Help with Moments Question Part II

[omairt2001]

Hi

can someone please do part ii) of this moments question. Just can't get my head round it. Thnx!


http://img150.echo.cx/img150/872/physicspaper0128xk.jpg
http://img150.echo.cx/img150/1093/p...paper0130ot.jpg

 

[OlderDan]

Hi

can someone please do part ii) of this moments question. Just can't get my head round it. Thnx!


http://img150.echo.cx/img150/872/physicspaper0128xk.jpg
http://img150.echo.cx/img150/1093/p...paper0130ot.jpg

What is part 2? Nothing comes up at the link

 

[omairt2001]

lemme repost the second link here it is

http://img150.echo.cx/img150/1093/physicspaper0130ot.jpg

 

[whozum]

Do you know the answer to (i)? If so, try drawing a free body diagram for situation (i), and one for situation (ii), you'll notice something about the net force and torque in each case.

 

[omairt2001]

not really

 

[whozum]

When is force Q = 0?
Why does it decrease as he walks away?

 

[omairt2001]

i don't know. i just don't get moments.

 

[adamc637]

Maybe you should read up on it a little. The hints they give you are pretty helpful.

Think about calculating torque around a point that will yield a simple equation and then use a couple of those equations to get an expression for Q.