
Which best describes the future of employment in the energy career cluster? Which best describes the future of employment in the Energy career cluster? Oil and gas extraction and developing plant-based fuels are on the rise while coal mining, metal ore mining, and pipeline transportation are on the decline. Alton works in Energy Transmission. What […]
Which circuit is better series or parallel?
Which circuit is better series or parallel? Two bulbs in a simple parallel circuit each enjoy the full voltage of the battery. This is why the bulbs in the parallel circuit will be brighter than those in the series circuit. Another advantage to the parallel circuit is that if one loop is disconnected, then the […]
What are the top 5 exercises?
What are the top 5 exercises? 7 Most Effective Exercises Walking. Any exercise program should include cardiovascular exercise, which strengthens the heart and burns calories. Interval training. Squats. Lunges. Push-ups. Abdominal Crunches. Bent-over Row. How can I get my flexibility back? Bend your knees and keep a straight back when picking up your weight. Place […]
What is the most important compound?
What is the most important compound? water What are the 10 most common compounds? Glossary Compound Formula Abundance parts per million by weight Silicon dioxide SiO2 428,600 Magnesium oxide MgO 350,700 Ferrous oxide FeO 89,700 Aluminum oxide Al2O3 69,900 What are examples of common compounds? Examples of Compounds – Common Compounds C2H6O: Alcohol. NaCl: Salt. […]
Why would air pressure be greater at sea level than it would be on the top of a mountain?
How do liquids compare to density?
What is the difference between salt and sugar dissolving in water?
What is the difference between salt and sugar dissolving in water? The oppositely charged ends of polar water molecules attract the ions and pull them away, resulting in dissolving. Sugar is made from sucrose molecules which are larger and more complex than the ions in salt (See Teacher Background Lesson 1.2). When sugar dissolved in […]