Test Bank for Physics Principles with Applications ((3))

Physics: Principles with Applications, Sixth Edition



24) A pilot drops a bomb from a plane flying horizontally at a constant speed. Neglecting air
resistance, when the bomb hits the ground the horizontal location of the plane will
A) be behind the bomb.
B) be over the bomb.
C) be in front of the bomb.
D) depend on the speed of the plane when the bomb was released.
Answer: B
Diff: 2 Page Ref: Sec. 3.5-3.6


25) The acceleration of gravity on the Moon is only one-sixth of that on Earth. If you hit a baseball
on the Moon with the same effort (and at the speed and angle) that you would on Earth, the
ball would land
A) the same distance away.
B) one-sixth as far.
C) 6 times as far.
D) 36 times as far.
Answer: C
Diff: 2 Page Ref: Sec. 3.5-3.6


26) You are traveling at 55 mi/h in the +x axis relative to a straight, level road and pass a car
traveling at 45 mi/h. The relative velocity of your car to the other car is
A) -10 mi/h.
B) 10 mi/h.
C) 65 mi/h.
D) 35 mi/h.
Answer: B
Diff: 1 Page Ref: Sec. 3.8


27) You are trying to cross a river that flows due south with a strong current. You start out in your
motorboat on the east bank desiring to reach the west bank directly west from your starting
point. You should head your motorboat
A) due west.
B) due north.
C) in a southwesterly direction.
D) in a northwesterly direction.
Answer: D
Diff: 2 Page Ref: Sec. 3.8




47

,Chapter 3: Kinematics in Two Dimensions; Vectors



28) Your motorboat can move at 30 km/h in still water. How much time will it take you to move
12 km downstream, in a river flowing at 6.0 km/h?
A) 20 min
B) 22 min
C) 24 min
D) 30 min
Answer: A
Diff: 1 Page Ref: Sec. 3.8


Quantitative Problems

1) Vector A has magnitude 8.0 m at an angle of 30 degrees below the +x axis. The y component
of A is
A) 6.9 m.
B) -6.9 m.
C) 4.0 m.
D) -4.0 m.
Answer: D
Diff: 1 Page Ref: Sec. 3.2-3.4


2) If a ball is thrown with a velocity of 25 m/s at an angle of 37 e above the horizontal, what is the
vertical component of the velocity?
A) 12 m/s
B) 15 m/s
C) 19 m/s
D) 25 m/s
Answer: B
Diff: 1 Page Ref: Sec. 3.2-3.4


3) If you walk 6.0 km in a straight line in a direction north of east and you end up 2.0 km north
and several kilometers east. How many degrees north of east have you walked?
A) 19e
B) 45e
C) 60e
D) 71e
Answer: A
Diff: 2 Page Ref: Sec. 3.2-3.4




48

, Physics: Principles with Applications, Sixth Edition



4) A butterfly moves with a speed of 12.0 m/s. The x component of its velocity is 8.00 m/s. The
angle between the direction of its motion and the x axis must be
A) 30.0e .
B) 41.8e.
C) 48.2e .
D) 53.0e.
Answer: C
Diff: 2 Page Ref: Sec. 3.2-3.4


5) A 400-m tall tower casts a 600-m long shadow over a level ground. At what angle is the Sun
elevated above the horizon?
A) 34e
B) 42e
C) 48e
D) can't be found; not enough information
Answer: A
Diff: 2 Page Ref: Sec. 3.2-3.4


6) Two vectors A and B have components (0, 1) and (-1, 3), respectively. What are the
components of the sum of these two vectors?
A) (1, 4)
B) (-1, 4)
C) (1, 2)
D) (-1, 2)
Answer: B
Diff: 1 Page Ref: Sec. 3.2-3.4


7) Two vectors A and B have components (0, 1) and (-1, 3), respectively. What is magnitude of
the sum of these two vectors?
A) 2.8
B) 3.2
C) 3.9
D) 4.1
Answer: D
Diff: 1 Page Ref: Sec. 3.2-3.4




49