PHY101 Lab 5 Questions and complete Answers
When you whirl a rock tied to a string in a horizontal circle around your head, correct answers the string
exerts a centripetal force on the rock.
The rotational inertia of a sphere of mass m and radius r is proportional to __. correct answers m r^2
When a spinning skater extends his arms from his side to point straight out, his angular rotation
decreases, meaning he spins slower. Why? correct answers his moment of inertia increases
A ball is attached to a string and rotates in a circle. If it takes 1.00 s to complete one revolution, what is
the angular velocity of the ball? correct answers 6.28 rad/s
A mass m is tied to a string and swung in a horizontal circle of radius r; the rotational inertia of this
system is ___. correct answers m r^2
When angular momentum is conserved, rotational speed correct answers decreases if the mass moves
farther from the axis of rotation
The rotational inertia of an object depends on the correct answers mass of the object and its distribution
with respect to the axis of rotation.
A centripetal force is one that is correct answers directed toward the center of curvature of the path of a
moving object.
As a spinning ice skater pulls her arms in toward her body, her correct answers rotational speed
increases due to conservation of angular momentum.
A mass of 1 kilogram is tied to a string and swung in a horizontal circle of radius 1 meter. If the mass is
then decreased to 0.5 kilogram, the rotational inertia of this new system will be ____ as before. correct
answers one half as much
When you whirl a rock tied to a string in a horizontal circle around your head, correct answers the string
exerts a centripetal force on the rock.
The rotational inertia of a sphere of mass m and radius r is proportional to __. correct answers m r^2
When a spinning skater extends his arms from his side to point straight out, his angular rotation
decreases, meaning he spins slower. Why? correct answers his moment of inertia increases
A ball is attached to a string and rotates in a circle. If it takes 1.00 s to complete one revolution, what is
the angular velocity of the ball? correct answers 6.28 rad/s
A mass m is tied to a string and swung in a horizontal circle of radius r; the rotational inertia of this
system is ___. correct answers m r^2
When angular momentum is conserved, rotational speed correct answers decreases if the mass moves
farther from the axis of rotation
The rotational inertia of an object depends on the correct answers mass of the object and its distribution
with respect to the axis of rotation.
A centripetal force is one that is correct answers directed toward the center of curvature of the path of a
moving object.
As a spinning ice skater pulls her arms in toward her body, her correct answers rotational speed
increases due to conservation of angular momentum.
A mass of 1 kilogram is tied to a string and swung in a horizontal circle of radius 1 meter. If the mass is
then decreased to 0.5 kilogram, the rotational inertia of this new system will be ____ as before. correct
answers one half as much
