PHYS 250 FINAL EXAM CORRECT
100%
Consider two children sitting on a merry-go-round, with one closer to the outer edge
and one closer to the center.
Which child has a greater angular speed? - ANSWERThey both have the same
angular speed.
When a violin string is plucked, which of the following occurs when the string is
displaced by its greatest amount? - ANSWERpotential energy is maximum and
kinetic is minimum
"Noise cancelling headphones" are a kind of headphones which decrease the
amount of background noise that get into your ears when you wear them.
On what physical phenomena do these headphones depend on? -
ANSWERdestructive interference
Object A and B have identical size and shape, but Object A has a much higher
density. The two objects are completely submerged in water.
Consider two equal masses M attached to the ends of massless rods, of length R, as
shown in the figure. Treat the two masses as point masses, each located at a
distance R from the point where the rods touch.
What is the moment of inertia of this system, about an axis perpendicular to the page
and passing through the point where the rods touch? - ANSWER2MR^2
Consider the three objects shown in water. The wood floats while the aluminum and
the steel sink. The wooden and aluminum blocks are the same size. The aluminum
and steel blocks have equal mass and the density of steel is greater than the density
of aluminum.
Which object has the greatest buoyancy force on it? - ANSWERThe aluminum
A mass is connected to a spring and is allowed to move horizontally. The mass is at
a position L when the spring is unstretched. The mass is then moved, stretching the
spring, and released from rest. It then moves with simple harmonic motion.
Part (a) At the instant that the mass passes through the position where the spring is
unstretched, what can be said about its instantaneous acceleration?
Part (b) At the instant that the mass passes through the position where the spring is
unstretched, what can be said about its instantaneous speed?
Part (c) At the instant that the spring is compressed the most, what can be said
about the magnitude of its instantaneous velocity? - ANSWER(a) It is zero.
100%
Consider two children sitting on a merry-go-round, with one closer to the outer edge
and one closer to the center.
Which child has a greater angular speed? - ANSWERThey both have the same
angular speed.
When a violin string is plucked, which of the following occurs when the string is
displaced by its greatest amount? - ANSWERpotential energy is maximum and
kinetic is minimum
"Noise cancelling headphones" are a kind of headphones which decrease the
amount of background noise that get into your ears when you wear them.
On what physical phenomena do these headphones depend on? -
ANSWERdestructive interference
Object A and B have identical size and shape, but Object A has a much higher
density. The two objects are completely submerged in water.
Consider two equal masses M attached to the ends of massless rods, of length R, as
shown in the figure. Treat the two masses as point masses, each located at a
distance R from the point where the rods touch.
What is the moment of inertia of this system, about an axis perpendicular to the page
and passing through the point where the rods touch? - ANSWER2MR^2
Consider the three objects shown in water. The wood floats while the aluminum and
the steel sink. The wooden and aluminum blocks are the same size. The aluminum
and steel blocks have equal mass and the density of steel is greater than the density
of aluminum.
Which object has the greatest buoyancy force on it? - ANSWERThe aluminum
A mass is connected to a spring and is allowed to move horizontally. The mass is at
a position L when the spring is unstretched. The mass is then moved, stretching the
spring, and released from rest. It then moves with simple harmonic motion.
Part (a) At the instant that the mass passes through the position where the spring is
unstretched, what can be said about its instantaneous acceleration?
Part (b) At the instant that the mass passes through the position where the spring is
unstretched, what can be said about its instantaneous speed?
Part (c) At the instant that the spring is compressed the most, what can be said
about the magnitude of its instantaneous velocity? - ANSWER(a) It is zero.
