Chapter 8- HW
C
As distance increases between most most of the mass of an object and its center of rotation, how does the rotational inertia change? A. It stays the same B. It goes to zero C. It increases D. It decreases
B
How is flywheel constructed to maximize its rotational inertia A. Most of the mass is concentrated near the axis B. Most of the mass is concentrated far from the axis C. Most of the mass is concentrated near a ring half way between the axis and the rim D. The mass is uniformly distributed across the radius of the disk
B
If you hang at rest by your hands from a long vertical rope, where is your center of gravity with respect to the rope? A. At the end of the rope B. Somewhere straight below where your hands grab the rope C. Where you hands grab the rope D. Somewhere straight above where your hands grab the rope
A
If you toss a stick into the air, it appears to wobble al over the place. Specifically about what place does it wobble? A. It will rotate about the center of mass B. It will rotate about the place it was last touched by your hand C. It will rotate about one end
A
On a rotating turntable, how do tangential speed and rotational speed vary with distance from the center A. Tangential speed increases with distance. Rotating speed is constant B. Rotational speed increases with distance. Tangential speed is constant C. Both are constant D. Both increase in speed with distance
A
The tangential speed on the outer edge of a rotating carousel is A. Greater than toward the center B. Less than toward the center C. Four times as great for twice the distance D. The same as towards the center
D
What does a torque tend to do to an object A. Torque tends to increase the linear speed of the object B. Torque tends to decrease the rotational inertia of the object C. Torque tends to increase the rotational inertia of the object D. Torque tends to twist or change the state of rotation of the object
B
What is meant by the term "lever arm" of a torque? A. The angle between the applied force vector and the rotational axis B. The perpendicular distance from the rotational axis to the line along which the force acts C. The distance between the point at which a force is applied and the center of mass of an object D. The distance between the point at which a force is applied and the rotational axis
B
What is the relationship between the center of gravity and the support base for an object that is in stable equilibrium A. The center of gravity must be in the center of the support base of the object B. A vertical line through the center of gravity must pass inside the support base of the object C. A vertical line through the center of gravity must pass through the center of the support base D. The center of gravity must be below the support base
C
Which will have the greater acceleration rolling down an incline: a hoop or a solid disk? Why? A. Both will have the same acceleration because they have the same rotational inertia B. The solid disk will because it is heavier C. The solid disk will because the mass is closer to the axis of rotation D. The hoop will because the mass s furthest from the axis of rotation
A
Why can't you stand with your heels and back to a wall and then bend over to touch your toes and return to your stand up position A. A vertical line through the center of gravity of your body id in front of the tips of your toes, which is outside your support base B. Your center of gravity does not hang below your support base C. Your center of gravity is too high above your support base D. A vertical line through the center of gravity of your body is behind your heels, which is outside your support base
D
Why dormant the Leaning Tower of Pisa topple over? A. A vertical line the center of gravity passes through the center of its support base B. The center of gravity is suspended below its support base C. The center of gravity is at the center of the building D. A vertical line through the center of gravity [asses inside its support base
