Multiple Choice Questions

To kick a football so it won't topple end over end, kick it so the force of impact extends
  • above a place of support
  • through its center of gravity
  • quadruples the tension in the string
  • greater than toward the center
A carnival has a Ferris wheel where the seats are located halfway between the center and outside rim. If you were at the outside rim, your angular speed while riding on this Ferris wheel would be
  • remains the same, but the RPMs decrease
  • greater than toward the center
  • at the center of the Earth.
  • the same and your tangential speed more
The center of gravity of a circular disk of sheet metal is
  • at the center of the disk
  • at the center of the Earth.
  • above a place of support
  • at its geometrical center
If a turntable's rotational speed is doubled, then the linear speed of a pet hamster sitting on the edge of the record will
  • rotates faster.
  • doubles
  • double
  • wide handle.
Your pet hamster sits on a record player whose angular speed is constant. If he moves to a point twice as far from the center, then his linear speed
  • increase
  • doubles
  • decreases
  • sphere
Centrifugal forces are an apparent reality to observers in a reference frame that is
  • τ =10 Nm
  • rotating
  • rotation.
  • the resultant forces and torques must both be zero.
Calculate the torque produced by a 52-N perpendicular force at the end of a 0.20-m-long wrench.
  • τ =10 Nm
  • τ =15 Nm
  • τ =0 Nm
  • τ =90 Nm
Suppose you're on a Ferris wheel at a carnival, seated 10 m from the Ferris wheel's axis. If you make a complete rotation each minute, your linear speed is
  • 62.13 m/min.
  • 62.8 m/min.
  • 63.8 m/min.
  • 310.8 m/min.
Rotational inertia about the midpoint of an object becomes greater with _______.
  • greater than toward the center
  • quadruples the tension in the string
  • directed toward the center of the curve
  • increased mass and increased distance to mass concentration
The chef at the infamous Fattening Tower of Pizza tosses a spinning disk of uncooked pizza dough into the air. The disk's diameter increases during the flight, while its rotational speed
  • decreases
  • increase
  • doubles
  • increases
When a twirling ice skater brings her arms inward, her rotational speed
  • doubles
  • decreases
  • increases
  • increase
Toss a baseball bat into the air and it wobbles about its
  • near the outside
  • External torque
  • wide handle.
  • center of mass
Neglecting air resistance, which will roll from rest to the bottom of an incline first, an empty jar, or the same jar filled with peanut butter?
  • rotates faster.
  • 62.8 m/min.
  • the filled jar
  • is the disk
If the Earth had two identical moons in one circular orbit, and the moons were as far apart in that orbit as they could be, the center of gravity of the Earth-moons system would be
  • at the center of the disk
  • at the center of the Earth.
  • above a place of support
  • rotates faster.
The center of gravity of a basketball is located _______.
  • greater than toward the center
  • at its geometrical center
  • above a place of support
  • at the center of the disk
A car travels in a circle with constant speed. The net force on the car is
  • greater than toward the center
  • directed toward the center of the curve
  • increased mass and increased distance to mass concentration
  • 1/3 the distance from the fulcrum
The tangential speed on the outer edge of a rotating carousel is _______.
  • at its geometrical center
  • greater than toward the center
  • at the center of the disk
  • above a place of support
Suppose you are at the center of a large freely-rotating horizontal turntable in a carnival funhouse. As you crawl toward the edge, the angular momentum of you and the turntable
  • greater than toward the center
  • at the center of the Earth.
  • 62.8 m/min.
  • remains the same, but the RPMs decrease
Which moves faster in m/s on a merry-go-round: a horse on the inside or a horse on the outside near the outer rail?
  • doubles
  • wide handle.
  • outside horse
  • External torque
A ring and a disk, initially at rest, roll down a hill together. The one to reach the bottom first
  • is the disk
  • sphere
  • increase
  • above the fulcrum
Calculate the angular momentum of the person if the force of friction that keeps a 90-kg person sitting on the edge of a horizontal rotating platform when the person sits 2.1m from the center of the platform and has a tangential speed of 4.0m/s .
  • L = 380 kg⋅m2s
  • L = 760 kg⋅m2s
  • L = 760 kg⋅m0s
  • L = 860 kg⋅m2s
To turn a stubborn screw, it is best to use a screwdriver that has a
  • increases
  • wide handle.
  • External torque
  • near the outside
Put a pipe over the end of a wrench when trying to turn a stubborn nut on a bolt, to effectively make the wrench handle twice as long, you'll multiply the torque by
  • 62.8 m/min.
  • two
  • doubles
  • double
A baseball bat is balanced on a fulcrum. The center of gravity of the bat is located
  • above a place of support
  • above the fulcrum
  • near the outside
  • is the disk
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Multiple Choice Questions
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