Physics Shitchapter 10

suzie spacewalker hovers in space beside a rotating space station in outer space. both she and the center of mass of the space station are at relative rest. if the space station is in earth orbit, then suzie a. is also in earth orbit b. is not in earth orbit c. may or may not be in earth orbit

a

what is the direction of the force that acts on clothes in the spin cycle of a washing machine? a.inward b. downward c. outward d. up

a

which has greater angular speed, a horse near the outside rail of a merry go-round or a horse near the inside rail? a. neither-they both have the same angular speed b. the inside horse c, the outside horse

a

which of the following is NOT a unit of rotational spped? a. meters per second b. revolutions per minute c. revolutions per second d. rotations per second e. rotations per minute

a

Which has greater linear speed, a horse near the outside rail of a merry go round or a horse near the inside rail? a. the inside horse b. the outside horse c. neither- they both have the same linear speed

b

a game room is in a rotating space habitat that is located in a 0.25 g region. If a person can jump 0.5 high in s 1-g region, how high can the same person jump in the game room? a. 0.5 m b. 2 m c. 4 m d. 8 m e. more than 8 m

b

a space habitat is designed so that the variation on g between a person's head and feet is less than 0.01 g. if the person is 2 m tall, then the radius of the habitat is a. 20 m b. 200 m c. 2000 m d. more than 2000 m

b

as the rotational speed of a space habitat increases, the weight of people inside a. decreases b. increases c. stays the same

b

if earth rotated more slowly about its axis, your weight would a. decrease b. increase c. stays the same

b

if you whirl a tin can on the end of the string and the string suddenly breaks, the can will a. fly directly away from you b. fly off, tangent to its circular path c. fly directly toward you d. sprial in toward your hand e. spiral away from your hand

b

nellie newton swings a rock into a circular path while holding an attached string overhead. The string makes a 45 degree angle to the vertical . The centripetal force that holds the rock in its circular path is the a. vertical component of the string tension b. horizontal component of the string tension c. tension in the string d. none of the above

b

the rotational speed of a wheel is defined as the number of rotations it makes in a unit of time

T

centrifugal forces are an apparent reality to observers in a reference frame that is a. rotating b. an internal reference frame c. moving at constant velocity d. at rest e. none of the above

a

stunt motorcyclist biker bob rides his bike inside a futuristic rotating space station a giant rotating donut shaped structure in space. the normal support force fells like weight to him. as he rides his bike in the same direction that the station rotates, the normal force a. remains unaffected b. increases c. decreases

b

when a railroad train rounds a banked track, the centripetal force needed comes not from friction, but from the a. vertical component b. horizontal component of the normal force c. normal force d. none of the above

b

a car travels in a circle with constant speed. the net force on the car a. is zero because the car is not accelerating b. is directed forward, in the direction of travel c. is directed toward the center of the curve. d. none of the above

c

people in the future may well live inside a rotating space structure that is more than 2 km in diameter. Inside the structure, people on the inside of the outer edge will experience 1 g while people halfway to the axis will experience. a. 2g b 1g c 1/2 g d 1/4g e 0g

c

stunt motorcyclist biker bob rides his bike inside a futuristic rotating space station- a giant rotating donut shaped structure in space. the normal support force feels like weight to him. as he rides his bike in the opposite direction to the stations rotation, the normal force a. remains unaffected b. increases c. decreases

c

the centripetal force exerted on stunt motorcyclist biker bob while riding on the inner vertical surface of a circular track is a. friction b. his weight c. the normal force d. none of the above

c

to weigh less in the northern hemisphere, you should go a. west b. east c. south d. north

c

a ladybug rests on the bottom of a tin can that is being whirled horizontally on the end of a string. since the ladybug, like the can, moves in a circle, there must be a force on it. what exerts this force? a. gravity b. the string c. there is no force acting on it d.the can e. your hand

d

a person weighs less at the equator than at the poles. the reason for this has to do with the a. tidal bulges b. influence of the sun, moon, and all the planets c. higher temperature at the equator. and expansion of matter d. spin of the earth e. none of the above

d

a tin can whirled on the end of a string moves in a circle because a. the can contunially pulls on the string b.once the can starts moving, that is its natural tendencey c. there is a force on the can pulling it outward d. there is an inward force acting on the can e. all the above

d

earth rotates and revolves through space. earth rotates about the _____, which is an _____ axis. Earth revolves about the ______, which is an _______ axis

d

a possible space habitat of the future is a cylinder in space rotating about its long axis. what is the relative gravitational field along the axis of the habitat? a. one-quarter g b. one half g c. three quarters g d. g e. zero

e

a bug on a turning phonograph record will make more turns per minute if it is located toward the center of the record

f

the only reason riders on a rotating platform in a carnival dont fall out is because they are strapped in

f

when an object turns about an external axis, the motion is called rotation

f

a straight line about which rotation takes place is called axis

t

any force that causes an object to move in a ciricular path is called a centripetal force

t

it is possible to rotate a very large cylindrical space habitat around its central axis at just the right speed so people living inside a cylinder will experience a force that feels like gravity

t

ladybugs on the inside of a spinning bicycle tire can experience a force that feels like gravity to them

t

when you whirl a can on the end of a string, the centripetal force on the can is actually the pull of the string on the can

t