Recent content by Coronita

if anyone answers plese send it to me as a message, I am off to work now

i have 2 physics quizzes this week and it would be the week my tutor's going to be out of town >_<

1. You push a 100g object across a table and release it 2 m from the edge. The object slides across, sails off the edge falls 1m to the floor and lands 30 cm from the edge of the table. If the coefficient of friction is 0.5 what was the object's speed as you released it? 2. f=ma...

I have to be somewhere in 20 minutes >_< Thank you so much for your patience though! I'll have to come back to this one later.

Gravity must still be greater than the centripetal force. So we're looking for the point at which centripetal force is the closest it can get to Fc without surpassing it?

Thanks! You're right on that one but now I get 89.8 degrees :P

mg/cos(theta)*sin(theta)=mv^2/r mg sin(theta)/cos(theta)=m(90^2)/500 10tan(theta)=8100/500 tan(theta)=162 theta=arctan 162 theta=89.6

I've read through this section of the chatper a few times but I'm still not understanding why it's true

I've found the equation for critical speed inside of a circle, Vc=rg^1/2 is it related to that at all?

kinetic friction, normal and gravity

A highway curve of radius 500m is designed for traffic moving 90 km/hr. What is the correct banking angle of the road? I made a force diagram and wrote out the sums of the forces in the x and y then tried to solve for theta I got: sumFx= -nsin theta=ma=mv^2/r and sumFy=...

? :(

k, best I've got is F=mv^2/r but I don't know the mass of the car, I can't just consider it to be mass-less can I?

I've been looking through the chapter on circular motion but all I've got are the rotational kinematic equations, I struggled with that chapter when we covered it too and that was 4 chapters ago >_<

it's not 2pi r/t is it?