Recent content by dcmf

Hi all, I really appreciate the insight. I think I'm still having a little trouble grasping the rationale behind the ranking but I think I'm going to go find my teacher and ask for further clarifications when she's available later in the week cause I think I've spent far too long on this one...

I feel like I have considered both, though. Point 1 suggests that I1 = I3 due to the placement of the axes. Point 2 suggests that I2 > I4 due to the orientation of the cups. However I am still having trouble figuring out how to place I1 and I3 relative to I2 and I4 (i.e. I1=I3 > I2 > I4 or...

I fully agree. I do not plan to compute any of these inertias. However, I'm pretty sure I need to use the inertia equations to compare each situation. My confusion stems from the nonconventional shape of the glued paper cups (larger radius at the rims, smaller radius at the base) and how to...

Figure 1: I assume this is a conceptual question regarding the usage of the above inertia equations but the axes are really confusing me. I would imagine that around I1 and I3, you could say that the total inertia is just the sum of all the ring-shaped "slices" of the paper cups (i.e. use the...

I just noticed that you may have updated your reply. Would it be appropriate to use the work as defined in the first part of the question that asks "How much work W does the motor do on the platform during this process?"

In class, we actually did not address work or power in the context of problems involving rotation. This homework question seems to to be presented like a way to self-learn the material, but we were not provided with an equation to work with, so I assumed I should use the P=W/Δt equation. I'm...

This question has multiple parts and according to all the work done up to this point... How much work W does the motor do on the platform during this process? 1885 J What is the rotational kinetic energy of the platform Krot,f at the end of the process described above? 1885 J What is the...

I had a really poorly done sketch so I omitted it 😳 The numbers didn't look right to me either though. But I just have terrible intuition with math and it didn't click that dividing by a decimal should result in a bigger number :') Thank you

Thanks for the input. You're absolutely correct, there was a calculation error there but that results in about 985.2N, but I think the answer needs about 2 significant figures so there's still (at least what seems to me) a discrepancy between the two values. Also is 3s really not being used...

Here's a picture the question provided. I tried solving this question two ways (assuming the axis of rotation is at the shoulder joint) and am getting wildly different answers. Some potential reasons there's a discrepancy: - I'm not super confident about my use of the torque equation...

Haha I see it! Thank you so much 🤡

Here's the picture of the situation described, provided by the question. Here's a screenshot of the work I have done. Here's a screenshot of the submission screen. The issue is that I have one attempt left and am not sure what I am doing wrong. Based on the hints, I feel like I'm...

I most definitely have not encountered rigid vs deformable systems yet. Your explanation makes a lot of sense though, thank you very much!

A diagram is also provided, which looks like this: I'm not sure what is correct and after doing some digging online I still haven't been able to come to a consensus. I'm currently stuck between one of two possibilities: positive or zero. I'm pretty sure work on A (Wa) and work on B (Wb) are...

Hi all, thank you for your replies. When you both said you're getting a different number doing the same calculation, I realized my calculator has been in radians and not degrees this entire time 🤡 Thanks for your patience and help :')