Slide 1

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Circular Motion
A 1200-kilogram car
traveling at a constant
speed of 9.0 m/s turns
at an intersection. The
car follows a horizontal
circular path with a radius
of 25 meters to point P. At
point P, the car hits an area of ice and loses
all frictional force on its tires. Which path
does the car follow on the ice?
A) A
B) B
C) C
D) D
A ball attached to
a string is moved at
constant speed in a
horizontal circular
path. A target is located near the path
of the ball as shown in the diagram. At
which point along the ball’s path
should the string be released, if the
ball is to hit the target?
A) A
B) B
C) C
D) D
An artificial satellite makes 4
complete revolutions about the
Earth in 8 hours. The period of
revolution of the satellite is
A) ½ hour
B) 2 hours
C) 8 hours
D) 32 hours
Centripetal
Acceleration
&
Force
If the velocity of a car traveling
around a circular track doubles,
its centripetal acceleration would
be
A) 1/2 as great
B) 2 times greater
C) 1/4 as great
D) 4 times greater
The diagram below shows the elliptical
orbit of a comet around the Sun.
The magnitude of the centripetal
acceleration of the comet is greatest at
point
A) A B) B
C) C D) D
A car moves with a
constant speed in a
clockwise direction
around a circular
path of radius r, as
represented in the diagram above.
When the car is in the position shown,
its acceleration is directed toward the
A) north B) west C) south D) east
The magnitude of the centripetal force
acting on an object traveling in a
horizontal, circular path will decrease
if the
A) radius of the path is increased
B) mass of the object is increased
C) direction of motion of the object is
reversed
D) speed of the object is increased
The centripetal force acting on the
space shuttle as it orbits Earth is
equal to the shuttle’s
A) inertia
B) momentum
C) velocity
D) weight
Centripetal force Fc acts on a car
going around a curve. If the speed of
the car were twice as great, the
magnitude of the centripetal force
necessary to keep the car moving in
the same path would be
A) Fc
B) 2Fc
C) Fc/2
D) 4Fc
The diagram below
represents a mass, m,
being swung clockwise
at constant speed in
a horizontal circle. At the instant
shown, the centripetal force acting
on mass m is directed toward point
A) A
B) B
C) C
D) D
A 0.50-kilogram object moves in a
horizontal circular path with a radius of
0.25 meter at a constant speed of 4.0 m/s.
What is the magnitude of the object’s
acceleration?
A) 8.0 m/s2
B) 16 m/s2
C) 32 m/s2
D) 64 m/s2
A 0.50-kilogram object moves in a
horizontal circular path with a radius of
0.25 meter at a constant speed of 4.0 m/s.
What is the magnitude of the object’s
centripetal force?
A 0.40-kilogram stone is attached to a
string. The stone is moving at a
constant speed of 4.0 m/s in a
horizontal circle with a radius of 0.80
m. The magnitude of the centripetal
acceleration of the stone is
A) 0.0 m/s2
B) 2.0 m/s2
C) 5.0 m/s2
D) 20. m/s2
A 2.0 × 103-kilogram car travels at a
constant speed of 12 m/s around a circular
curve of radius 30 meters. What is the
magnitude of the centripetal acceleration
of the car as it goes around the curve?
A) 0.40 m/s2
B) 4.8 m/s2
C) 800 m/s2
D) 9,600 m/s2
In an experiment, a
0.028-kilogram rubber
stopper is attached to
one end of a string. A
student whirls the stopper
overhead in a horizontal
circle with a radius of
1.0 meter. The stopper completes 10
revolutions in 10 seconds. Calculate the
magnitude of the angular speed or
frequency of the stopper.
In an experiment, a
0.028-kilogram rubber
stopper is attached to
one end of a string. A
student whirls the stopper
overhead in a horizontal
circle with a radius of
1.0 meter. The stopper completes 10
revolutions in 10 seconds. Calculate the
magnitude of the linear or tangential speed
of the whirling stopper.
In an experiment, a
0.028-kilogram rubber
stopper is attached to
one end of a string. A
student whirls the stopper
overhead in a horizontal
circle with a radius of
1.0 meter. The stopper completes 10
revolutions in 10 seconds. Calculate the
magnitude of the centripetal acceleration of
the whirling stopper.
In an experiment, a
0.028-kilogram rubber
stopper is attached to
one end of a string. A
student whirls the stopper
overhead in a horizontal
circle with a radius of
1.0 meter. The stopper completes 10
revolutions in 10 seconds. Calculate the
magnitude of the centripetal force on the
whirling stopper.
A mass of 10 kilograms is
revolving at a linear speed of 5
meters per second in a circle
with a radius of 10 meters.
What is the frequency or
angular speed (rps) of the mass?
A mass of 10 kilograms is
revolving at a linear speed of 5
meters per second in a circle
with a radius of 10 meters.
What is the centripetal
acceleration of the mass is
A mass of 10 kilograms is
revolving at a linear speed of 5
meters per second in a circle
with a radius of 10 meters. The
centripetal force acting on the
mass is
A) 5 N
C) 20 N
B) 10 N
D) 25 N
A 1750-kilogram car travels at a
constant speed of 15.0 m/s around a
horizontal, circular track with a
radius of 45.0 meters. The magnitude
of the centripetal acceleration of the
car is
A 1750-kilogram car travels at a
constant speed of 15.0 m/s around a
horizontal, circular track with a
radius of 45.0 meters. The magnitude
of the centripetal force acting on the
car is
Universal Gravitational Laws
As the distance between two
objects increases, the gravitational
force of attraction between them
will
A) decrease
B) increase
C) remain the same
The diagram below
Shows four
different locations
of a satellite in its
elliptical orbit about Earth. At
which location is the magnitude
of the satellite’s velocity greatest?
A)A
B) B
C) C
D) D
Spacecraft S is traveling
from planet P1 toward
planet P2 At the position
shown, the magnitude of
the gravitational force of planet P1 on the
spacecraft is equal to the magnitude of the
gravitational force of planet P2 on the spacecraft.
If distance X is greater than distance Y, then the
mass of P1 must be
A) less than the mass of P2
B) greater than the mass of P2
C) equal to the mass of P2
The diagram below shows
the movement of a planet
around the Sun. Area 1
equals area 2. Compared
to the time the planet takes to move from C
to D, the time it takes to move from A to B is
A) less
B) greater
C) the same
A satellite is in geosynchronous
orbit. Compared to Earth’s
period of rotation, the satellite’s
period of revolution is
A) less
B) greater
C) the same
The shapes of the paths of the planets
about the Sun are all
A) circles with the Sun at the center
B) circles with the Sun off center
C) ellipses with the Sun at the center
D) ellipses with the Sun at one focus
Base your answer
to the following
question on
the diagram
below which
represents the orbit of a comet about
the Sun. As the comet moves from point
A to point B, its potential energy
A) decreases
B) increases
C) remains the same
The comet Hyakutake, seen in the
Earth's sky in 1996, will take more than
10,000 years to complete its orbit.
Which object is at a focus of the comet's
orbit?
A) Earth
B) Sun
C) Moon
D) Jupiter
As the planet moves from
point B to point C, how do
its kinetic energy and
potential energy change?
A) Its kinetic energy decreases, and its
potential energy decreases.
B) Its kinetic energy decreases, and its
potential energy increases.
C) Its kinetic energy increases, and its
potential energy decreases.
D) Its kinetic energy increases, and its
potential energy increases.
What is the magnitude of the
gravitational force between two
5.0-kilogram masses separated by
a distance of 5.0 meters?
A) 5.0 × 10 N
–10
B) 3.3 × 10 N
C) 6.7 × 10 –11 N
D) 1.3 × 10 –11 N
0
An astronaut weighs 8.00 × 102
Newton’ on the surface of Earth.
What is the weight of the astronaut
6.37 × 106 meters above the surface
of Earth (2 radii total)?
A) 0.00 N
B) 2.00 × 102 N
C) 1.60 × 103 N
D) 3.20 × 103 N
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