Recent content by MicahP

I got it, that helped me along. What was throwing me off was that for some reason I thought I needed to know how many lines there were. Thanks!

Homework Statement Consider an array of parallel wires with uniform spacing of 1.40 cm between centers. In air at 20.0°C, ultrasound with a frequency of 35.6 kHz from a distant source is incident perpendicular to the array. (Take the speed of sound to be 343 m/s.) (a) Find the number of...

what is this answer choices: a. Primitive cubic with an octahedral hole b. Body centered cubic with an octahedral hole c. Face centered cubic with an octahedral hole d. None of the above e. Not enough information to determine We didn't talk about this in class, and this was a question...

Homework Statement Homework Equations Ʃτ = 0 τ = rFsinθ The Attempt at a Solution I'm not even really sure where to start with this. My first thought was that it's not moving, so presumably the forces sum to 0. I also thought of treating the point where the net is exerting...

:o Oh wow, I can't believe I didn't think of that I_iω_i = I_fω_f (400)(2.5) = (3400)ω_f ω_f = .29 thanks, all

Okay...I have spent an inordinate amount of time trying to figure this out, and I still don't follow... :frown:

Okay, here's what I tried: v_t = rω 5 m/s = (2m)ω ω = 2.5 rad/s I_iω_i = I_fω_f (3000)ω_i = (400)(2.5) ω_i = 0.333 rad/s which wasn't right (but was one of the answer choices), and then I thought (3000)ω_i = (3400)(2.5) ω_i = 2.8333 rad/s which...also isn't right. I feel like...

Homework Statement Water falls onto a water wheel causing it to rotate. Consider an instant when the water wheel is initially motionless and then 100 kg of water hits tangent to the wheel at a radius of 2 m (this water can be treated like a point mass). If the moment of inertia of the water...