So I’ve missed the entire week of school and need some help with physics for my exam tomorrow. Anyways enough excuses, the question is this:
A vertical loop on a roller coaster has a radius of 10.0m. At what minimum speed must a car travel at the top of the loop for it to remain in contact with the track?
So if anyone is still awake and willing to help, I would greatly appreciate it. Thanks a bundle :mountie:
PS: For anyone who does attempt this, the correct answer to the problem is 9.90m/s.
Edit: Scratch that, just realized that some other equations applied to this problem, specifically:
T = 2[pi]√(l/g)
and
v=2[pi]r/T
I’ll keep this thread open in case I have some more questions
Well thatis a pretty easy question to answer. Well actually it is about 9.8ms^2 rather than 9.9.
Gravity is measured to be at a constant of 9.8 ms^2. Anything above this in an opposing direction will overcome the force of gravity. There could be many solutions past this, as you could have an incoming ramp of 1km (if u are talking about aproach length)
But it needs to be at at least 9.8 (or 9.9. if you round it off to that)
to balance out
Ahh looking at ur edit I can see ur using equations for centripetal motion eh? hahahahah have fun…
Thanks for the reply, hopefully you’ll be able to answer my new question:
A girl swings 0.5kg teddy bear on a 0.3m rope in a vertical loop with a constant period of 1s. Estimate the tension in the cord when the teddy is in its:
a) lowest position (answer: 10.8N)
b) highest position (answer: 1.01N)
I guess the real question is, what the deuce is tension? From my thinking I’m guessing it has something to do with centripetal force acting on the bear but, again, I would really appreciate some help with this
Alright, apparently I’m dumber than I look - unless I look bad in which case I would be exactly as dumb as I look and have two problems. Anyways, how would you calculate it?
rofl well that is the standard that it is usually measured. Bleh good point though heheh
Anyways, u just need to remember that the force at the bottom of the loop (assuming u move at a constant) is 9.8(or 9) more than at the top of the loop.
Plugin ur numbers into the formulae and u will get a nice answer
( I haven’t touched centripetal motion for a while)
