Recent content by Becca93

Change in guitar string tension - Please help? Homework Statement A particular guitar string is supposed to vibrate at 220 Hz, but it is measured to actually vibrate at 225 Hz. By what percentage should the tension in the string be changed to get the frequency to the correct value? Do not...

Ahh, yes, I see what I did. I did mess up the algebra without noticing. I had it straight in my head but not on paper. Thank you very much for pointing that out for me. I've got the correct answer now.

I realized that not long after I asked. I'm now assuming it's a trick question. 0 is the correct answer. I think it was trying to show that because distance from the center of mass was zero, all the rest was zero as well.

Homework Statement A circular disk with a rectangular hole has a radius of 0.600 m and mass of 0.390 kg. It is suspended by a point on its perimeter as shown in the figure. The moment of inertia about this point is I_p = 2.60E-1 kgm2. Its center of mass is located at a distance of s=0.120 m...

How? I did the following: √((ω^2 - ωo^2)^2) Shouldn't the square root and the square cancel, leaving (ω^2 - ωo^2) ω^2 - (√k/m)^2 ω^2 - (k/m) Resulting in: ω^2 = √((Fo/m)/A) + (k/m) Where did I go wrong?

Homework Statement Damping is negligible for a 0.139 kg mass hanging from a light 7.00 N/m spring. The system is driven by a force oscillating with an amplitude of 1.88 N. At what frequency will the force make the mass vibrate with an amplitude of 0.430 m? There are two possible solutions...

I have no idea. I'll try to work this out in the morning. It's getting pretty late here too. Goodnight! Thank for the advice. I'll take that into account when I try again.

Okay, I understand that I need to use cos instead of sin, but I still don't understand what to do without the length of the beam.

Would it be τ = (T1-T1)rsinθ then? What else is wrong?

Yes, that does make sense. Where else did I go wrong here?

Shouldn't T2 be equal to m2's weight plus the effect the acceleration of the system has on it? It doesn't make sense to me for it to be only the weight of gravity since the system is accelerating left.

I worked it through with the guy that runs the math help center. To be honest, even I'm confused by my own workings. But as for symbols, I use alpha for angular acceleration, a for linear acceleration, and g for acceleration due to gravity. I think I need to start this question over from...

:redface: Do you ever have one of those moments where you just can't believe you mixed up something really simple? Thank you very much for pointing that out. I feel a bit foolish, but I do have the right answer now.

Homework Statement A 26.6 kg beam is attached to a wall with a hinge and its far end is supported by a cable. The angle between the beam and the cable is 90°. If the beam is inclined at an angle of theta=13.3° with respect to horizontal, what is the horizontal component of the force exerted...

I tried both, but when whittled down to the required three sigfigs, the answer is still 0.398 rad/s. I'm at a loss as to what to do differently.