Broward College - Central Campus
PHY2053
Review Chapter 6
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) A point on a wheel of radius 40 cm that is rotating at a constant 5.0 revolutions per
second is located 0.20 m from the axis of rotation. What is the acceleration of that point
due to the spin of the wheel?
A) 48 m/s2
B) 0.050 m/s2
C) 1.4 m/s2
D) 0.00 m/s2
E) 200 m/s2 1) 2) You are driving at 30.0 m/s on a freeway curve of radius 25.0 m. What is the magnitude
of your acceleration?
A) 36.0 m/s2
B) 0.833 m/s2
C) 20.8 m/s2
D) 1.20 m/s2 2) 3) A jet plane flying 600 m/s experiences an acceleration of 4.0 g when pulling out of the
circular section of a dive. What is the radius of curvature of this section of the dive?
A) 0.64 km
B) 1.2 km
C) 9.2 km
D) 5.8 km
E) 7.0 km 3) 4) A 1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter
is 0.20 km. What is the magnitude of the friction force required to keep the car from
sliding?
A) 3000 N
B) 900 N
C) 9800 N
D) 9000 N
E) 300 N 4) 5) A 250-kg motorcycle goes around an unbanked turn of radius 13.7 m at a steady 96.5
km/h. What is the magnitude of the net force on the motorcycle?
A) 1.31 × 104 N
B) 719 N
C) 4.31 × 104 N
D) 2.95 × 103 N 5) 6) A car moving at a steady 10 m/s on a level highway encounters a depression that has a
circular cross-section with a radius of 30 m. The car maintains its speed as it drives
through the depression. What is the normal force exerted by the seat of the car on a
60.0-kg passenger when the car is at the bottom of the depression?
A) 590 N
B) 490 N
C) 790 N
D) 200 N
E) 390 N 6) 7) A car moving at a steady 10 m/s on a level highway encounters a bump that has a
circular cross-section with a radius of 30 m. The car maintains its speed over the bump.
What is the normal force exerted by the seat of the car on a 60.0-kg passenger when the
car is at the top of the bump?
A) 200 N
B) 490 N
C) 790 N
D) 590 N
E) 390 N 7) 1 8) A 40-kg box is being pushed along a horizontal smooth surface. The pushing force is 15
N directed at an angle of 15° below the horizontal. What is the magnitude of the
acceleration of the crate?
A) 0.16 m/s2
B) 0.39 m/s2
C) 0.36 m/s2
D) 0.68 m/s2
E) 0.47 m/s2 8) 9) A 50.0-kg crate is being pulled along a horizontal smooth surface. The pulling force is
10.0 N and is directed 20.0° above the horizontal. What is the magnitude of the
acceleration of the crate?
A) 0.0684 m/s2
B) 0.0728 m/s2
C) 0.188 m/s2
D) 0.200 m/s2
E) 0.376 m/s2 9) 10) Two 10) 11) An 11) forces act on a 55-kg object. One force has magnitude 65 N directed 59° clockwise
from the positive x-axis, and the other has a magnitude 35 N at 32° clockwise from the
positive y-axis. What is the magnitude of this object's acceleration?
A) 1.3 m/s2
B) 1.7 m/s2
C) 1.1 m/s2
D) 1.5 m/s2
object is being acted upon by three forces and as a result moves with a constant
velocity. One force is 60.0 N along the +x-axis, and the second is 75.0 N along the
+y-axis. What is the magnitude of the third force?
A) 135 N
B) 96.0 N
C) 48.0 N
D) 67.5 N
E) 15.0 N 2 12) A 6.00-kg ornament is held at rest by two light wires that form 30° angles with the
vertical, as shown in the figure. An external force of magnitude F acts vertically
downward on the ornament. The tension exerted by each of the two wires is denoted by
T. A free-body diagram, showing the four forces that act on the box, is shown in the
figure. If the magnitude of force F is 410 N, what is the magnitude of the tension T? A) 376 N B) 271 N C) 235 N D) 470 N E) 188 N 13) The figure shows a block of mass M hanging at rest. The light wire fastened to the wall
is horizontal and has a tension of 38 N. The wire fastened to the ceiling is also very light,
has a tension of 59 N, and makes an angle θ with the ceiling. Find the angle θ. A) 50° B) 45° C) 33° D) 65° E) 10.0-kg picture is held in place by two wires, the first one hanging at 50.0° to the left
of the vertical and the second one at 45.0° to the right of the vertical. What is the tension
in the first wire?
A) 98.1 N
B) 23.8 N
C) 50.8 N
D) 69.4 N
E) 69.6 N
10-kg sign is held by two ropes as shown in the figure. What is the tension on rope A? A) 88 N B) 98 N C) 44 N
3 D) 72 N E) 13) 40° 14) A 15) A 12) 69 N 14) 15) 16) A 16) 17) A 17) 18) Three boxes 18) 19) As 19) 3.0-kg and a 5.0-kg box rest side-by-side on a perfectly smooth, level floor. A
horizontal force of 32 N is applied to the 3.0-kg box pushing it against the 5.0-kg box,
and, as a result, both boxes slide along the floor. How hard do the two boxes push
against each other?
A) 20 N
B) 24 N
C) 32 N
D) 0 N
E) 12 N
3.0-kg and a 5.0-kg box rest side-by-side on a smooth, level floor. A horizontal force
of 32 N is applied to the 5.0-kg box pushing it against the 3.0-kg box, and, as a result,
both boxes slide along the floor. How hard do the two boxes push against each other?
A) 20 N
B) 32 N
C) 12 N
D) 0 N
E) 24 N
rest side-by-side on a smooth, horizontal floor. Their masses are 5.0 kg, 3.0
kg, and 2.0 kg, with the 3.0-kg mass in the center. A force of 50 N pushes on the 5.0-kg
box, which pushes against the other two boxes. What magnitude force does the 5.0-kg
box exert on the 3.0-kg box?
A) 10 N
B) 50 N
C) 25 N
D) 0 N
E) 40 N
shown in the figure, a 10-kg block on a perfectly smooth horizontal table is connected
by a horizontal string to a 63-kg block that is hanging over the edge of the table. What is
the magnitude of the acceleration of the 10-kg block when the other block is gently
released? A) 8.5 m/s2 B) 9.0 m/s2 C) 8.1 m/s2 D) 7.5 m/s2 20) A 20) 21) A 21) 50-kg box is being pushed along a horizontal surface. The coefficient of static friction
between the box and the ground is 0.65, and the coefficient of kinetic friction is 0.35.
What horizontal force must be exerted on the box for it to accelerate at 1.2 m/s 2?
A) 60 N
B) 170 N
C) 120 N
D) 490 N
E) 230 N
50-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of
30.0° below the horizontal is applied to the box. The coefficient of static friction
between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.30.
What is the force of friction on the box?
A) 250 N
B) 200 N
C) 620 N
D) 220 N
E) 32 N 4 22) A 22) 23) A 23) 24) A 24) 55-kg box rests on a horizontal surface. The coefficient of static friction between the
box and the surface is 0.30. A horizontal 140-N force is applied to the box. What is the
friction force on the box?
A) 160 N
B) 16.5 N
C) 140 N
D) 0.00 N
E) 42 N
horizontal 52-N force is needed to slide a 50-kg box across a flat surface at a constant
velocity of 3.5 m/s. What is the coefficient of kinetic friction between the box and the
floor?
A) 0.10
B) 0.13
C) 0.11
D) 0.09
15-kg block is on a frictionless ramp that is inclined at 20° above the horizontal. It is
connected by a very light string over an ideal pulley at the top edge of the ramp to a
hanging 19-kg block, as shown in the figure. The string pulls on the 15-kg block parallel
to the surface of the ramp. Find the magnitude of the acceleration of the 19-kg block after
the system is gently released? A) 4.5 m/s2 B) 4.0 m/s2 C) 3.8 m/s2 D) 4.2 m/s2 25) The figure shows a block of mass m resting on a 20° slope. The block has coefficients of
friction μs = 0.64 and μk = 0.54 with the surface of the slope. It is connected using a very
light string over an ideal pulley to a hanging block of mass 2.0 kg. The string above the
slope pulls parallel to the surface. What is the minimum mass m so the system will
remain at rest when it is released from rest? A) 3.6 kg B) C) 2.1 3.3 kg 26) A kg D) 1.3 kg force of 30 N stretches a very light ideal spring 0.73 m from equilibrium. What is the
force constant (spring constant) of the spring?
A) 46 N/m
B) 41 N/m
C) 34 N/m
D) 22 N/m 5 25) 26) 27) An 27) 28) A 28) object attached to a spring is pulled across a horizontal frictionless surface. If the
force constant (spring constant) of the spring is 45 N/m and the spring is stretched by
0.88 m when the object is accelerating at 1.4 m/s2, what is the mass of the object?
A) 36 kg
B) 24 kg
C) 28 kg
D) 31 kg
3.0-kg brick rests on a perfectly smooth ramp inclined at 34° above the horizontal. The
brick is kept from sliding down the plane by an ideal spring that is aligned with the
surface and attached to a wall above the brick. The spring has a spring constant (force
constant) of 120 N/m. By how much does the spring stretch with the brick attached?
A) 360 cm
B) 14 cm
C) 24 cm
D) 240 cm
E) 36 cm 6 Answer Key
Testname: REVIEW CHAPTER 6 1) E
2) A
3) C
4) D
5) A
6) C
7) E
8) C
9) C
10) C
11) B
12) B
13) A
14) E
15) A
16) A
17) C
18) C
19) A
20) E
21) D
22) C
23) C
24) B
25) C
26) B
27) C
28) B 7

 

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