Coefficient of friction question.

AI Thread Summary
The discussion revolves around calculating the coefficient of friction on a wet racetrack, given a maximum safe speed of 77 km/hr and a radius of curvature of 53 m. The relevant equation used is (gravity)*(coefficient) = (v^2)/r, with the speed converted to 21.39 m/s. A participant initially calculated the coefficient as 0.8488 but realized they mistakenly used the wrong radius of 55 meters instead of the correct 53 meters. This error led to confusion, highlighting the importance of accurate data in physics calculations. The discussion emphasizes the need for careful attention to detail in problem-solving.
JohnnyB212
Messages
14
Reaction score
0

Homework Statement



On a wet racetrack, the maximum safe speed, to avoid sliding on a level circular curve with a radius of curvature of 53 m, is 77 km/hr. What is the coefficient of friction between the car's tires and the track surface?

Homework Equations



(gravity)*(coefficient) = (v^2)/r

V= 21.39 m/s (after changing 77 km/hr into m/s)
Radius= 55 meters


The Attempt at a Solution



I kept getting the same answer .8488, but it keeps telling me I'm wrong? Help please!
 
Physics news on Phys.org
Cancel that, Stupid me plugged in the wrong radius into the equation, my mistake! Sorry!
 
JohnnyB212 said:
...on a level circular curve with a radius of curvature of 53 m

JohnnyB212 said:
Radius= 55 meters

There is a discrepancy here.
 
cepheid said:
There is a discrepancy here.


Yep, I just caught this! My mistake. :frown:
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanged mass'

Thread 'A cylinder connected to a hanged mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Coefficient of Friction question for a cart going down a wooden ramp
Replies
18
Views
3K
How to find coefficient of friction *Without* mass?
Replies
3
Views
22K
Banked Curve-Determine smallest static coefficient of friction
Replies
9
Views
4K
How do i find the coefficient of static friction?
Replies
2
Views
2K
What's the coefficient of kinetic friction?
Replies
8
Views
3K
How to find the coefficient of kinetic friction
Replies
4
Views
3K
Need to calculate the friction coefficient
Replies
20
Views
2K
Find friction coefficient given initial and final velocity
Replies
3
Views
3K
Find the velocity given coefficient of friction and radius?
Replies
1
Views
2K
Finding friction coefficient, car unbanked curve.
Replies
3
Views
3K

Hot Threads

Recent Insights

Back
Top