A child sits on a merry-go-round at the position marked by the red circle (position is in meters and time is in seconds). What is her angular displacement after 0.44 seconds given in radians? Start

A child sits on a merry-go-round at the position marked by the red circle (position is in meters and time is in seconds). What is her angular speed? Start

A quarter and a penny rest on a turntable as shown in the animation. Which coin has the greater angular speed? Start

Interactive Hint

A child sits on a merry-go-round at the position marked by the red circle (position is in meters and time is in seconds). What is her angular acceleration? Start

A wheel rolls as shown in the animation (position of the center of mass and position of a a point on the edge of the wheel are shown in meters and time is shown in seconds). What is the velocity of a point on the edge of the wheel when it is at the highest point (with respect to the floor)? Start

A wheel rolls without slipping while pulled by a string wrapped around its circumference as shown in the animation (position is given in meters and time is in seconds). Which animation properly depicts the physical situation?

Start Animation 1                      Start Animation 3
Start Animation 2                      Start Animation 4

The animation depicts an idealized drivetrain for a bicycle. A large green disk (i.e. a flat cylinder) is used to rotate a small green disk of the same density and thickness via a massless chain that does not slip (position of a point on the edge of each disk is shown in meters and time is shown in seconds). What is the ratio of the kinetic energy of the green disk to the kinetic energy of the red disk (K_green/ K_red)? Start

A 1 kg object moves down the blue incline and onto the black table---which is frictionless---as shown in the animation  (position is in meters and time is in seconds). Determine from the motion of the object whether or not it rolls or slides down the blue incline and whether the object could be a disk, a hoop, or a sphere. Start

A 1 kg object moves down the blue incline and onto the black table---which is frictionless---as shown in the animation  (position is in meters and time is in seconds). Determine from the motion of the object whether or not it rolls or slides down the blue incline and whether the object could be a disk, a hoop, or a sphere. Start