Question: A rock is thrown straight up with an initial velocity of 24.5 m/s. What maximum height will the rock reach before starting to fall downward? Take acceleration due to gravity as 9.80 m/s².
Answer Options:
A) 25.0 m
B) 30.6 m
C) 35.0 m
D) 40.0 m
Answer: B) 30.6 m
Question: A rock is thrown straight up with an initial velocity of 19.6 m/s. What time interval elapses between the rock’s being thrown and its return to the original launch point?
Answer Options:
A) 3.50 s
B) 4.00 s
C) 4.50 s
D) 5.00 s
Answer: B) 4.00 s
Question: A baseball is released at rest from the top of the Washington Monument. It hits the ground after falling for 6.0 s. What was the height from which the ball was dropped? Ignore air resistance.
Answer Options:
A) 1.5 x 10² m
B) 1.6 x 10² m
C) 1.7 x 10² m
D) 1.8 x 10² m
Answer: D) 1.8 x 10² m
Question: A rock, released at rest from the top of a tower, hits the ground after 1.5 s. What is the speed of the rock as it hits the ground? Ignore air resistance.
Answer Options:
A) 10 m/s
B) 12 m/s
C) 15 m/s
D) 18 m/s
Answer: C) 15 m/s
Question: Human reaction time is usually about 0.20 s. If your lab partner holds a ruler between your finger and thumb and releases it without warning, how far can you expect the ruler to fall before you catch it?
Answer Options:
A) 10 cm
B) 15 cm
C) 20 cm
D) 25 cm
Answer: C) 20 cm
Question: A hiker walks 200 m west and then walks 100 m north. In what direction is her resulting displacement?
Answer Options:
A) 26.6° N of W
B) 45° N of W
C) 60° N of W
D) 30° N of W
Answer: A) 26.6° N of W
Question: A taxicab moves five blocks due north, five blocks due east, and another two blocks due north. Assume all blocks are of equal size. What is the magnitude of the taxi’s displacement, start to finish?
Answer Options:
A) 6.4 blocks
B) 7.5 blocks
C) 8.6 blocks
D) 10 blocks
Answer: C) 8.6 blocks
Question: The following force vectors act on an object: i) 50.0 newtons at 45.0° north of east and ii) 25.0 newtons at 30.0° south of east. What is the magnitude of the resultant force and its angle relative to the easterly direction?
Answer Options:
A) 40.0 newtons at 20.0°
B) 50.0 newtons at 25.0°
C) 60.4 newtons at 30.0°
D) 61.4 newtons at 21.8°
Answer: D) 61.4 newtons at 21.8°
Question: A string attached to an airborne kite is maintained at an angle of 40° with the horizontal. If a total of 120 m of string is reeled in while bringing the kite back to the ground, what is the horizontal displacement of the kite in the process? Assume the kite string doesn’t sag.
Answer Options:
A) 75 m
B) 82 m
C) 92 m
D) 100 m
Answer: C) 92 m
Question: Jack pulls a sled across a level field by exerting a force of 110 N at an angle of 30° with the ground. What are the parallel and perpendicular components, respectively, of this force with respect to the ground?
Answer Options:
A) 55 N, 95 N
B) 95 N, 55 N
C) 100 N, 60 N
D) 110 N, 30 N
Answer: B) 95 N, 55 N
Question: A jogger runs halfway around a circular path with a radius of 60 m. What, respectively, are the magnitude of the displacement and the distance jogged?
Answer Options:
A) 188 m, 120 m
B) 120 m, 188 m
C) 150 m, 200 m
D) 200 m, 150 m
Answer: B) 120 m, 188 m
Question: John throws a baseball from the outfield from shoulder height, at an initial velocity of 29.4 m/s at an initial angle of 30.0° with respect to the horizontal. The ball is in its trajectory for a total interval of 3.00 s before the third baseman catches it. Ignore the air resistance. What is the ball’s horizontal displacement?
Answer Options:
A) 65.3 m
B) 70.2 m
C) 76.4 m
D) 80.0 m
Answer: C) 76.4 m
Question: A baseball thrown from the outfield is released from shoulder height at an initial velocity of 29.4 m/s at an initial angle of 30.0° with respect to the horizontal. If it is in its trajectory for a total of 3.00 s before being caught by the third baseman, what is the ball’s net vertical displacement during its 3-s trajectory?
Answer Options:
A) zero
B) 5 m
C) 10 m
D) 15 m
Answer: A) zero