Physics Chapter 8

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Seattle Central College *

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100

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Physics

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Jan 9, 2024

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pdf

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Uploaded by ProfOyster2999

Name: Score: 20 Multiple choice questions Term What is the simulated gravitational field strength half-way between the axis of the Earth and the outside edge where the field strength is g? zero g one-half g three-quarters g 1 of 20 Term An industrial flywheel has a greater rotational inertia when most of its mass is nearest the rim. nearest the axis. uniformly spread out as in a disk. 2 of 20 Term The center of gravity of a circular disk of sheet metal is at the center of the disk. midway between the center and the outside. two-thirds of the way between the center and the outside. impossible to predict without knowing the metal density. 3 of 20

Term Consider a rotating donut-shaped space habitat where living quarters are on the inside surface farthest from the axis. If the rotational speed of the habitat increases, the apparent weight of people inside increases. decreases. stays the same. is always zero. 4 of 20 Term The long, heavy tail of a spider monkey enables the monkey to easily vary its weight. momentum. inertia. center of gravity. none of these 5 of 20 Term 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 two. four. eight. 6 of 20

Term 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 Earth. inside the Earth, but off center. outside the Earth, but within the orbital path of the moons. outside the Earth, but beyond the orbital path of the moons. 7 of 20 Term 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 doubles. halves. remains the same 8 of 20 Term Two people are balanced on a seesaw. If one person leans toward the center of the seesaw, that person's end of the seesaw will rise. fall. stay at the same level. rise and then fall. fall and then rise. 9 of 20

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Term ) A baseball bat is balanced on a fulcrum. The center of gravity of the bat is located closer to the handgrip. above the fulcrum. near the heavy end. 10 of 20 Term The famous Leaning Tower of Pisa doesn't topple over because its center of gravity is above a place of support. relatively low for such a tall building. stabilized by its structure. displaced from its center. in the same place as its center of mass. 11 of 20 Term A 1-kg rock is suspended from the tip of a meter stick at the 0-cm mark so that the meter stick balances like a seesaw when the fulcrum is at the 25-cm mark. From this information, what is the mass of the meter stick? 1/4 kg 1/2 kg 3/4 kg 1 kg more than 1 kg 12 of 20

Term A torque acting on an object tends to produce equilibrium. rotation. linear motion. velocity. a center of gravity. 13 of 20 Term When a twirling ice skater brings her arms inward, her rotational speed increases. decreases. remains the same. 14 of 20 Term 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 less and your tangential speed more. more and your tangential speed less. the same and your tangential speed less. 15 of 20

Term For a system in mechanical equilibrium the resultant force must be zero. the resultant torques must be zero. the resultant forces and torques must both be zero. the resultant forces and torques must be equal. 16 of 20 Term Suppose you put very large-diameter tires on your car. Then, your speedometer will show a speed that is higher than it is actually. lower than it is actually. the same as before 17 of 20 Term A ball rolls down a hill mainly because of an unbalanced torque. a balanced torque. its rotational inertia. its angular acceleration. its angular momentum. 18 of 20

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Privacy Terms Term A flywheel's diameter is twice that of another of the same shape and mass. The larger flywheel's rotational inertia is four times the other's. two times the other's. the same as the other's. half the other's. 19 of 20 Term On a balanced seesaw, a boy three times as heavy as his partner sits 1/3 the distance from the fulcrum. less than 1/3 the distance from the fulcrum. more than 1/3 the distance from the fulcrum. 20 of 20 English (USA)

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