can anyone PLEASE help me with a quick torque problem?

[Gnyc123]

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I have no idea why they get .5...I thought torque is always measured from the center???

Please help! =)

 

[Gnyc123]

So since it hits just right of the center...wouldn't it be a reallly small value??

 

[Gnyc123]

 

[Mantis Toboggin]

Take the center of the target as the fulcrum. The passage specifically states that the diameter is 1 meter. Therefore the radius is 0.5m.

The question stem states that it hits directly right of the center, at the edge. The intention is to make you think that it hit the length of the radius. That's how you ascertain the "r" for bullet one.

I'm assuming you get the rest of the question, if you need help with that let me know.

 

[Cawolf]

Oh I see what you were thinking. The problem states it kind of weird, but since it "grazes" the target it has to be striking almost exactly at the radius. If we take the center of the target to be the axis of rotation, then the first bullet is striking with force F0 at a distance R=0.5m. So the torque exerted by the first bullet is (0.5m)F0.

Oops I see Mantis said pretty much the same thing....well....you can probably solve the rest easily.

 

[Gnyc123]

I understand thanks a lot!