If I understand you correctly rock.freak667, I got the torques right hence there is some downward force of 510.12 Newtons acted at the elbow. But why does the elbow feel this force downwards? I didn't understand your explanation.
Homework Statement
A human holds a ball of mass 8kg at his hand, so that the forearm is perpendicular to the upperarm.
The distance between the elbow and the center of mass of the forearm is 0.15 meters, the distance between the elbow and the muscle is 0.05 meters and the mass of the forearm...
I checked it and the only distance x between consecutive pieces that could sustain equilibrium is, infact, 1 meter.
Weirdly the book says the sum of forces is 30N and acted in distance 0.57 meters (wasn't able to read from where).
The sum of forces is zero. Weird...
If I am not mistaken, these are the forces acting on the system:
Suppose the weight acts at distance d from the left.
Relative to the left:
$$1*(-10)+2*20+d*(-20)+7*(-30)+8*N_2=0
-180+8N_2-20d=0$$
$$N_2=22.5+2.5d$$
Relative to the right...
1- Weird, I triple checked and still didn't write this part. The pole weighs 20N.
2 - This is also another worrysome result I got.
I tried to solve it with 20N force downwards acted somewhere on the pole; my attempt was very cubersome and also failed, so I thought posting this one first is a...
Homework Statement
A horizontal pole is made of 8 pieces, 1 meter apart each. Forces that do not act at the ends are shown in the picture.
The pole does not rotate, and weighs 20N.
a. What is the sum of forces applied on the pole?
b. Where is it applied?
c. What are the forces at the ends...
I was reading he could possibly have transmitter at his shoe; he did take a look at the bill. But I'd like more thoughts on this one; I just don't buy it.