Is a tape dispenser a pulley or a wheel and axis?

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

Suppose a soccer ball is kicked from the ground at an angle 20.0º above the horizontal at 8.00 m/s. the y-velocity is determined to be 2.74 m/s. how long will the ball be in the air? assume the ball lands at the same height at which it was kicked.

What energy transformations occur each time the skateboarder rolls up the ramp?