Recent content by klandestine

Thank you Fermat. I guess I was doing the problem right all along, I just didn't trust myself. Thanks :!)

Substituting gives these two equations: 3I1+2I3=1 I1+2I3=1 The problem is when I try to subtract these equations I get: 2I1=0 How can the current be zero?

I did have that equation. It is the first equation I listed on my first post. I tried to substitute using it, but too much keeps cancelling.

I have attached a picture of a circuit. I am trying to find the values of I1, I2, and I3. What I have come up with so far, using Kirchhoff's Voltage and Junction Laws is: I2=I1+I3 for the left loop: 9V - (5 ohms)I1 -4V - (10 ohms)I2 = 0 which simplifies to: 1V - (1 ohm)I1 - (2...

I have attached a picture of a circuit. I am trying to find the values of I1, I2, and I3. What I have come up with so far, using Kirchhoff's Voltage and Junction Laws is: I2=I1+I3 for the left loop: 9V - (5 ohms)I1 -4V - (10 ohms)I2 = 0 which simplifies to: 1V - (1 ohm)I1 - (2 ohms)I2 =...

here are my forces: where the beam meets the wall - friction (up) normal (right) on the beam I have Wp and Wb pointing down and the normal force of the professor pointing up on the far right, I have the tension which has a both an up (T_y) and a left (T_x) pointing component. But I feel...

Would this equation be the net torque of the system (which equals zero)?

I've attached a picture of the problem I am referring to. The pulley is placed so that the string makes a 45.0-degree angle with the beam. The beam is uniform, 5.00 meters long, and has weight w_{b}. The professor stands 2.00 meters from the pivot point and has weight w_{p}. First, I am...

Yes, that makes perfect sense. So, the wall can push or pull in whatever direction it is needed. But, who is to say which direction it is needed? Could I say that the wall exerts whatever force is needed to make the torque zero? I really appreciate your help, I have a much better...

Do you literally mean any direction? And, would this 'transformable' force concept be applicable to non-rotational dynamics problems? For example, when I am writing the net forces in the x and y directions, do I include the force ofthe wall? Or, is this force only associated with torque?

...and another... The third part of this question asks me to find the y-component of force that the wall exerts on the beam (F), using the axis shown. I don't understand how the nomal force of the wall could have a y-component, since according to my free body diagram, it is simply a strictly...

Thank you, Doc Al. Would it be appropriate to extend your advice a general "rule": If a force passes through a particular point in a system, then it will not exert a torque on that point. Also, could you tell me how to enter mathematical symbols when posting - I couldn't really glean...

but that doesn't take into account gravity

This problem is regarding the attached jpeg. I am supposed to find the tension in the cable. I know that since the setup is in equilibrium, all net forces and torques equal zero. So, Since net F(x) = 0, Tcos@ = F and net F(y) = 0, Tsin@ = g(m1+m2) @=theta F=the normal...

ah-ha! thank you! so, if i wanted to know the velocity of a point at a more arbitrary location, i would have to use trigonometry, right?