1.ΚΚΚΚΚΚΚΚ A boy holds a bird in his hand.Κ The reaction force (Newtonβs third law) to
the normal force exerted on the bird by the boy's hand is the force of the
ΚΚΚΚΚΚΚΚΚΚΚ A)ΚΚΚΚΚΚΚ earth
on the bird.
ΚΚΚΚΚΚΚΚΚΚΚ B)ΚΚΚΚΚΚΚ bird
on the earth.
ΚΚΚΚΚΚΚΚΚΚΚ C)ΚΚΚΚΚΚΚ hand
on the bird.
ΚΚΚΚΚΚΚΚΚΚΚ D)ΚΚΚΚΚΚΚ bird
on the hand.
ΚΚΚΚΚΚΚΚΚΚΚ E)ΚΚΚΚΚΚΚΚ earth
on the hand.
ΚΚΚΚΚΚΚΚΚΚΚ
2.ΚΚΚΚΚΚΚΚ A force F produces an acceleration a on
an object of mass m.Κ A force 3F is
exerted on a second object, and an acceleration 8a results.Κ What is the mass of the second object?
ΚΚΚΚΚΚΚΚΚΚΚ A)ΚΚΚΚΚΚΚ 3m
ΚΚΚΚΚΚΚΚΚΚΚ B)ΚΚΚΚΚΚΚ 9m
ΚΚΚΚΚΚΚΚΚΚΚ C)ΚΚΚΚΚΚΚ 24m
ΚΚΚΚΚΚΚΚΚΚΚ D)ΚΚΚΚΚΚΚ (3/8)m
ΚΚΚΚΚΚΚΚΚΚΚ E)ΚΚΚΚΚΚΚΚ (8/3)m
ΚΚΚΚΚΚΚΚΚΚΚ
ΚΚΚΚΚΚΚΚΚΚΚ
3.ΚΚΚΚΚΚΚΚ A mass of 25 kg is acted on by two
forces: F1 is 15 N due east, and F2 is 10 N
due north.Κ The acceleration of the mass
is
ΚΚΚΚΚΚΚΚΚΚΚ A)ΚΚΚΚΚΚΚ 0.72
m/s2, 56.3Ό north of east.
ΚΚΚΚΚΚΚΚΚΚΚ B)ΚΚΚΚΚΚΚ 0.20
m/s2, due east.
ΚΚΚΚΚΚΚΚΚΚΚ C)ΚΚΚΚΚΚΚ 0.72
m/s2, 33.7Ό north of east.
ΚΚΚΚΚΚΚΚΚΚΚ D)ΚΚΚΚΚΚΚ 1.0
m/s2, 33.7Ό north of east.
ΚΚΚΚΚΚΚΚΚΚΚ E)ΚΚΚΚΚΚΚΚ 0.20
m/s2, 56.3Ό north of east.
ΚΚΚΚΚΚΚΚΚΚΚ
4.ΚΚΚΚΚΚΚΚ A mass m is traveling at an initial
speed v0 = 25.0 m/s.Κ It is
brought to rest in a distance of 62.5 m by a force of 15.0 N.Κ The mass is
ΚΚΚΚΚΚΚΚΚΚΚ A)ΚΚΚΚΚΚΚ 37.5
kg
ΚΚΚΚΚΚΚΚΚΚΚ B)ΚΚΚΚΚΚΚ 3.00
kg
ΚΚΚΚΚΚΚΚΚΚΚ C)ΚΚΚΚΚΚΚ 1.50
kg
ΚΚΚΚΚΚΚΚΚΚΚ D)ΚΚΚΚΚΚΚ 6.00
kg
ΚΚΚΚΚΚΚΚΚΚΚ E)ΚΚΚΚΚΚΚΚ 3.75
kg
ΚΚΚΚΚΚΚΚΚΚΚ
5.ΚΚΚΚΚΚΚΚ A body of weight w is in free fall near
the surface of the earth. What force does the body exert on the earth?
ΚΚΚΚΚΚΚΚΚΚΚ A)ΚΚΚΚΚΚΚ w
ΚΚΚΚΚΚΚΚΚΚΚ B)ΚΚΚΚΚΚΚ greater
than w
ΚΚΚΚΚΚΚΚΚΚΚ C)ΚΚΚΚΚΚΚ less
than w
ΚΚΚΚΚΚΚΚΚΚΚ D)ΚΚΚΚΚΚΚ 9.81w
ΚΚΚΚΚΚΚΚΚΚΚ E)ΚΚΚΚΚΚΚΚ zero
ΚΚΚΚΚΚΚΚΚΚΚ
ΚΚΚΚΚΚΚΚΚΚΚ
6.ΚΚΚΚΚΚΚΚ If a force F is required to extend a
spring by 20 cm, what force is required to extend it by 30 cm?
ΚΚΚΚΚΚΚΚΚΚΚ A)ΚΚΚΚΚΚΚ F
ΚΚΚΚΚΚΚΚΚΚΚ B)ΚΚΚΚΚΚΚ (2/3)F
ΚΚΚΚΚΚΚΚΚΚΚ C)ΚΚΚΚΚΚΚ (3/2)F
ΚΚΚΚΚΚΚΚΚΚΚ D)ΚΚΚΚΚΚΚ 600F
ΚΚΚΚΚΚΚΚΚΚΚ E)ΚΚΚΚΚΚΚΚ (3/5)F
ΚΚΚΚΚΚΚΚΚΚΚ
ΚΚΚΚΚΚΚΚΚΚΚ
7.ΚΚΚΚΚΚΚΚ A 5-kg object undergoes a displacement Δs
= 2i + 3j. During the displacement, a constant force F = 4i
φ 2j acts on the object. All values are given in SI units. The work done
by the force F on this object is
ΚΚΚΚΚΚΚΚΚΚΚ A)ΚΚΚΚΚΚΚ 8
J
ΚΚΚΚΚΚΚΚΚΚΚ B)ΚΚΚΚΚΚΚ φ6
J
ΚΚΚΚΚΚΚΚΚΚΚ C)ΚΚΚΚΚΚΚ 2
J
ΚΚΚΚΚΚΚΚΚΚΚ D)ΚΚΚΚΚΚΚ 14
J
ΚΚΚΚΚΚΚΚΚΚΚ E)ΚΚΚΚΚΚΚΚ φ2
J
ΚΚΚΚΚΚΚΚΚΚΚ
ΚΚΚΚΚΚΚΚΚΚΚ
8.ΚΚΚΚΚΚΚΚ What is the power output needed from a
motor to lift, in the absence of friction, a mass of 1.5 α 104 kg a
vertical distance of 25 m in 6.0 s at constant speed?
ΚΚΚΚΚΚΚΚΚΚΚ A)ΚΚΚΚΚΚΚ 2.0
α 106 W
ΚΚΚΚΚΚΚΚΚΚΚ B)ΚΚΚΚΚΚΚ 6.1
α 105 W
ΚΚΚΚΚΚΚΚΚΚΚ C)ΚΚΚΚΚΚΚ 2.2
α 104 W
ΚΚΚΚΚΚΚΚΚΚΚ D)ΚΚΚΚΚΚΚ 8.3
α 105 W
ΚΚΚΚΚΚΚΚΚΚΚ E)ΚΚΚΚΚΚΚΚ 3.1
α 105 W
ΚΚΚΚΚΚΚΚΚΚΚ
ΚΚΚΚΚΚΚΚΚΚΚ
9.ΚΚΚΚΚΚΚΚ A 5200-kg cable car in Hong Kong is
pulled a distance of 360 m up a hill inclined at 12Ό from the horizontal.Κ The change in the potential energy of the
car is
ΚΚΚΚΚΚΚΚΚΚΚ A)ΚΚΚΚΚΚΚ 1.8
α 107 J
ΚΚΚΚΚΚΚΚΚΚΚ B)ΚΚΚΚΚΚΚ 1.2
α 107 J
ΚΚΚΚΚΚΚΚΚΚΚ C)ΚΚΚΚΚΚΚ 3.8
α 106 J
ΚΚΚΚΚΚΚΚΚΚΚ D)ΚΚΚΚΚΚΚ 6.0
α 107 J
ΚΚΚΚΚΚΚΚΚΚΚ E)ΚΚΚΚΚΚΚΚ 1.8
α 106 J
ΚΚΚΚΚΚΚΚΚΚΚ
ΚΚΚΚΚΚΚΚΚΚΚ
10.ΚΚΚΚΚΚΚ A block with a mass M = 4.85 kg is
resting on a slide that has a curved surface.Κ
There is no friction.Κ The speed
of the block after it has slid along the slide sufficiently far for its
vertical drop to be 19.6 m is
ΚΚΚΚΚΚΚΚΚΚΚ A)ΚΚΚΚΚΚΚ 19.6
m/s
ΚΚΚΚΚΚΚΚΚΚΚ B)ΚΚΚΚΚΚΚ 384
m/s
ΚΚΚΚΚΚΚΚΚΚΚ C)ΚΚΚΚΚΚΚ 73
m/s
ΚΚΚΚΚΚΚΚΚΚΚ D)ΚΚΚΚΚΚΚ 43.2
m/s
ΚΚΚΚΚΚΚΚΚΚΚ E)ΚΚΚΚΚΚΚΚ The
problem cannot be solved because the shape of the curved slide is not given.
ΚΚΚΚΚΚΚΚΚΚΚ
ΚΚΚΚΚΚΚΚΚΚΚ
11.
The worldβs largest Ferris wheel with a radius of 50.0 m is located in Yokohama
City, Japan.ΚΚ Each of the sixty
gondolas on the wheel takes 1.00 minute to complete one revolution when at full
speed.
a.
What is the uniform speed of a gondola when the Ferris wheel is at full speed?
b.
What is the acceleration of the gondola when at uniform full speed?
c.
A 70 kg rider in one gondola experiences what force from the seat as he passes
through the lowest part of his ride?
d. Another
rider, at 50 kg, experiences what force from her seat as she passes through the
top of her ride?
e. How
many seconds is required for one revolution of the wheel so that a rider at the
top would experience no force from his seat?
12.
A 300 N force is applied horizontally to a 60 kg crate at rest on a horizontal
frictionless surface.
a.
If the force persists for a distance of travel of 20.0 m, how much work is done
on the crate by the force?
b.
What is the final speed of the crate?
c.
At that point, what coefficient of friction (from that point forward) would be
required to keep the crate moving at constant speed under the action of the 300
N force?
d.
Draw a free body diagram of the situation in part c (above).
e.
Then, upon removal of the 300 N force, over what final distance does the crate
slow to a stop?