PHYSICS 205 Unit Test 1 PART ONE: COMPLETE OR SELECT THE BEST ANSWER 1. The jerk
ID: 1874515 • Letter: P
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PHYSICS 205 Unit Test 1 PART ONE: COMPLETE OR SELECT THE BEST ANSWER 1. The jerk is a quantity that measures the The English-system unit of length corresponding to the meter in the St is the The metric system of units was first introduced in what country? of acceleration 2. 3. 4. The international standard of is a cylinder of a platinum-iridium alloy 5. Physical quantities fall into one of two categories: scalars and 6. If the component of vector A in the direction of vector B is zero, what can you conclude about the two vectors? 7. The velocity of an object at an instant of time can be greater in magnitude than the average velocity over a time interval containing the instant. (T) (F) 8. The average speed of a trip equals total distance divided by a very short time interval. (T) (F) 9. In free fall, the distance traveled by a dropped object is proportional to time squared. (T) (F) 10. The symbol represents the rate of change of one quantity with respect to another. (T) (F) 11. v(a)"-an/2 (T) (F) 12. A rock dropped from the top of a tall building travels the same distance during each 1- second interval that it falls. (T) (F) 13. A calculator displays a result as 1.3628080 x107 kg. The estimated uncertainty in the result is ±2%. How many digits should be included as significant when the result is written down? (a) one; (b) two; (c) three; (d) four; (e) five 14. The order of magnitude of the number of table-tennis balls that would fit into a typical-size room (5 m by 4 m by 3 m) is (a) 106 (b) 10 ; (c) 10 8; (d) 10 9 15. What is the magnitude of the vector (10i - 10k) m/s? (a) 0; (b) 10; (c) -10; (d) 14.1 16. On another planet, a marble is released from rest at the top of a high cliff. It falls 4.00 m in the first 1 second of its motion. Through what additional distance does it fall in the next 1 s? (a) 4.00 m; (b) 8.00 m; (c) 12.0 m; (d) 16.0 mExplanation / Answer
1. jerk is a quantity that measures rate of change of acceleration with respect to time
2. in english system, the unit of length corresponding to meter is foot
3. the metric system was first introduced in france
4. the international standard of 1 kg weight is a cylinder of platinum iridium alloy
5. Physical quantities can be scalars or vectors
6. if component of vector A in direction of B is 0, we can conclude that the two vectors are perpendicular
7. the velocity of an object can be greater than average velocity over a time interval , hence true
8. average speed = total distacne.total time, hence false
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