Physics 1114 OCCC

b) Bobby has the greater magnitude of velocity.

A merry-go-round is rotating at constant angular speed. Two children are riding the merry-go-round: Ana is riding at point A and Bobby is riding at point B. Which child moves with greater magnitude of velocity? a) Ana has the greater magnitude of velocity. b) Bobby has the greater magnitude of velocity. c) Both Ana and Bobby have the same magnitude of velocity.

b) The acceleration is perpendicular to v⃗ A and directed toward the inside of the track.

A road race is taking place along the track shown in the figure . All of the cars are moving at constant speeds. The car at point F is traveling along a straight section of the track, whereas all the other cars are moving along curved segments of the track. Let v⃗ A be the velocity of the car at point A. What can you say about the acceleration of the car at that point? a) The acceleration is parallel to v⃗ A. b) The acceleration is perpendicular to v⃗ A and directed toward the inside of the track. c) The acceleration is perpendicular to v⃗ A and directed toward the outside of the track. d) The acceleration is neither parallel nor perpendicular to v⃗ A. e) The acceleration is zero.

D, F

Assuming that all cars have equal speeds, which car has the acceleration of the greatest magnitude, and which one has the acceleration of the least magnitude?

a) yes

Can a car be moving with a constant speed of 100 km/h and still be accelerating? a) yes b) no

b) The acceleration is perpendicular to v⃗ C and pointed toward the inside of the track.

Let v⃗ C be the velocity of the car at point C. What can you say about the acceleration of the car at that point? a) The acceleration is parallel to v⃗ C. b) The acceleration is perpendicular to v⃗ C and pointed toward the inside of the track. c) The acceleration is perpendicular to v⃗ C and pointed toward the outside of the track. d) The acceleration is neither parallel nor perpendicular to v⃗ C. e) The acceleration is zero.

c) The acceleration is perpendicular to v⃗ D and pointed toward the outside of the track.

Let v⃗ D be the velocity of the car at point D. What can you say about the acceleration of the car at that point? a) The acceleration is parallel to v⃗ D. b) The acceleration is perpendicular to v⃗ D and pointed toward the inside of the track. c) The acceleration is perpendicular to v⃗ D and pointed toward the outside of the track. d) The acceleration is neither parallel nor perpendicular to v⃗ D. e) The acceleration is zero.

e) The acceleration is zero.

Let v⃗ F be the velocity of the car at point F. What can you say about the acceleration of the car at that point? a) The acceleration is parallel to v⃗ F. b) The acceleration is perpendicular to v⃗ F and pointed toward the inside of the track. c) The acceleration is perpendicular to v⃗ F and pointed toward the outside of the track. d) The acceleration is neither parallel nor perpendicular to v⃗ F. e) The acceleration is zero.

b) Bobby has the greater magnitude of centripetal acceleration.

Who has the greater magnitude of centripetal acceleration? a) Ana has the greater magnitude of centripetal acceleration. b) Bobby has the greater magnitude of centripetal acceleration. c) Both Ana and Bobby have the same magnitude of centripetal acceleration.

c) Both Ana and Bobby have the same magnitude of angular acceleration. Both Ana and Bobby are maintaining a constant angular velocity, so they both have an angular acceleration of zero (thus they are equal)!

Who moves with greater magnitude of angular acceleration? a) Ana has the greater magnitude of angular acceleration. b) Bobby has the greater magnitude of angular acceleration. c) Both Ana and Bobby have the same magnitude of angular acceleration.

c) Both Ana and Bobby have the same magnitude of angular velocity.

Who moves with greater magnitude of angular velocity? a) Ana has the greater magnitude of angular velocity. b) Bobby has the greater magnitude of angular velocity. c) Both Ana and Bobby have the same magnitude of angular velocity.

c) Both Ana and Bobby have the same magnitude of tangential acceleration. Both Ana and Bobby are maintaining a constant speed, so they both have a tangential acceleration of zero (thus they are equal)!

Who moves with greater magnitude of tangential acceleration? a) Ana has the greater magnitude of tangential acceleration. b) Bobby has the greater magnitude of tangential acceleration. c) Both Ana and Bobby have the same magnitude of tangential acceleration.

Which of the following is the greatest angle: a) 3Pi/2 rad b)5Pi/8 rad c) 220 degree

a) 3Pi/2 rad

Uniform circular motion requires: a) centripetal acceloration b) angular speed c) tangential velocity d) both (a) and (b)

a) centripetal acceloration

Viewed from above, a turntable rotates counterclockwise. The angular velocity vector is then: a) tangential to the turntable's rim b) out of the plane of the turntable c) counterclockwise d) none of the proceeding

b) out of the plane of the turntable

The unit of angular speed is: a) rad b) s-1 c) s d) rad/rpm

b) s-1

The radian unit is a ratio of: a) a degree/time b) length c) length/length d) length/time

c) length/length

For the polar coordinates of a particle traveling in a circle, the variables are: a) both r and theta b) only r c) only theta d) none of the proceeding

c) only theta

The particles in a uniformly rotating object all have the same: a) angular acceleration b) angular speed c) tangential velocity d) both (a) and (b)

d) both (a) and (b)

In the circular motion, there is a: a) constant velocity b) constant angular velocity c) zero acceloration d) nonzero tangential acceleration

d) nonzero tangential acceleration

The frequency unit of hertz is equivalent to: a) that of the period b) that of the cycle c) radian/s d) s-1

d) s-1