Urgent!! Formulas in test!! (1 Viewer)

[Kukudas]

Hey guys..
got my mid course exam tommorow-_-

and i wanna know something.. very urgent!

u know if u look at syllabus..
some points says
-solve problems .... using v=u+at for example ^^

u know there are lots of formulas
like a=t-mg/m centripetal force formula etc...
but syllabus point doesnt ask you to solve problems using this formula

so it's not going to be tested???

PLZ!!

 

[watatank]

If its not in the syllabus it won't be in the test. Pretty much all the formulas you need will be on a formulas sheet.

Good luck! :wave:

 

[Kukudas]

thx ^^

 

[morganforrest]

But be careful with that...they sometimes ask questions using formulas that aren't specifically on the data sheet but that can be derived by mixing equations and stuff. Remember the 5 equations of motion though, it saves a heap of time than looking in the back. Basically anything you use a fair bit and thats not specifically written in the data sheet I'd keep in the back of my mind or learn how to derive.

 

[helper]

The a= equation is a modified version based on F=ma. It could be examined as you are supposed to be able to analyse the changing acceleration of a rocket during launch in terms of the:
– Law of Conservation of Momentum
– forces experienced by astronauts

 

[ThomasF]

never mind. Will edit later

 

[Zozo6969]

need to be able to derive escape velocity (GPE = -Ek) and orbital velocity (centripetal force = gravitational force). Use the formulae on the sheet 4 these.

Also must be able to derive keplers law of periods, where orbital velocity = d/t (2pi*r/t)

 

[ThomasF]

need to be able to derive escape velocity (GPE = -Ek) and orbital velocity (centripetal force = gravitational force). Use the formulae on the sheet 4 these.

Also must be able to derive keplers law of periods, where orbital velocity = d/t (2pi*r/t)

I read that the escape velocity formula is not part of the syllabus

It is this formula_____________________________________
[FONT=&quot]Escape Velocity =[/FONT]√[FONT=&quot][(2 (6.672 x 10 ¯¹¹)(Mass of planet in KG)) / (Radius of planet)]

Correct? (You have no idea how hard it was to find the square root symbol)
[/FONT]

 

[helper]

I read that the escape velocity formula is not part of the syllabus

It is this formula_____________________________________
[FONT=&quot]Escape Velocity =[/FONT]√[FONT=&quot][(2 (6.672 x 10 ¯¹¹)(Mass of planet in KG)) / (Radius of planet)]

Correct? (You have no idea how hard it was to find the square root symbol)
[/FONT]

You need to look at the syllabus and understand

 explain the concept of escape velocity in terms of the:
– gravitational constant
– mass and radius of the planet

So to explain escape velocity, you need to define escape velocity and then from there develop the equation for escape velocity.

Remembering the formula in most cases will be enough but if they want to they could ask you to derive it.
As a explanation is required they do not provide the formula.

 

[watatank]

Escape velocity formula itself is not part of the syllabus but you have to know how its derived, that part IS in the syllabus.