Recent content by jamesweston0

Hey all. I know this is a basic concept but I don't really understand it. I don't get what the difference between rank and dimension is. According to my book, the rank of a matrix is the dimension of the column space. Does that not imply that they are the same, unless the question...

You got it rock.freak667! Kind of a weird question since it didn't say anything about friction. It's not in the friction chapter either. It's a few chapters later. I guess they expect us to use ideas from previous chapters even without making mention of them. Thanks!

Any new ideas?

Yeah lol this is really confusing for me too. It doesn't seem to be very hard but something is obviously not clicking.

Hmm I though 10lb is referring to a force not a mass in this case. Regardless, gsin45 = a is not working out. 32.2sin45 = 22.77 ft/s^2 The real answer is 9.62 ft/s^2.

Well the 10sinθ is the force of gravity down the ramp. Also, yes I'm assuming the plane is smooth. It doesn't say anything to lead me to believe there's friction.

FNormal = 10cosθ Fparallel = 10sinθ Just sub in 30 and 45 for θ. What else is there to use?

It seems to be an easy question but for some reason I can't figure it out. Homework Statement If the 10 lb block A slides down the plane with a constant velocity when θ = 30°, determine the acceleration of the block when θ = 45°. Homework Equations F = ma The Attempt at a...

Thanks for all your guys' help! I really appreciate it.

Wow that was wicked. Thanks kuruman! I'm really learning a lot here. I have two little questions left if it is okay with you. I'm kind of confused about this. It doesn't really seem intuitive. Can you explain the difference between why friction would do positive work in some cases but...

Thanks a lot kuruman. I just have a couple questions regarding your method if you don't mind. I just use mgh to figure these out for their respective blocks? I find the height using trig and multiply it by the mass and gravity, right? Okay I'm kind of confused here. Calculating the...

Oops yeah I screwed up there. But the answer is actually 10.1 kW.

Homework Statement The material hoist and the load have a total mass of 600 kg and the counterweight C has a mass of 150 kg. If the upward speed of the hoist increases uniformly from to 0.9 m/s to 2.3 m/s in 2 s, determine the average power generated by the motor M during this time. The...

Hmm okay. I'm still having trouble grasping this because I feel like I have already used the 0.5 earlier. But your way is working so what can you do. Thanks a lot for your help rl. Do you think you could lay out a method to do this with work/energy? Thanks again.

But that is the acceleration of A isn't it? The a is equal to the acceleartion of B, and 0.5a is equal to the acceleration of A. So that whole equation was set to equal 0.5a since a was already the acceleration of B. Not sure if that made sense.