Jeopardy

1
Jeopardy
Centripetal Force
Rotation Revolution
Speed Frequency
Misc.
Misc. 2
Q 100
Q 100
Q 100
Q 100
Q 100
Q 200
Q 200
Q 200
Q 200
Q 200
Q 300
Q 300
Q 300
Q 300
Q 300
Q 400
Q 400
Q 400
Q 400
Q 400
Q 500
Q 500
Q 500
Q 500
Q 500
Final Jeopardy
2
100 Question from Centripetal Force
(True or False) When you whirl a can on the end
of a string, the centripetal force on the can is
actually the pull of the string on the can.
3
100 Answer from Centripetal Force
(True or False) When you whirl a can on the end
of a string, the centripetal force on the can is
actually the pull of the string on the can.
4
200 Question from Centripetal Force
(True or False) Any force that causes an object
to move in a circular path is called a
centripetal force.
5
200 Answer from Centripetal Force
(True or False) Any force that causes an object
to move in a circular path is called a
centripetal force.
6
300 Question from Centripetal Force

• A string with a rock on the end makes a conical
  pendulum, the centripetal force that holds the
  rock in its circular path is the
• Vertical component of the string tension
• Horizontal component of the string tension
• Tension in the string

7
300 Answer from Centripetal Force

• A string with a rock on the end makes a conical
  pendulum, the centripetal force that holds the
  rock in its circular path is the
• Vertical component of the string tension
• Horizontal component of the string tension
• Tension in the string

8
400 Question from Centripetal Force

• When a railroad train rounds a banked track, the
  centripetal force needed comes not from friction,
  but from the
• Horizontal component of the normal force.
• Vertical component of the normal force
• Normal force
• None of the above

9
400 Answer from Centripetal Force

• When a railroad train rounds a banked track, the
  centripetal force needed comes not from friction,
  but from the
• Horizontal component of the normal force.
• Vertical component of the normal force
• Normal force
• None of the above

10
500 Question from Centripetal Force

• The centripetal force exerted on stunt
  motorcyclist Biker Bob while riding on the inner
  vertical surface of a circular track is
• Friction
• His weight
• the normal force
• None of the above

11
500 Answer from Centripetal Force

• The centripetal force exerted on stunt
  motorcyclist Biker Bob while riding on the inner
  vertical surface of a circular track is
• Friction
• His weight
• the normal force
• None of the above

12
100 Question from Rotation Revolution
(True or False) A straight line about which
rotation takes place is called an axis.
13
100 Answer from Rotation Revolution
(True or False) A straight line about which
rotation takes place is called an axis.
14
200 Question from Rotation Revolution
(True or False) The rotational speed of a wheel
is defined as the number of rotations it makes in
a unit of time.
15
200 Answer from Rotation Revolution
(True or False) The rotational speed of a wheel
is defined as the number of rotations it makes in
a unit of time.
16
300 Question from Rotation Revolution
You sit at the outer rim of a Ferris wheel that
rotates at 9 RPM . What would your rotational
speed be if you were instead clinging to a
position halfway from the center to the outer rim?
17
300 Answer from Rotation Revolution
You sit at the outer rim of a Ferris wheel that
rotates at 9 RPM . What would your rotational
speed be if you were instead clinging to a
position halfway from the center to the outer
rim? 9 RPM
18
400 Question from Rotation Revolution

• Earth rotates and revolves through space. Earth
  rotates about the _______, which is and ________
  axis.
• Sun, external
• Sun, internal
• North/South pole, external
• North/South pole, internal

19
400 Answer from Rotation Revolution

• Earth rotates and revolves through space. Earth
  rotates about the _______, which is an ________
  axis.
• Sun, external
• Sun, internal
• North/South pole, external
• North/South pole, internal

20
500 Question from Rotation Revolution

• Earth rotates and revolves through space. Earth
  revolves about the _______, which is and ________
  axis.
• Sun, external
• Sun, internal
• North/South pole, external
• North/South pole, internal

21
500 Answer from Rotation

• Earth rotates and revolves through space. Earth
  revolves about the _______, which is an ________
  axis.
• Sun, external
• Sun, internal
• North/South pole, external
• North/South pole, internal

22
100 Question from Speed Frequency

• Which of the following is NOT a unit of
  rotational speed?
• Rotations per minute
• Meters per second
• Revolutions per minute
• Revolutions per second
• Rotations per second

23
100 Answer from Speed Frequency

• Which of the following is NOT a unit of
  rotational speed?
• Rotations per minute
• Meters per second
• Revolutions per minute
• Revolutions per second
• Rotations per second

24
200 Question from Speed Frequency

• Which has the greater linear speed, a horse near
  the outside rail of a merry-go-round or a horse
  near the inside rail?
• The inside horse
• Neither they have the same linear speed.
• The outside horse

25
200 Answer from Speed Frequency

• Which has the greater linear speed, a horse near
  the outside rail of a merry-go-round or a horse
  near the inside rail?
• The inside horse
• Neither they have the same linear speed.
• The outside horse

26
300 Question from Speed Frequency
Hamlet, a hamster, runs on his exercise wheel,
which turns around once every 0.5 s. What is the
frequency of the wheel?
27
300 Answer from Speed Frequency
Hamlet, a hamster, runs on his exercise wheel,
which turns around once every 0.5 s. What is the
frequency of the wheel? 2 Hz f 1/T f 1/0.5
s f 2Hz
28
400 Question from Speed Frequency
The tangential speed at the outer rim of a Ferris
wheel is 12m/s. What is the tangential speed of a
position halfway from the center to the outer rim?
29
400 Answer from Speed Frequency
The tangential speed at the outer rim of a Ferris
wheel is 12m/s. What is the tangential speed of a
position halfway from the center to the outer
rim? 6m/s
30
500 Question from Speed Frequency
A CD disk spins with a frequency of 1800
revolutions per minute, what is the period of
spin of the compact disc?
31
500 Answer from Speed Frequency
A CD disk spins with a frequency of 1800
revolutions per minute, what is the period of
spin of the compact disc? 0.034 sec T 1/f T
1/1800 (60)
32
100 Question from Misc.

• What is the direction of the force that acts on
  clothes in the spin cycle of a washing machine?
• Outward
• Inward
• Up
• Down

33
100 Answer from Misc.

• What is the direction of the force that acts on
  clothes in the spin cycle of a washing machine?
• Outward
• Inward
• Up
• Down

34
200 Question from Misc.
A basketball court in space is in a 0.25-g
region. If a player can jump 0.5-m high in a 1-g
region, how high can the same player jump in the
basketball court?
35
200 Answer from Misc.
A basketball court in space is in a 0.25-g
region. If a player can jump 0.5-m high in a 1-g
region, how high can the same player jump in the
basketball court? 4 m
36
300 Question from Misc.

• A tin can whirled on the end of a string moves in
  a circle because
• Once the can starts moving, that is its natural
  tendency.
• There is a force on the can pulling it outward
• There is an inward force acting on the can

37
300 Answer from Misc.

• A tin can whirled on the end of a string moves in
  a circle because
• Once the can starts moving, that is its natural
  tendency.
• There is a force on the can pulling it outward
• There is an inward force acting on the can

38
400 Question from Misc.

• A person weighs less at the equator than at the
  poles. The reason for this has to do with the
• Tidal bulges
• Higher temperature at the equator
• Influence of the sun
• Spin of the Earth

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400 Answer from Misc.

• A person weighs less at the equator than at the
  poles. The reason for this has to do with the
• Tidal bulges
• Higher temperature at the equator
• Influence of the sun
• Spin of the Earth

40
500 Question from Misc.
If your arm is 0.60 m long, what is the minimum
speed with which you can swing a pail so that the
water doesnt spill out at the top of the path?
41
500 Answer from Misc.
If your arm is 0.60 m long, what is the minimum
speed with which you can swing a pail so that the
water doesnt spill out at the top of the
path? ac v2/r 10m/s2 v2/.60m (.60m)(10m/s2)
v2 6 v2 v 2.45 m/s
42
100 Question from Misc. 2

• A space habitat is designed so that the variation
  is g between a persons head and feet is less
  than 0.04g. If the person is 4m tall, then the
  radius of the habitat is
• 100 m
• 10 m
• More than 1000 m
• 1000 m

43
100 Answer from Misc. 2

• A space habitat is designed so that the variation
  is g between a persons head and feet is less
  than 0.04g. If the person is 4m tall, then the
  radius of the habitat is
• 100 m
• 10 m
• More than 1000 m
• 1000 m

44
200 Question from Misc. 2
At the outer edge of a rotating space habitat,
140 m from its center, the rotational
acceleration is g. What is the rotational
acceleration of 70m from the center of the
habitat?
45
200 Answer from Misc. 2
At the outer edge of a rotating space habitat,
140 m from its center, the rotational
acceleration is g. What is the rotational
acceleration of 70m from the center of the
habitat? ½ g
46
300 Question from Misc. 2
Who is moving a greater linear speed? Jessica at
8.0 m from the center or Julie at 6.0 m from the
center?
47
300 Answer from Misc. 2
Who is moving a greater linear speed? Jessica at
8.0 m from the center or Julie at 6.0 m from the
center? Jessica
48
400 Question from Misc. 2
What is the centripetal acceleration of Julie if
she is 6.0 m from the center and turns around
once every 40.0s?
49
400 Answer from Misc. 2
What is the centripetal acceleration of Julie if
she is 6.0 m from the center and turns around
once every 40.0s? ac v2/r 0.15 m/s2
50
500 Question from Misc. 2
A vertical pole standing against a wall topples
to the ground and the center of the pole has a
speed of 15m/s as it hits. With what speed does
the far end of the pole hit the ground?
51
500 Answer from Misc. 2
A vertical pole standing against a wall topples
to the ground and the center of the pole has a
speed of 15m/s as it hits. With what speed does
the far end of the pole hit the ground? 30m/s
twice as far out so twice as fast
52
Final Jeopardy

• To weigh less in the Northern Hemisphere, you
  should go
• South
• West
• North
• East

53
Final Jeopardy Answer

• To weigh less in the Northern Hemisphere, you
  should go
• South
• West
• North
• East