A runner runs 10 m from the origin toward the WEST to point A. He then runs from point A 20 m more toward the EAST to point B. He then runs from point B 30 m more toward the WEST to point C. The runner's total displacement from the origin to point C is
A. 60 m toward the WEST.
B. 50 m toward the WEST.
C. 20 m toward the WEST.
D. 10 m toward the WEST.
E. 0 m.
C. 20 m toward the WEST.
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What determines the time of flight (the time it takes to reach the ground) of a ball rolling off a table?
A. The initial horizontal velocity of the ball. B. The height of the table. C. The ball will always reach the ground in the same amount of time, regardless of height or velocity.
The column of Trajan, erected in Rome in 106-113 A.D., is 125 feet tall. What is its height in centimeters?
A) 1,510 cm B) 591 cm C) 2,520 cm D) 3,810 cm E) 38,100 cm
Mort weighs 700 newtons on Earth. He takes a low-orbit voyage in an Earth satellite. While in orbit his apparent weight [his feeling of weight] is
A) zero. B) a little less than 700 newtons. C) a little more than 700 newtons. D) just a few newtons. E) 700 newtons.
A concave spherical mirror has a focal length of magnitude 20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is the image located?
A) 20 cm behind the mirror B) 20 cm in front of the mirror C) 6.7 cm behind the mirror D) 6.7 cm in front of the mirror