Recent content by starji

and thank you

yes it is 88m

oh and the answer is 0.22

Banked Curve "perfectly banked" Homework Statement if a curve with a radius of 88. is perfectly banked for a car traveling 75km/h, what must be the coefficient of static friction for a car not to skid when traveling 95km/h? Homework Equations ƩF=ma and a=v^2/r and Ff=μFnThe Attempt at a...

oh ok good call thanks i'll try it

wait what? i don't really understand where x is coming from or how that would work since i get x^2=4.9t^2 leaving me with 2 variables and no way to use the quad formula

oh ok sry here it is: d=vit+0.5at^2; d=0+0.5(9.8)t^2; d=4.9t^2

how deep is the well? (using speed of sound) Homework Statement A boy drops a penny into a deep well. if he hears the splash 5.0 seconds after he releases the penny, how deep is the well? (assume the well is 20degrees C) (also assume there is no air resistance) Homework Equations speed...

ok i give up then i'll just ask my teacher he probably forgot

and where did you get d=md^2/t^4?

thats what I am having trouble with. i know it can't be independent of the mass i just need to find a way to find the mass

these r the "challenging" questions given by my teacher so...

the mass isn't given it just says an Olympic runner there has to be a away to find it without the mass

does anyone know where the formula d=1/2ma^2 comes from? or if it's even true? because then i could find the mass

so i got acc: 2.13 and vf: 20.64 and if mad=1/2mv^2 then i can cancel out m and I am left with 213. is 213 work?