Each Car has Speed Corresponding to Max Normal Acceleration. Find Time Elasped

AI Thread Summary
Two cars, A and B, enter a turn with a maximum normal acceleration of 0.94g, and the goal is to find the elapsed time for each car between crossings of line C-C. The acceleration can be calculated as 9.2214 m/s², and the relationship between speed, radius, and angular velocity is crucial for solving the problem. The discussion suggests using the formula V²/r = a to determine each car's speed and then calculating the time taken to travel the turn's distance. The final step involves finding the relative position of the two cars as the second car exits the turn. The approach emphasizes understanding the physics of circular motion and the differences in distance traveled by each vehicle.
Northbysouth
Messages
241
Reaction score
2

Homework Statement


The two cars A and B enter an unbanked and level turn. They cross line C-C simultaneously, and each car has the speed corresponding to a maximum normal acceleration of 0.94g in the turn. Determine the elapsed time for each car between its two crossings of line C-C. What is the relative position of the two cars as the second car exits the turn? Assume no speed changes throughout.

I have attached an image of the question.

Homework Equations



an = v2/ρ = rθ'2 = vθ'

v = rθ'



The Attempt at a Solution



I' honestly not sure how to start this one. I know an = 0.94g = 9.2214 m/s2

I was thinking of something along the lines:

v = rθ' = r dθ/dt

∫v dt = ∫r dθ

vt = rθ

t = rθ/v

I'm not sure if what I have here makes sense. But if it does, could I substitute v for ds/dt, where ds/dt would be the circumference of the half circle?

Honestly,I'm not sure if what I have makes sense. Any input/feedback would be greatly appreciated.
 

Attachments

  • dyn 2.104.png
    dyn 2.104.png
    23.4 KB · Views: 700
Last edited:
Physics news on Phys.org
Determine the speed of each vehicle from the formula V^2/r=a. Knowing the speed of each, determine the elapsed time for each vehicle to travel the distance realizing the distances differ. Then determine distance between vehicles.
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
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...
Thread 'A cylinder connected to a hanging 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...
Back
Top