EM306_Quiz0 - units For example centi is 0.01 so a...

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EM306 Quiz #1 January 22, 2007 Name:________________________ Section:_______________ 1. What is a vector? 2. Let r be a vector quantity. If r = | r |, what does r represent? 3. If y = r r , what does y represent? 4. What is a scalar? Given two vectors a = i + 2 j + 3 k and b = 2 i + j + 2 k : 5. What is the sum of these two vectors? 6. What is the dot product of these two vectors? 7. What is the cross product a ! b of these two vectors?
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Units 8. What is the SI system of units? We know that a meter is a unit of length. More specifically, meter is the unit of measure and length is the physical quantity we are measuring. What is the physical quantity we are measuring for each of the following units? 9. grams - 10. pounds - 11. Newtons - 12. slugs - 13. ft-lbs - We know that prefixes are sometimes used to indicate smaller or larger quantities of
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Unformatted text preview: units. For example, centi is 0.01 so a centimeter is 1/100 of a meter. What are the numeric values for the following prefixes? 14. kilo - 15. milli - 16. mega - 17. giga - 18. micro – 19. The pressure exerted at a point on the hull of a deep submersible vehicle is 3 ! 10 6 Pa (pascals). Knowing that a pascal is 1 newton per square meter, 1 pound is 4.448 newtons and 1 foot = 0.3048 meters, determine the pressure in pounds per square foot. Physical concepts 20. What are newton's three laws of motion? • • • 21. What is inertia? 22. A force of 10 newtons is exerted on a mass of 10 grams. What is the resulting acceleration? 23. At sea level, a mass of 5 Kg rests on a wooden crate. What force does the earth’s gravity exert on the crate?...
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