1AbQuiz2

1AbQuiz2 - Physics 1A (b) Fall 2006: Quiz 2 Version D 1...

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Physics 1A (b) Fall 2006: Quiz 2 Version D 1 09.29.06 Closed book. No work needs to be shown for multiple-choice questions. 1 . Which of the following is an example of a vector quantity? a. volume b. temperature c. mass d. velocity 2 . Vector A r is 3.0 units in length and points along the positive x-axis ; vector B r is 4.0 units in length and points along a direction 150 ° from the positive x-axis . What is the magnitude of the resultant when vectors A r and B r are added? a. 7.0 b. 2.1 c. 4.7 d. 6.7 3 . If we know that a nonzero net force is acting on an object, which of the following must we assume regarding the object’s condition? The object is: a. at rest. b. moving with a constant velocity. c. losing mass. d. being accelerated. 4 . A ball is rolled horizontally off a table with an initial speed of 0.24 m/s. A stopwatch measures the ball’s trajectory time from table to the floor to be 0.30 s. What is the height of the table? (air resistance is negligible)
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1AbQuiz2 - Physics 1A (b) Fall 2006: Quiz 2 Version D 1...

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