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...
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.
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...
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...
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...
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...
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)...
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
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...
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...
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 ?
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...
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...
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
This may be the wrong section , but I figure it was education relevant.
In class I can't always keep up with the current lecture, but then when it starts incorporating previous lectures and the principles I can find it even harder to keep up. I notice some students can start to piece it...
Homework Statement
Given a graph with distance (in meters) on the y axis and time (in seconds) on the x axis what does the area under this graph illustrate ?
The object has a velocity of 1m/s so after 5 s it has travelled 5m.
Homework Equations
This is a linear line (i.e y=x) so the area...
Thanks for the help with this.....much appreciated.
Still trying to get my head around the F=m*a is equivalent to W= m*g statement. So this is not true then (in the case where I am standing still on the footpath)
If I am not accelerating to the center of the earth due to the force of the...
Homework Statement
Why is gravity still 9.81m/s/s when we are standing still ? and why do I have a weight when I am standing still ?
Homework Equations
F=m*a
W=m * g
a= (final velocity - initial velocity)/ time
The Attempt at a Solution
So it requires more of a theory...
although I dont understand the question properly , they did say in ithe question the skater does 300J of work, so it looks liek you'd be on the right track rcgld "By my math, the skater does about 296.37728 J of work."
I just have no ideas if my answers are on the right path or not.
Homework Statement
A 60kg ice skater is spinning around at 300 degrees per second. His radius of gyration is .5m. As he pulls his arms in he does 300 J of work.
i.What is his initial kinetic energy?
ii.What is his final kinetic energy ?
iii.Assuming that his new radius of gyration is .32m...
Homework Statement
A male and female pair of dancers start dancing when the male lifts the female and throws her into the air. The female's mass is 40kg . The male exerts an average vertical force of 500n for 1.0s on the female.
What is her vertical velocity when she is released into the air...
ohh I'm definitely confused....
oli4 makes mention of the fact that if I submerge an object in freshwater or seawater then the volume displaced will be identical. I believe this is due to the fact that the object has been submerged.
I guess it's different in the case of a boat floating ? In...
Homework Statement
I'm doing a problem that is likely a common one. It is comparing the buoyant force of an object in seawater to that of the same object in freshwater. which has more buoyant force acting on it?
Homework Equations
not sure of equations at this stage, and we are just...
hmmm I dont quite get what would make the box slide ? If ƩF=0 and there's no friction my guess would be there is no force...but then I don't get how the box would be sliding with no force on it
Homework Statement
if the equilibrium rule states ƩF=0N, how can something move or be moving at a constant speed ? eg I push on a box with 50N and friction provides 50N back, resulting in ƩF=0N. So I am not providing more N than the box is resisting with. I thought something could only be...
Homework Statement
If the horizontal velocity remains the same, whether angled or not, I dont quite understand why we bother launching projectiles upwards on an angle?
Would it be better just to launch them horizontally ?
Homework Equations
d= 1/2gt^2....I think?
The Attempt at...