Problem statements
Solution video – H3.A
Solution video – H3.B
Reminder: Please submit HW3.B. No credit will be given for submitting the wrong homework assignment.
DISCUSSION THREAD
Please post questions here on the homework, and take time to answer questions posted by others. You can learn both ways.
Hello,
Is the “d” a constant or a value of measurement?
I think it’s just an unknown that would cancel out in the calculations.
Hello,
For part a), is F_ac the magnitude of vector AC? So F_ac = 5.477?
F_AC is unknown, so final answer has to left in terms of F_AC. It is NOT the magnitude of the position vector r_AC.
Hi,
I am also confused as to how we are meant to use F_ac without knowing any force components. We aren’t supposed to just write F_acx are we? Any help is appreciated.
F_AC is unknown, so final answer has to left in terms of F_AC.
I’m using the definition of the force vector (F_AC) to be the magnitude of Tension (T_AC) times the unit vector U_AC.
F_AC = T_AC * U_AC
This lets me take out the T_AC “known” and simplify my other calculations. You can calculate proj_AD F_AC with (F_AC dot U_AD) times U_AD, so the T_AC constant can just be multiplied across the result.
My final answer is just some decimals multiplied by i and j, 0 k, and the entire vector multiplied by the scalar T_AC.
Not entirely sure if this is correct, though.