How Fast is the Roller Coaster Car at the Top of the Hill?

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SUMMARY

The discussion focuses on calculating the speed of a roller coaster car at the top of a 10-meter radius hill, where its apparent weight is half its true weight. The relevant equations include centripetal acceleration (A = v²/r) and Newton's second law (F = ma). Participants clarify that the weight cancels out in the calculations, allowing for a solution without needing its specific value. The key takeaway is that understanding the relationship between apparent weight and centripetal force is crucial for solving this problem.

PREREQUISITES
  • Understanding of centripetal acceleration (A = v²/r)
  • Familiarity with Newton's second law (F = ma)
  • Basic knowledge of forces and weight in physics
  • Ability to manipulate algebraic equations
NEXT STEPS
  • Study the derivation of centripetal acceleration formulas
  • Explore the concept of apparent weight in circular motion
  • Learn about forces acting on objects in vertical circular motion
  • Practice solving problems involving forces and acceleration in physics
USEFUL FOR

Students studying physics, particularly those focusing on mechanics and circular motion, as well as educators looking for examples of real-world applications of physics concepts.

hbteen
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Homework Statement



As a roller coaster car crosses on the top of a 10 m radius hill (the track is underneath the car), its apparent weight is one-half its true weight. What is the car's speed at the top?


Homework Equations




A=v^2/r
F=ma

The Attempt at a Solution



I tried saying the weight was .5 and solving for velocity, but I still have a missing # for the Force variable.
Where do I go from there?
 
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Welcome to PF!

Hi hbteen! Welcome to PF! :smile:
hbteen said:
As a roller coaster car crosses on the top of a 10 m radius hill (the track is underneath the car), its apparent weight is one-half its true weight. What is the car's speed at the top?

A=v^2/r
F=ma

I tried saying the weight was .5 and solving for velocity, but I still have a missing # for the Force variable.

The weight doesn't matter … it cancels out. :wink:

Show us what you tried, and then we'll see where the problem is. :smile:
 

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