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Unformatted text preview: Physics 53 Quiz #la Fall 2007 Name Recit. Section Circle the correct answer: 1. [2 points] Two identical objects are thrown off the same bridge and
fall to the ground at the same level and the same horizontal distance
from the bridge. Object A is thrown straight into the horizontal
direction; object B is thrown upwards at an angle of 30° with respect
to vertical. Which object reaches the ground first? 2.? Object A.
b) Object B.
0) Both objects reach the ground at the same time. 2. [2 points] Which of the following objects defines an inertial reference
frame?
(a A train going around a left bending curve at constant speed.
“:7 A train uniformly slowing down along a straight track.
0) A train traveling along a straight track at constant speed. 3. [3 points] A traveler walks on a moving walkway in an airport at a
speed of 2.00 m/s in the direction of the motion of the belt. The
walkway belt is moving at 2.50 m/s with respect to the terminal
building. Her boyfriend, to impress her, runs on the walkway that’s
moving in the opposite direction with the same speed. How fast does
he need to run in order to keep up with her? 4.50 m/s 9.00 m/s 4. [3 points] A rocket lifts off with constant acceleration a = 30 m/s2 at a
60° angle with respect to the vertical. How high is the rocket above
grond when it reaches a speed of 6 km/s? ——7 300 km b) 600 km
0) 1200 km Physics 53 Quiz #lb Fall 2007 Name Recit. Section Circle the correct answer: 1. [2 points] Two identical objects are thrown off the same bridge and
fall to the ground at the same level and the same horizontal distance
from the bridge. Object A is thrown upwards at an angle of 30°; object
B is thrown downwards at an angle of 30°, both angles measured with
respect to the vertical. Which object reaches the ground ﬁrst? Object A.
b) Object B.
0 Both objects reach the ground at the same time. 2. [2 points] Which of the following objects defines an inertial reference frame?
a An airplane going around a curve at constant speed. An airplane descending at a constant velocity. 0 An airplane taking off at constant acceleration. 3. [3 points] A traveler walks on a moving walkway in an airport at a
speed of 1.50 m/s in the direction of the motion of the belt. The
walkway belt is moving at 2.00 m/s with respect to the terminal
building. Her boyfriend, to impress her, runs on the walkway that’s
moving in the opposite direction with the same speed. How fast does
he need to run in order to keep up with her? a) 3.50 m/s 5.00 m/s
' 5.50 m/s 4. [3 points] A rocket lifts off with constant acceleration a = 20 m/s2 at a
30° angle with respect to the horizontal. How high is the rocket above grnd when it reaches a speed of 8 km/s? 800 km bi 1600 km 6) 3200 km ...
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This note was uploaded on 05/13/2010 for the course PHYSICS 53L taught by Professor Mueller during the Fall '07 term at Duke.
 Fall '07
 Mueller
 Physics

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