Unit 1: Science and Engineers Quiz 1.3: Question 1: Which statement is criterion for this project?
B: The train must be able to maintain a speed of 250km/h
Question 2: Which statement about criteria and constraints is true?
B: They are more useful if they include numerical values
Question 3: Which event is an example of engineering helping science?
B: Satellite imaging is used to map the extent of fires in the rain forest
Question 4: Which statement describes a way in which society affects the development of technology?
C: The need for artificial limbs lead to the development of robotic arms and legs
Question 5: Which statement is the best example of how society affects the use of technology

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

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