What do isotopes mean? Isotope, one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties. What are 3 examples of isotopes? The number of nucleons (both protons and neutrons) […]
How thick is a submarine pressure hull?
How thick is a submarine pressure hull? Making the hull. 4 Steel plates, approximately 2-3 in (5.1-7.6 cm) thick, are obtained from steel manufacturers. These plates are cut to the proper size with acetylene torches. 5 The cut steel plates are moved between large metal rollers under tons of pressure. Why do submarines not get […]
What is the correct order for doffing PPE?
What is the correct order for doffing PPE? Doffing PPE (Taking off) * If gloves are removed first, hands must only touch uncontaminated surfaces of the gown, typically behind the neck (ties) and at the back of the shoulders. The gown is then peeled down off the body and arms, balling or rolling in the […]
What are the disadvantages of tables?
What are the disadvantages of tables? Disadvantages of tables You can only squeeze in a small number of columns before the table width causes horizontal scrolling on smaller screens. Making columns narrow to prevent horizontal scrolling will decrease readability of text in cells, as a paragraph is stacked into one or two words per line. […]
What is a heat engine physics?
What is a heat engine physics? In thermodynamics and engineering, a heat engine is a system that converts heat or thermal energy to mechanical energy, which can then be used to do mechanical work. It does this by bringing a working substance from a higher state temperature to a lower state temperature. Why do you […]
Why is talking to strangers dangerous?
Why is talking to strangers dangerous? “Telling your child that strangers are dangerous can confuse her. Some kids with learning and thinking differences are prone to stress and anxiety. Talking about how to protect themselves from dangerous people might be scary. That anxiety might keep your child from hearing and remembering important messages. Why we […]
Did Galileo climb the tower of Pisa?
Did Galileo climb the tower of Pisa? In the popular story, to demonstrate objects of different mass fall at the same rate, Galileo dropped two spheres of different weights from the top of the Leaning Tower of Pisa. Both hit the ground at the same time. In one fell swoop, the brilliant scientist ended a […]
Is artificial selection harmful?
Is artificial selection harmful? Artificial selection in animals raised for consumption is unethical and harmful to both the animals being selected as well as the producers who raise them. An unfamiliar environment is needed to domesticate animals to suit human needs, causing both psychological and physical stress. How do farmers use selective breeding to increase […]
How do bats find their way?
How do bats find their way? As they fly they, make shouting sounds. The returning echoes give the bats information about anything that is ahead of them, including the size and shape of an insect and which way it is going. This system of finding prey is called echolocation – locating things by their echoes. […]
Does a heat pump increase electric bill?
Does a heat pump increase electric bill? Heat Pumps will raise your electricity bill – but lower your costs for other heating fuels. Each single unit (often referred to as a one-to-one) heat pump that is used daily will increase your electricity bill by $50 to $100 per month. Is a heat pump better than […]