In this video, the linear motion of the descending sphere is directly related to the rotational motion of the wheel, and in order to complete our calculations we will need to identify this connection. what is the relationship between the linear acceleration a of the descending sphere and the angular acceleration α of the rotating wheel?

Explanation:

Let a is the linear acceleration of the descending sphere. It is given by,

.......(1) (change in velocity)

Let is the  angular acceleration α of the rotating wheel. It is given by :

............(2) (change in angular velocity)

Dividing equation (1) and (2) we get :

Since,

Hence, this is the required solution.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.