# Recent content by urbano

1. ### Help to understand Newtons Law

Homework Statement I am trying to understand a diagram I have of a gymnast hanging from a bar. She weighs 50kg and is not swinging, just hanging. In the diagram it has her weight as 500N (using 10/m/s/s for gravity * 50kg) but the bar she is hanging from has an upward arrow with 550 N next to...
2. ### How is math education in the US structured ? Pre algebra , calc etc

I was trying to establish form high school up to the pint where you are about to start university, in what order are the maths classes taught. where I live they are just taught as level 1, 2 and 3. But I left school long before these were introduced so have idea what they refer to.
3. ### How is math education in the US structured ? Pre algebra , calc etc

I wanting to do some papers at university, however I have long been out of high school and never really don math or science at high school. As an adult I am now keen to pursue some math papers and was wondering what kind of background I need. I have looked through various web pages and they...
4. ### Learning maths concepts …not just how to do an equation

I tried posting in the education section but was unable to start a topic… Anyways…I'm trying to reteach myself maths from back in the school days in hope of doing a calculus paper at university. I have realized that a lot of books and materials seem to teach you how so l've equations and...
5. ### Re-learning math (books?)

I'm in a similar situation, in that I have gone to learning maths again as an adult and while the odd piece of maths form here and there has stuck with me, I often can just plug in numbers to a formula and get an answer. ..BUT…if you asked me why it worked that way I'd be stumped and possibly...
6. ### How do derivatives provide answers for optimization problems ?

I' at a a very very very basic level of calculus and usually have to watch a video or read something basic just to understand the basics. I'm fascinated by optimization equations, for example what is the largest area that can made with 500m of fencing. So at some point in solving this we end...
7. ### Archived Help with internal moments = external moments

Homework Statement Internal moments need to equal external moments, work out the total of the internal moments. The object has a mass of 2 kg Homework Equations I have obtained the moment about I (labelled as MI) + Iα The Attempt at a Solution the moment about I (MI)...
8. ### How to find forces acting on object on a slope?

here is my latest diagram I'm now starting to think Soh Cah Toa isn't actually relevant there ? Fn = G cosσ Ft = Gσ I'm unsure where these two formulas/equations have come from and why Soh Cah Toa isn't relevant here... I must be missing something fundamental
9. ### How to find forces acting on object on a slope?

Thanks NascentOxygen. Unfortunately I dont quite get why the answers are what they are. I have drawn myself a new triangle which shows the two vector forces but I still don't understand where the answers have come from. Especially Fn = G cosσ. I thought cos in basic terms meant...
10. ### How to find forces acting on object on a slope?

edited...I'll be back
11. ### How to find forces acting on object on a slope?

Homework Statement an object is at rest on a slope at angle of σ Using trigonometry, solve the forces acting at Ft and Fn Homework Equations Soh Cah Toa The Attempt at a Solution sin σ = G/Ft sin σ /Ft = G G/ sin σ = Ft (my final answer) Book says correct answer is Ft = G sinσ...
12. ### Torque, rotational inertia and angular acceleartion

what happens though if the body isn't rotating and I want to start it rotating but can't apply enough force to do so ? I'm still applying torque though ....aren't I ?
13. ### Torque, rotational inertia and angular acceleartion

Homework Statement In order to link these into a logical sequence, how do they fit together Homework Equations I = rotational inertia a = angular acceleration (I know a different symbol is usually used) τ= force x moment arm distance The Attempt at a Solution so....to...
14. ### What is Torque and what is correct formula?

I'm struggling with the concept of torque as I read more I get further confused. I read some sources and they say torque and moments are interchangeable, yet other sources make a specific effort to keep the two separate. So question one is , what is the difference between torque and a moment...
15. ### Delta V/ delta t vs. dv/dt

I know delta means change , but I don't what the difference between Δv/Δt vs dv/dt is ? I am at the noob end of calculus so trying to grasp how to interpret things like dv/dt or what what dv would mean if it were standing alone. TIA