Recent content by megaforcetkd

ok i tried doing... .5mVo^2 + mgh1 = mgh3 i got that number smaller than my initial height?

ahhh ok i figured out part A but for some reason i can't do B... for part a i just use MAc = MG and solved for v, then used MEi = MEf an plugged that v into the equation V = sqrt(gR) and i found Vo.. Vo = 26.26 m/s or 94.54 km/h For part B i tried doing mg (delta)h = .5mv1^2 delta...

I know that but in this problem I really have no idea where to go with it.. I thought I could use the normal force and set that to 0 and do sum of forces but I can't do that since there's no mass to cancel out I think... And what does the problem mean when it says the radius of the curvature?

guys this is reallly driving me mad =/ i can't figure this out at all!

Homework Statement A frictionless roller coaster is given an initial velocity of vo at a height of h = 85 m, as in figure shown. The radius of curvature of the track at point A is 127 m. (a) Find the maximum value of vo so that the roller coaster stays on the track at point A solely...

This isn't really a homework problem I am just trying to figure out how to do it.. I've attached a really badly drawn picture of the setup... But I'll type it out here too. I have to use a steel ball as a pendulum. A razor blade is attached to a pole on the test so when the string swings...

I'm still getting it wrong using cos(0). On my last try.

In part A I got 451.56 N EDIT: Actually I inputted 451.96 but there's a 1% margin for error. I got that part right.

Gah.. Still can't get it.. I'm on my last attempt.. If I screw it up I can't input anymore..

ahhh right thanks :P. i still can't seem to get the work done by the man on the piano though.. I do W = (451.56)(4.0)cos(30)

Homework Statement A 300 kg piano slides 4.0 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40. Picture attached (a) Calculate the force exerted by the man...

Well we don't have any numbers to work with so I'm trying to figure out just formulas.. I have no idea how to go about this.. I've just started this course and I haven't learned very much to do this..

Homework Statement Apply Newton's second law to find formulas for the magnitude of the acceleration of the system and for the tension in the cord. Ignore friction and the masses of the pulley and cord. (Use only the following: m_1 for m1, m_2 for m2, and g for gravity.) a = ? T = ...

Hey guys, I'm not sure where else to post this so I'm thinking it'll fit the best here. I've been trying to burn a slideshow that my friend made in Windows Movie Maker to a DVD for her, and it's saved in .wmv format. I've converted it to a DVD format (.vob) and tried burning it, but my DVD...

YAY! Thanks for the help. Haha you can expect a lot of me though once we start getting into complicated stuff in AP Physics QQ.