Learning Goal: A cyclist competes in a one-lap race around a flat, circular course of radius 140 m Starting from rest and speeding up at a constant rate throughout the race, the cyclist covers the entire course in 60 s. The mass of the bicycle (including the rider) is 76 kg. What is the magnitude of the net force Fnet acting on the bicycle as it crosses the finish line? Solve Part D Find Ff,net, the magnitude of the net force acting on the cyclist at the finish line. Express your answer in newtons to two significant figures. ► View Available Hint(s) Ff.net = Submit 15. ΑΣΦ 3 ? net N a R Top view Start/Finish Known R = 140 m At = 60 s m = 76 kg Find Fract

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**Learning Goal:**
A cyclist competes in a one-lap race around a flat, circular course of radius 140 m. Starting from rest and speeding up at a constant rate throughout the race, the cyclist covers the entire course in 60 seconds. The mass of the bicycle (including the rider) is 76 kg. What is the magnitude of the net force \( F_{\text{net}} \) acting on the bicycle as it crosses the finish line?

**Diagram Explanation:**
- The diagram is a top view of a circular track.
- The circle represents the path of the cyclist with a radius labeled \( R \).
- The starting and finishing point is marked.
- The cyclist is represented at a point on the path.
- Known values are given:
  - \( R = 140 \, \text{m} \)
  - \( \Delta t = 60 \, \text{s} \)
  - \( m = 76 \, \text{kg} \)
- A vector, \( \vec{F}_{\text{net}} \), indicates the net force direction on the cyclist.

**Solve**
- Part D: Find \( F_{t, \text{net}} \), the magnitude of the net force acting on the cyclist at the finish line. 

Express your answer in newtons to two significant figures.

\[ F_{t, \text{net}} = \boxed{?} \, \text{N} \]

- A hint can be viewed for assistance with solving.

- A calculation box is provided to input the solution.
Transcribed Image Text:**Learning Goal:** A cyclist competes in a one-lap race around a flat, circular course of radius 140 m. Starting from rest and speeding up at a constant rate throughout the race, the cyclist covers the entire course in 60 seconds. The mass of the bicycle (including the rider) is 76 kg. What is the magnitude of the net force \( F_{\text{net}} \) acting on the bicycle as it crosses the finish line? **Diagram Explanation:** - The diagram is a top view of a circular track. - The circle represents the path of the cyclist with a radius labeled \( R \). - The starting and finishing point is marked. - The cyclist is represented at a point on the path. - Known values are given: - \( R = 140 \, \text{m} \) - \( \Delta t = 60 \, \text{s} \) - \( m = 76 \, \text{kg} \) - A vector, \( \vec{F}_{\text{net}} \), indicates the net force direction on the cyclist. **Solve** - Part D: Find \( F_{t, \text{net}} \), the magnitude of the net force acting on the cyclist at the finish line. Express your answer in newtons to two significant figures. \[ F_{t, \text{net}} = \boxed{?} \, \text{N} \] - A hint can be viewed for assistance with solving. - A calculation box is provided to input the solution.
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Use the answer in part D to complete part E.

Part D
Find Ff, net, the magnitude of the net force acting on the cyclist at the finish line.
Express your answer in newtons to two significant figures.
► View Available Hint(s)
Ff,net = 470 N
Submit
Review
Part E
Hs =
Previous Answers
Correct
Correct answer is shown. Your answer 470.4 N was either rounded differently or used a different number of significant figures than required for this part.
Important: If you use this answer in later parts, use the full unrounded value in your calculations.
To review whether your calculations make sense, let's simplify the problem even further and assume air resistance is negligible. In this case, the net force acting on the bicyclist is equivalent to just the
force of static friction, and your answer to Part D is the magnitude fs. Based on this value, what is the minimum coefficient of static frictions between the race track and the bicycle?
Express your answer numerically to two significant figures.
► View Available Hint(s)
Submit
ΓΠ ΑΣΦ
?
Transcribed Image Text:Part D Find Ff, net, the magnitude of the net force acting on the cyclist at the finish line. Express your answer in newtons to two significant figures. ► View Available Hint(s) Ff,net = 470 N Submit Review Part E Hs = Previous Answers Correct Correct answer is shown. Your answer 470.4 N was either rounded differently or used a different number of significant figures than required for this part. Important: If you use this answer in later parts, use the full unrounded value in your calculations. To review whether your calculations make sense, let's simplify the problem even further and assume air resistance is negligible. In this case, the net force acting on the bicyclist is equivalent to just the force of static friction, and your answer to Part D is the magnitude fs. Based on this value, what is the minimum coefficient of static frictions between the race track and the bicycle? Express your answer numerically to two significant figures. ► View Available Hint(s) Submit ΓΠ ΑΣΦ ?
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