Question

*PLEASE HURRY ITS FOR A QUIZ*

Which of the following have angular momentum? Choose all that apply.

A. A stationary Ferris wheel

B. The wheels of a bike riding down the street

C. The blades of a fan that is turned on

D. A child sitting on a moving merry-go-round

Answer 1

The correct answers are :
B. The wheels of a bike riding down the street
C. The blades of a fan that is turned on
D. A child sitting on a moving merry-go-round

Let's see why. Keep in mind that the angular momentum is defined as

`L=mvr`
where m is the mass of the rotating object, v its velocity and r the radius of the circular trajectory.

A. stationary Ferris wheel --> this one has no angular momentum, because its velocity is zero (the wheel is stationary), so v=0 and the angular momentum is zero: L=0

B. The wheels of a bike riding down the street --> this one has angular momentum, because the edge of the wheel is moving with speed v

C. The blades of a fan that is turned on --> this one also has angular momentum, because the fan is moving as well

D. A child sitting on a moving merry-go-round --> also this one has angular momentum, which is given by

`L=mvr`
where m is the child mass, v its velocity and r the radius of the merry-go-round.