Everything looks fine so far (except that the final vector should be .08i etc if the numbers are correct).
For the elbow angle: did they specify which frame the elbow is measured against? If it is the angle between say the shoulder and wrist, where the angle would be 180 degrees if your arm...
I'm not sure how your paper was graded, but maybe you got it wrong because of a little confusion in units and terminology?
The force of her movement is her body's mass moving at a constant acceleration, not velocity. Also the greatest acceleration would be 8.82 m/s^2. I can't see a mistake...
The total field at D can just be considered as the field from particle A + the field from particle B. So the total equation is just E = 2 * k * Q / x^2
Maybe De Moivre's Theorem is useful here? Not sure if that's what you meant by expanding as real and imaginary parts.
[cos(theta) + i*sin(theta)]^n = cos(n*theta) + i*sin(n*theta)
Instead of taking the axis of rotation in the midpoint of the string T2, take it at the right side. The length of the attaching string is still L. Doing this eliminates the torques -T3cos(theta)*L and 50N*L. The resulting equation is simply T1cos(phi)*L-40N*L=0. You know phi, and L cancels out...
The x component of the tensions provide no torque on the string because they act through our chosen axis of rotation.
Looking back now, the problem might be solved easier if you chose the axis of rotation at one of the endpoints of T2, so you can cancel one of the tensions entirely. In fact...
If all of the forces are acting on the ends of the string T2, then they are all equidistant from the center of the string. That distance L does not matter, however, because the net torque is zero allowing you to cancel out the common factor L.
If the system is in equilibrium then two statements must be true:
The sum of the torques must be zero,
and the sum of the forces must be zero.
The lengths of everything do not matter; If you choose your axis of rotation along the line connecting the two blocks then your torque equation is...
Long time reader here! I am really interested in Physics and plan to study and major in it in some sort in college. I wanted to ask if anyone has any suggestions for medium to large sized colleges that have good professors or studies in the field of physics or the sciences. I am not looking for...
eh
If you give infinity a number such as 4444444444_ ( _ being repeating infinitely), this number could be infinitely large so that it could not be discounted as a defined number. But if you multiply that set of 4's by 2 you would get an infinite string of 8's. I am not sure if this somehow...
I have a lab that needs a graph, and my calculations seem logical, but I need some affirmation. In this lab we spun a string with a stopper attached at one end and some weights at the other end. We had to keep a part of the string at the same point while spinning and therefore it moved at a...