Chapter 9 Questions Flashcards
horses with the greatest linear velocity on a merry-go-round located
near the outside
which horse moves faster in m/s on a merry go-round
one near the outer rail
compared with a force, a torque involves
a rotation, leverage, a distance from an axis of rotation
a torque acting on an object tends to produce
rotation
a difference between linear momentim and angular momentum involves
a radial distance and two type of velocity
multiply the equation for linear momentum by radial distance and you have
angular momentum
a swimming area in a rotating space habitat is located in a region of 1/4-g. if a diver can jump 1 m high in a 1-g region, how high can the same diver jump in the swimming area?
4, 1*4/1
if the rotational velocity of a rotating habitat in space increases the weight experienced by occupants
increases
a solitary boy cannot balance on a seesaw with its fulcrum at the midpoint. If the fulcrum is moved closer to the boy, balance is achieved when the weight of the boy
more than the weight of the see saw
if youre on a Ferris wheel at a carnival, seated 10 m from the ferris wheel axis that makes a complete rotation each minute, your linear speed is
62.8 m/min
v=rw
(10)(2*3.14)
as you crawl toward the edge of a freely-rotating horizontal turntable in a carnival funhouse, the angular momentum of you and the turntable
remains the same, but revs decrease
what are the units for tangential speed? rotational?
meters per second, rpm
a tapered cup rolled on a flat surface makes a circular path. what does this tell you about the tangential speed of the rim of the wide end vs. narrow end
wide end has greater tangential speed than the narrow end
what is rotationa inertia and how is to inertia
rotational inertia is the resistance to a change in rotational mortion
as distance increases b/w mass of an object and center of rotation, dores rotational inertia increase or decrease?
increases with increasing distance
which is easier to get swining, a baseball at the narrow end or massive end
massive end
which will habe a greater acceleration rolling down a hill, a hoop or solid disk?
a solid disk has less rotational inertia and will have greater acceleration
what is mean by the lever arm of a torque
the lever arm is the shortest distance between the applied force and rotational axis
if you toss a stick into the air, it appears to wobble, about what place does it wobble
center of motion
