# Search results

1. ### Physics Experiment Ideas Using Snowboarding

Instead of doing 'big jumps', if you could do a relatively large fall from a ledge, like a drop-off. You could do a simple projectile motion physics experiment? Even if the fall is 1m, you could measure the distance you travelled, then convert that into your various velocity components etc.
2. ### Help with kinetic energy and momentum of ball bearings.

The problem which I need help with is this, I've done an experiment in which there is a ramp. This ramp has a stationary ball bearing (B1) of mass (m) on it at a point, h. and there is another ball bearing (B2) at the lowest point of the ramp, of mass (m). Ball bearing (B1) is then released from...
3. ### Seeing if something is Dimensionally correct.

Good point! ill check that up!
4. ### Seeing if something is Dimensionally correct.

If i cancle the kg out, then i am stuck with a '2' in the final equation instead of a kg unit. because if i try cancle the 2 out by halving that side, then the other side (left hand side) gets 2 in the denominator :/
5. ### Seeing if something is Dimensionally correct.

Vt = (2mg/pA)1/2 where: Vt = Terminal Velocity (ms-1) as velocity = s/t = m/s(seconds, not distance). m = mass in kg. g = gravity in ms-2. p = fluid density in kgm-3 A = Area in m2 Show that equation is dimesionally correct. I seem to get my answer wrong on the end product; ill...
6. ### Special theory of relativity

Hello all, I just need some help understanding inertial frame of reference, is this when there is no acceleration acting on a body. such as, gravity.. but the body can be under constant velocity or at rest. Also, Could someone please help me with this senario: there is a guy in a rocket...
7. ### How do you calculate the resistance in a coil?

Hi all. I'm just wondering if it is possible to calculate the resistance in a coil without the amperage value? i've got voltage,coil-diametre, amount of turns, coils material type. The only way i think it is possible if i set a ampmetre into the circuit. is there any way? Thank you.
8. ### Making a electric motor - help!

Hi all. I'm just wondering if anyone can give me some simple plan to make an electric motor? The materials i have atm are: 2 x Perm magnets 2 x batteries 2 x aligator clips 2 x stands for the coil/armature to sit in 1 x various tools. I need to be able to attach a string to the...
9. ### Coefficient friction of a book resting on a block

i measured the mass of the book to be 0.109kg :)
10. ### Coefficient friction of a book resting on a block

It's homework, i forgot to add that i have to push the book from the base until the book slipped and when i did the horizontal distance was 15.3cm nd the equation is coefficeint = N/F
11. ### Coefficient friction of a book resting on a block

Hi. Im just wondering if I was going to attempt to find the coefficient friction of a book resting on a block off wood. How would I go about it? http://yfrog.com/5gblockofwoodj The horizontal distance is 15cm and the vertical distance is 6cm. Would i just do trigonometry to find the...

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14. ### Finding the mass of the sun from T^2/R^3

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16. ### Gravitations! need help with formula

2. Using your knowledge of circular motion and gravitation, derive an equation that shows the relationship between the orbital period (T) of a planet in a circular orbit and the radius of the planetary orbit (R). 4pi^2/GM = T^2/r^3 39.478/ 3.247E+14 = 1.08E+11/ 7.474E+21 1.215E-13 = 1.445E-11...

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18. ### Loops the loop! need help

Oops. there is an identical question to this, forgot different Velocity. so we would substitute 200ms into it instead of (800/3.6) so we'd end up getting.. ~1020m :)
19. ### Loops the loop! need help

my bad _wolfgang_ thats for bottom ;D
20. ### Loops the loop! need help

Fc = R - W Therefore mv^2r/r = 5mg - mg So, mv^2/r = 4mg, mass cancles. v^2/r = 4g, r = v^2/4g so (800/3.6)^2 / (4*9.8) = r , so r = ~1260m. ??
21. ### Loops the loop! need help

pretty sure fc is negative also R is negative but W is positive. so... -Fc = -R + W or.. sign conversion or wtv makes it Fc = R - W i think..
22. ### Loops the loop! need help

6mg = mv^2/r dont you mean?
23. ### Loops the loop! need help

Holezch, this is my question.. lol
24. ### Loops the loop! need help

That's what i meant sorry, wouldn't that be like: F = 5*(mg) ? but then 2nd law says that if the force is 5 times as much, the acceleration will be directly proportional, therefore 5 times as great. So i thought that becase mv2/r = 5*mg and mass cancles out, so, v2/r = 5*g therefore r = v2/5*g ...
25. ### Loops the loop! need help

Hey inutard, Thanks for the information on the max Nforce, didnt know that! Okay, because the question states that the max force is 5times the pilots mass i would have thought that it means that the normal force is 5 times greater, and what this means to ME is that it is 5g's. therefore when...
26. ### Loops the loop! need help

It's a vertical circle
27. ### Loops the loop! need help

Also, does this mean that 5g's will be affecting the pilot?
28. ### Loops the loop! need help

okay ill give that a go, thanks alot
29. ### Ball thrown off building

Try using some of the extra forumlas given for projectile motion, you can find them on wikipedia ect. they help alot, plus they're easier to use then 2D motion
30. ### Hardest question ever

I wouldn't have thought you'd need so much working out for a multiple choice question, that would basically take alot of your short/long answer questions time away ;l