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AP Physics: Unit 3 Progress Check: MCQ Part A Questions and
Answers
Planet X has a mass of MM and a radius of RR. Planet Y
has a mass of 3M3M and a radius of 3R3R. Identical
satellites orbit both planets at a distance RR above their
surfaces, as shown above. The planets are separated by
such a large distance that the gravitational forces between
them are negligible.
How does the magnitude of the gravitational force FYFY
exerted by Planet Y on its satellite compare to the
gravitational force FXFX exerted by Planet X on its
satellite? - ANSWER -FY=3/4FX
Planet X has a mass of MM and a radius of RR. Planet Y
has a mass of 3M3M and a radius of 3R3R. Identical
satellites orbit both planets at a distance RR above their
surfaces, as shown above. The planets are separated by
such a large distance that the gravitational forces between
them are negligible.
How does the gravitational field gXgX at the surface of
Planet X compare with the gravitational field gYgY at the
surface of Planet Y? - ANSWER -gX=3gY
A moon orbits a planet in a nearly circular orbit of radius
RR, as shown in the figure.
Which of the following free-body diagrams could be used
to analyze the forces exerted on the moon when it is at
the position indicated in the figure? - ANSWER -
Gravity is going toward the right
A moon orbits a planet in a nearly circular orbit of radius
RR, as shown in the figure.
The moon has a mass of 1×1022 kg1×1022 kg, and the
gravitational field strength at a distance RR from the
planet is 0.001 N/kg0.001 N/kg. What is the gravitational
force exerted on the moon while it is in orbit around the
planet? - ANSWER -1×10^19 N
A moon orbits a planet in a nearly circular orbit of radius
RR, as shown in the figure.
Astronomers making careful observations of the moon's
orbit discover that the orbit is not perfectly circular, nor is it
elliptical. Which of the following statements supports this
observation? - ANSWER -There is another celestial
body that exerts a gravitational force on the moon.
Two containers of water can have their individual masses
varied by adding or removing water. The containers are
initially a distance dd apart, as measured from their
centers, and are filled with water so that each has a mass
MM, as shown in Figure 1 above. The gravitational force
that one container exerts on the other is F0F0. Water is
then added to one container so that its mass increases to
1.5M1.5M, and water is removed from the other container
so that its mass decreases to 0.5M0.5M, as shown in
Figure 2. What is the new gravitational force exerted on
one container by the other? - ANSWER -3/4F0
Satellite AA orbits a planet at a distance dd from the
planet's center with a centripetal acceleration a0a0. A
second identical satellite BB orbits the same planet at a
distance 2d2d from the planet's center with centripetal
acceleration abab. What is the centripetal acceleration
abab in terms of a0a0 ? - ANSWER -a0/4
A student must conduct two experiments so that the
inertial mass and gravitational mass of the same object
can be determined. In the experiment to find the object's
gravitational mass, the student ties one end of a string
around the object with the other end tied to a spring scale
so that the object can vertically hang at rest. In the
experiment to find the object's inertial mass, the student
uses a spring scale to pull the object, starting from rest,
across a horizontal surface with a constant applied force
such that frictional forces are considered to be negligible.
In addition to the spring scale, the student has access to
other measuring devices commonly found in a science
laboratory. Which of the following lists the essential
measuring devices the student can use to collect the data
necessary to find the object's gravitational and inertial
mass? - ANSWER -Meterstick and timer
Two experiments are conducted are conducted to
determine the mass of an object. In Experiment 1, the
object's weight is measured by using an electronic balance
once the object has been placed at rest on the balance. In
Experiment 2, the object is pulled along a horizontal
surface with a spring scale such that the force reading on
the spring scale remains constant while a motion detector
is used to measure the instantaneous speed of the object
as it is pulled. All frictional forces for both experiments are
considered to be negligible. Which of the two experiments,
if either, could be used to determine the gravitational mass
of the object? - ANSWER -Experiment 1 only
A student analyzes data of the motion of a planet as it
orbits a star that is in deep space. The orbit of the planet is
considered to be stable and does not change over time.
The student claims, "The only experimentally measurable
